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NSR database version of March 2, 2024.

Search: Author = B.A.Brown

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2023AY02      Phys.Rev. C 107, 044314 (2023)

A.D.Ayangeakaa, R.V.F.Janssens, S.Zhu, J.M.Allmond, B.A.Brown, C.Y.Wu, M.Albers, K.Auranen, B.Bucher, M.P.Carpenter, P.Chowdhury, D.Cline, H.L.Crawford, P.Fallon, A.M.Forney, A.Gade, D.J.Hartley, A.B.Hayes, J.Henderson, F.G.Kondev, Krishichayan, T.Lauritsen, J.Li, D.Little, A.O.Macchiavelli, D.Rhodes, D.Seweryniak, S.M.Stolze, W.B.Walters, J.Wu

Triaxiality and the nature of low-energy excitations in 76Ge

NUCLEAR REACTIONS 208Pb(76Ge, 76Ge'), E=291, 304, 317 MeV; measured Eγ, Iγ, (76Ge)γ-coin using the GRETINA array with 28 Ge crystals in one experiment at 304-MeV beam energy, and 42 Ge crystals in a second experiment at 291- and 317-MeV beam energies, both in coincidence with scattered particles detected by using the CHICO2 array of position-sensitive parallel plate avalanche counters at the ATLAS-ANL facility. 76Ge; deduced levels, Jπ, γ-ray and Coulomb excitation yields analyzed by using the semiclassical, coupled-channel, Coulomb excitation least-squares code GOSIA, constrained by certain previouly known experimental nuclear structure parameters, E2, M1, E1 and E3 matrix elements, B(E2), B(M1), B(E1) and B(E3), spectroscopic quadrupole moments for five excited states, and evidence for rigid triaxial deformation at low excitation energies in 76Ge, and magnitudes of the quadrupole invariants Q+2, and expectation values of the quadrupole asymmetry parameters cos(3γ) for the members of the ground-state and the γ bands. Comparison with configuration interaction shell-model calculations and generalized triaxial rotor model, and with previous experimental data.

doi: 10.1103/PhysRevC.107.044314
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2023BE26      Phys.Rev. C 108, L061301 (2023)

T.Beck, A.Gade, B.A.Brown, J.A.Tostevin, D.Weisshaar, D.Bazin, K.W.Brown, R.J.Charity, P.J.Farris, S.A.Gillespie, A.M.Hill, J.Li, B.Longfellow, W.Reviol, D.Rhodes

Probing proton cross-shell excitations through the two-neutron removal from 38Ca

doi: 10.1103/PhysRevC.108.L061301
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2023DR01      Phys.Rev. C 107, 034306 (2023)

N.Dronchi, D.Weisshaar, B.A.Brown, A.Gade, R.J.Charity, L.G.Sobotka, K.W.Brown, W.Reviol, D.Bazin, P.J.Farris, A.M.Hill, J.Li, B.Longfellow, D.Rhodes, S.N.Paneru, S.A.Gillespie, A.Anthony, E.Rubino, S.Biswas

Measurement of the B(E2 ↑) strengths of 36Ca and 38Ca

NUCLEAR REACTIONS 197Au(36Ca, 36Ca), E=76.9 MeV/nucleon; 197Au(38Ca, 38Ca), E=69.1 MeV/nucleon; 197Au(34Ar, 34Ar), E not given; measured reaction products, Eγ, Iγ; deduced σ and B(E2) for the excitation of the first 2+ (34Ar was present as contamination). 36Ca; deduced proton decay branching ratio for 2 state proton unbound state, spectroscopic factors, charge radii difference with mirror nuclei 36S. 35K(p, γ), T=0.5-2 GK; deduced reaction rate using obtained in this paper values for the 36Ca B(E2) and proton branching ratio. GRETINA HPGe array and the S800 spectrograph used to measure the γ-decay following Coulomb excitation. CAESAR CsI(Na) array and the S800 spectrograph used to measure the p/γ- branching ratio in 36Ca. Systematics of first 2+ states energy and B(E2) for Ca isotopes. Beam produced from fragmentation reaction 9Be(40Ca, X), E=140 MeV/nucleon at Coupled Cyclotron Facility (NSCL).

NUCLEAR STRUCTURE 36,38,40,42,44,46,48,50Ca, 36S, 38Ar; calculated energy of first 2+ state, B(E2) for the excitation of first 2+ state. Shell model calculations with ZBM2, USDB, spdfu-mix and GXPF1A interactions. Comparison to experimental data.

doi: 10.1103/PhysRevC.107.034306
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Data from this article have been entered in the XUNDL database. For more information, click here.


2023GI06      Phys.Rev.Lett. 130, 232301 (2023)

S.Giraud, J.C.Zamora, R.G.T.Zegers, D.Bazin, Y.Ayyad, S.Bacca, S.Beceiro Novo, B.A.Brown, A.Carls, J.Chen, M.Cortesi, M.DeNudt, G.Hagen, C.Hultquist, C.Maher, W.Mittig, F.Ndayisabye, S.Noji, S.J.Novario, J.Pereira, Z.Rahman, J.Schmitt, M.Serikow, L.J.Sun, J.Surbrook, N.Watwood, T.Wheeler

β+ Gamow-Teller Strengths from Unstable 14O via the (d, 2He) Reaction in Inverse Kinematics

NUCLEAR REACTIONS 2H(14O, 2He), E=105 MeV/nucleon; measured reaction products. 14O; deduced σ(θ), B(GT) or Gamow-Teller transition strength. Comparison with available data. The Coupled Cyclotron Facility at the National Superconducting Cyclotron Laboratory (NSCL), MSU.

doi: 10.1103/PhysRevLett.130.232301
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2023JO08      Phys.Rev. C 108, 024315 (2023)

S.R.Johnson, R.V.F.Janssens, U.Friman-Gayer, B.A.Brown, B.P.Crider, S.W.Finch, Krishichayan, D.R.Little, S.Mukhopadhyay, E.E.Peters, A.P.D.Ramirez, J.A.Silano, A.P.Tonchev, W.Tornow, S.W.Yates

Testing shell-model interactions at high excitation energy and low spin: Nuclear resonance fluorescence in 74Ge

NUCLEAR REACTIONS 74Ge(polarized γ, γ'), E=3.1-5.44 MeV; measured Eγ, Iγ, γ(θ); deduced integrated exclusive scattering σ(E). 74Ge; deduced levels, J, π, branching ratios, transition intensities. Comparison to large-scale shell-model calculations with jj44b and JUN45 effective interactions. γ3-setup consisting of 6 HPGe detectors. Quasi-monoenergetic linearly polarized photon beams produced via Compton backscattering and provided by the High Intensity Gamma-Ray Source at TUNL.

doi: 10.1103/PhysRevC.108.024315
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2023LA09      Phys.Rev.Lett. 131, 092501 (2023)

L.Lalanne, O.Sorlin, A.Poves, M.Assie, F.Hammache, S.Koyama, D.Suzuki, F.Flavigny, V.Girard Alcindor, A.Lemasson, A.Matta, T.Roger, D.Beaumel, Y.Blumenfeld, B.A.Brown, F.De Oliveira Santos, F.Delaunay, N.de Sereville, S.Franchoo, J.Gibelin, J.Guillot, O.Kamalou, N.Kitamura, V.Lapoux, B.Mauss, P.Morfouace, J.Pancin, T.Y.Saito, C.Stodel, J.C.Thomas

N = 16 Magicity Revealed at the Proton Drip Line through the Study of 35Ca

NUCLEAR REACTIONS 1H(37Ca, t)35Ca, E=50 MeV/nucleon; measured reaction products; deduced atomic mass and first excited state energy, N=16 gap. Comparison with the state-of-the-art shell model calculations. The liquid hydrogen target CRYPTA, the LISE spectrometer at GANIL.

doi: 10.1103/PhysRevLett.131.092501
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2023LO02      Phys.Rev. C 107, 014620 (2023)

B.Longfellow, A.Gade, D.Bazin, P.C.Bender, M.Bowry, B.A.Brown, B.Elman, E.Lunderberg, D.Rhodes, M.Spieker, D.Weisshaar, S.J.Williams

Relative population of states in 21Mg from few-nucleon removal reactions

NUCLEAR REACTIONS 9Be(24Mg, X)21Mg, E=95 MeV/nucleon; 9Be(25Al, )21Mg, E=102 MeV/nucleon; 9Be(26Si, X)21Mg, E=95 MeV/nucleon; measured Eγ, Iγ, γγ-coin; deduced parallel momentum distribution of the 21Mg reaction product, correlation between the ratio of the population of levels in 21Mg produced from 26Si to the population of levels in 21Mg produced from 25Al. 9Be(24Mg, X)21Mg, E=95 MeV/nucleon; deduced σ for three-neutron removal. 21Mg; deduced levels, J, π, γ-ray transition relative intensities. 9Be(25Al, X)22Mg, E=67 MeV/nucleon; 9Be(26Si, X)22Mg, E=72 MeV/nucleon; analyzed experimental Eγ, Iγ, from 2008GA10 Phys.Rev. C 77, 044306; deduced parallel momentum distributions for 22Mg reaction product, ratio of the population of levels in 22Mg produced from 26Si to the population of levels in 22Mg produced from 25Al as function of the spin. Observed unexpected strong correlation between the relative population of the states in 21Mg and the spin of the populated level in reactions caused be 25Al and 26Si. Comparison to shell-model calculations using the USDB Hamiltonian. CAESium-iodide scintillator ARray (CAESAR) consisting of 192 CsI(Na) scintillators and S800 magnetic spectrograph at Coupled Cyclotron Facility (NSCL).

doi: 10.1103/PhysRevC.107.014620
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2023MO04      Phys.Lett. B 838, 137675 (2023)

L.Morrison, K.Hadynska-Klek, Zs.Podolyak, L.P.Gaffney, M.Zielinska, B.A.Brown, H.Grawe, P.D.Stevenson, T.Berry, A.Boukhari, M.Brunet, R.Canavan, R.Catherall, J.Cederkall, S.J.Colosimo, J.G.Cubiss, H.De Witte, D.T.Doherty, Ch.Fransen, G.Georgiev, E.Giannopoulos, M.Gorska, H.Hess, L.Kaya, T.Kroll, N.Lalovic, B.Marsh, Y.Martinez Palenzuela, G.O'Neill, J.Pakarinen, J.P.Ramos, P.Reiter, J.A.Rodriguez, D.Rosiak, S.Rothe, M.Rudigier, M.Siciliano, E.C.Simpson, J.Snall, P.Spagnoletti, S.Thiel, N.Warr, F.Wenander, R.Zidarova

Quadrupole and octupole collectivity in the semi-magic nucleus 20680Hg126

NUCLEAR REACTIONS 94Mo, 104Pd(206Hg, 206Hg'), E=4.195 MeV/nucleon; measured reaction products, Eγ, Iγ. 206Hg; deduced γ-ray energies, B(E2), B(E3). Comparison with shell model predictions, systematics. The HIE-ISOLDE facility at CERN.

doi: 10.1016/j.physletb.2023.137675
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2023OG04      Phys.Rev. C 108, 034304 (2023)

T.H.Ogunbeku, B.P.Crider, S.N.Liddick, B.A.Brown, A.Chester, K.L.Childers, P.Chowdhury, E.Lamere, R.Lewis, B.Longfellow, R.S.Lubna, S.Lyons, S.K.Neupane, D.Perez-Loureiro, C.J.Prokop, A.L.Richard, U.Silwal, D.P.Siwakoti, D.C.Smith, M.K.Smith, Y.Xiao

First half-life measurement of a low-lying isomer in 37Si

doi: 10.1103/PhysRevC.108.034304
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2023OR01      Phys.Rev. C 108, 044309 (2023)

J.N.Orce, C.Ngwetsheni, B.A.Brown

Global trends of the electric dipole polarizability from shell-model calculations

doi: 10.1103/PhysRevC.108.044309
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2023PA08      Phys.Rev.Lett. 130, 122503 (2023)

T.Palazzo, A.J.Mitchell, G.J.Lane, A.E.Stuchbery, B.A.Brown, M.W.Reed, A.Akber, B.J.Coombes, J.T.H.Dowie, T.K.Eriksen, M.S.M.Gerathy, T.Kibedi, T.Tornyi, M.O.de Vries

Direct Measurement of Hexacontatetrapole, E6 γ Decay from 53mFe

RADIOACTIVITY 53Fe(IT) [from 51V(6Li, 4n), E=50 MeV]; measured decay products, Eγ, Iγ; deduced γ-ray energies and relative intensities, transition multipolarities, B(Eλ), a discrete, hexacontatetrapole (E6) transition. Comparison with shell model calculations performed in the full fp model space. The CAESAR array of Compton-suppressed High-Purity Germanium (HPGe) detector, the Heavy Ion Accelerator Facility at the Australian National University.

doi: 10.1103/PhysRevLett.130.122503
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Data from this article have been entered in the XUNDL database. For more information, click here.


2023PO05      Phys.Rev.Lett. 130, 172501 (2023)

T.Pohl, Y.L.Sun, A.Obertelli, J.Lee, M.Gomez-Ramos, K.Ogata, K.Yoshida, B.S.Cai, C.X.Yuan, B.A.Brown, H.Baba, D.Beaumel, A.Corsi, J.Gao, J.Gibelin, A.Gillibert, K.I.Hahn, T.Isobe, D.Kim, Y.Kondo, T.Kobayashi, Y.Kubota, P.Li, P.Liang, H.N.Liu, J.Liu, T.Lokotko, F.M.Marques, Y.Matsuda, T.Motobayashi, T.Nakamura, N.A.Orr, H.Otsu, V.Panin, S.Y.Park, S.Sakaguchi, M.Sasano, H.Sato, H.Sakurai, Y.Shimizu, A.I.Stefanescu, L.Stuhl, D.Suzuki, Y.Togano, D.Tudor, T.Uesaka, H.Wang, X.Xu, Z.H.Yang, K.Yoneda, J.Zenihiro

Multiple Mechanisms in Proton-Induced Nucleon Removal at ∼ 100 MeV/Nucleon

NUCLEAR REACTIONS 1H(14O, X), E ∼ 100 MeV/nucleon; measured reaction products. 13N, 13O; deduced inclusive σ and parallel momentum distributions for proton-induced single proton- and neutron-removal reactions from the neutron-deficient 14O nucleus with large Fermi-surface asymmetry. Comparison with he state-of-the-art reaction models, with nuclear structure inputs from many-body shell-model calculations.

doi: 10.1103/PhysRevLett.130.172501
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2750.


2023RE02      Phys.Lett. B 838, 137704 (2023)

A.Revel, J.Wu, H.Iwasaki, J.Ash, D.Bazin, B.A.Brown, J.Chen, R.Elder, P.Farris, A.Gade, M.Grinder, N.Kobayashi, J.Li, B.Longfellow, T.Mijatovic, J.Pereira, A.Poves, A.Sanchez, N.Shimizu, M.Spieker, Y.Utsuno, D.Weisshaar

Large collectivity in 29Ne at the boundary of the island of inversion

NUCLEAR REACTIONS 181Ta, 9Be(29Ne, 29Ne'), E=101 MeV/nucleon; measured reaction products, Eγ, Iγ. 29Ne; deduced γ-ray energies, partial level scheme, B(E2). Comparison with shell-model calculations using FSU, SDPF-M, SDPF-U-MIX and EEdf1 interactions. The GRETINA array, the TRIPLEX device, the S800 Spectrograph facilitates at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University.

doi: 10.1016/j.physletb.2023.137704
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2023RE09      Phys.Rev.Lett. 131, 052501 (2023)

B.M.Rebeiro, S.Triambak, P.E.Garrett, G.C.Ball, B.A.Brown, J.Menendez, B.Romeo, P.Adsley, B.G.Lenardo, R.Lindsay, V.Bildstein, C.Burbadge, R.Coleman, A.Diaz Varela, R.Dubey, T.Faestermann, R.Hertenberger, M.Kamil, K.G.Leach, C.Natzke, J.C.Nzobadila Ondze, A.Radich, E.Rand, H.-F.Wirth

138Ba(d, α) Study of States in 136Cs: Implications for New Physics Searches with Xenon Detectors

NUCLEAR REACTIONS 138Ba(d, α), E=22 MeV; measured reaction products, Eα, Iα; deduced energy levels, J, π, σ(θ), partial level scheme. Comparison with the shell-model results obtained with the GCN5082, SN100PN, and QX effective interactions. The Maier-Leibnitz Laboratorium in Garching, Germany.

doi: 10.1103/PhysRevLett.131.052501
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Data from this article have been entered in the XUNDL database. For more information, click here.


2023SU03      Phys.Lett. B 839, 137801 (2023)

L.J.Sun, C.Fry, B.Davids, N.Esker, C.Wrede, M.Alcorta, S.Bhattacharjee, M.Bowry, B.A.Brown, T.Budner, R.Caballero-Folch, L.Evitts, M.Friedman, A.B.Garnsworthy, B.E.Glassman, G.Hackman, J.Henderson, O.S.Kirsebom, J.Lighthall, P.Machule, J.Measures, M.Moukaddam, J.Park, C.Pearson, D.Perez-Loureiro, C.Ruiz, P.Ruotsalainen, J.Smallcombe, J.K.Smith, D.Southall, J.Surbrook, L.E.Weghorn, M.Williams

First application of Markov chain Monte Carlo-based Bayesian data analysis to the Doppler-shift attenuation method

NUCLEAR REACTIONS 3He(32S, α)31S, E=128 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, levels, T1/2, resonances. Comparison with the shell-model code NuShellX calculations. Modern Markov chain Monte Carlo-based Bayesian statistical techniques. The Doppler Shift Lifetimes (DSL2) facility at the TRIUMF Isotope Separator and Accelerator (ISAC-II) facility.

doi: 10.1016/j.physletb.2023.137801
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Data from this article have been entered in the XUNDL database. For more information, click here.


2022BR10      Phys.Rev. C 106, L011304 (2022)

B.A.Brown, K.Minamisono

β2 corrections to spherical energy-density functional calculations for root-mean-square charge radii

NUCLEAR STRUCTURE 40,41,42,43,44,45,46,47,48,49,50Ca, 108,110,112,114,116,118,120,122,124,126,128Sn, 106,108,110,112,114,116,118,120,122,124,126Cd; calculated rms charge radii and isotonic shift between the charge radii of tin and cadmium isotopes, B(E2) using spherical density-functional-theory (DFT) with the Sv-min and Fy(Δr) energy-density functionals (EDFs), and corrected for quadrupole deformations β22. Comparison with other theoretical calculations, and with experimental data.

doi: 10.1103/PhysRevC.106.L011304
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2022BU14      Phys.Rev.Lett. 128, 182701 (2022)

T.Budner, M.Friedman, C.Wrede, B.A.Brown, J.Jose, D.Perez-Loureiro, L.J.Sun, J.Surbrook, Y.Ayyad, D.W.Bardayan, K.Chae, A.A.Chen, K.A.Chipps, M.Cortesi, B.Glassman, M.R.Hall, M.Janasik, J.Liang, P.O'Malley, E.Pollacco, A.Psaltis, J.Stomps, T.Wheeler

Constraining the 30P(p, γ)31S Reaction Rate in ONe Novae via the Weak, Low-Energy, β-Delayed Proton Decay of 31Cl

RADIOACTIVITY 31Cl(β+p) [from 9Be(36Ar, X), E=150 MeV/nucleon]; measured decay products, Eβ, Iβ, Ep, Ip; deduced β-delayed proton spectra, the weakest β-delayed proton intensity ever measured, resonance parameters, astrophysical reaction rates. The Gaseous Detector with Germanium Tagging (GADGET), the Coupled Cyclotron Facility at MSU.

doi: 10.1103/PhysRevLett.128.182701
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2022CH09      Phys.Rev. C 105, 024319 (2022)

A.Chester, B.A.Brown, S.P.Burcher, M.P.Carpenter, J.J.Carroll, C.J.Chiara, P.A.Copp, B.P.Crider, J.T.Harke, D.E.M.Hoff, K.Kolos, S.N.Liddick, B.Longfellow, M.J.Mogannam, T.H.Ogunbeku, C.J.Prokop, D.Rhodes, A.L.Richard, O.A.Shehu, A.S.Tamashiro, R.Unz, Y.Xiao

Half-life measurement of the 199-keV isomeric state in 76Ga

RADIOACTIVITY 76Zn(β-)[from 76Cu β- formed in 9Be(86Kr, X), E=140 MeV/nucleon]; 76Ga(IT)[from 76Zn(β-)]; measured Eβ, Iβ, Eγ, Iγ, βγ-coin. 76Ga; deduced levels J, π, transition strength, T1/2 of the 199-keV isomeric transition from time difference between pulses produced by β-decay populating the isomeric state and γ from the decay of the isomer. Systematics of low-lying levels in 72,74,76,78,80Ga. Beam implantation in CeBr detector (NSCL-MSU ).

NUCLEAR STRUCTURE 76Ga; calculated levels, J, π, transition strength. Shell model calculations in the jj44 model space with the jun45, jj44b, and jj44c Hamiltonians.

doi: 10.1103/PhysRevC.105.024319
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2022CR04      Phys.Rev. C 106, L061303 (2022)

H.L.Crawford, M.D.Jones, A.O.Macchiavelli, P.Fallon, D.Bazin, P.C.Bender, B.A.Brown, C.M.Campbell, R.M.Clark, M.Cromaz, B.Elman, A.Gade, J.D.Holt, R.V.F.Janssens, I.Y.Lee, B.Longfellow, S.Paschalis, M.Petri, A.L.Richard, M.Salathe, J.A.Tostevin, D.Weisshaar

Core of 25F studied by the 25F(-p) proton-removal reaction

NUCLEAR REACTIONS 9Be(25F, 24O), E=77 MeV/nucleon; measured reaction products; deduced longitudinal momentum distribution, proton removal σ, spectroscopic factor. Results are interpreted within the framework of the Particle-Vibration Coupling (PVC) model, of a d5/2 proton coupled to a quadrupole phonon of an effective 24O core. Comparison to shell model predictions. Reaction products analyzed by spectrometer S800 (NSCL). Secondary 25F beam from 48Ca fragmentation on Be target at accelerated through the Coupled Cyclotron Facility.

doi: 10.1103/PhysRevC.106.L061303
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2022GA31      Phys.Rev.Lett. 129, 242501 (2022)

A.Gade, B.A.Brown, D.Weisshaar, D.Bazin, K.W.Brown, R.J.Charity, P.Farris, A.M.Hill, J.Li, B.Longfellow, D.Rhodes, W.Reviol, J.A.Tostevin

Dissipative Reactions with Intermediate-Energy Beams: A Novel Approach to Populate Complex-Structure States in Rare Isotopes

NUCLEAR REACTIONS 9Be(38Ca, 38Ca'), E=60.9 MeV/nucleon; measured reaction products, Eγ, Iγ. 38Ca; deduced γ-ray energies and relative intensities, partial level scheme, multiparticle-multihole excited states, negative-parity, complex-structure final states. Comparison with shell model calculations. The Coupled Cyclotron Facility at NSCL, GRETINA array.

doi: 10.1103/PhysRevLett.129.242501
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2022GA32      Phys.Rev. C 106, 064303 (2022)

A.Gade, D.Weisshaar, B.A.Brown, D.Bazin, K.W.Brown, R.J.Charity, P.Farris, A.M.Hill, J.Li, B.Longfellow, D.Rhodes, W.Reviol, J.A.Tostevin

Exploiting dissipative reactions to perform in-beam γ-ray spectroscopy of the neutron-deficient isotopes 38, 39Ca

NUCLEAR REACTIONS 9Be(38Ca, 38Ca), (38Ca, 39Ca), E=60.9 MeV/nucleon; measured reaction products Eγ, Iγ, γγ-coin, (particle)γ-coin. 38,39Ca; deduced levels, J, π, high-spin states. Comparison to shell-model calculations using the FSU spsdf p interaction and experimental results for 39K mirror nuclei. High resolution γ-ray tracking array GRETINA coupled with S800 spectroraph. Beam from fragmentation of 40Ca 140 MeV/nucleon primary beam on 9Be target in the A1900 separator at Coupled Cyclotron Facility (NSCL).

doi: 10.1103/PhysRevC.106.064303
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Data from this article have been entered in the XUNDL database. For more information, click here.


2022GI04      Phys.Rev. C 105, 044321 (2022)

S.A.Gillespie, K.W.Brown, R.J.Charity, L.G.Sobotka, A.K.Anthony, J.Barney, A.Bonaccorso, B.A.Brown, J.Crosby, D.Dell'Aquila, J.Elson, J.Estee, A.Gade, M.Ghazali, G.Jhang, Y.Jin, B.Longfellow, W.G.Lynch, J.Pereira, M.Spieker, S.Sweany, F.C.E.Teh, A.Thomas, M.B.Tsang, C.Y.Tsang, D.Weisshaar, H.Y.Wu, K.Zhu

Proton decay spectroscopy of 28S and 30Cl

NUCLEAR REACTIONS 9Be(29S, n), (31Ar, p), E=150 MeV/nucleon; measured reaction products, Ep, Ip, Eγ, Iγ, (particle)p-coin, pγ-coin; deduced invariant mass, momentum distribution. Setup consisting of S800 spectrograph, Si-CsI(Tl) DSSD array of 128 concentric rings and 128 annular sectors, CAESAR CsI(Na) photon detection array, BC-400-type scintillation fiber detector at A1900 fragment separator (NSCL).

RADIOACTIVITY 28S(p), (2p) [from 9Be(29S, n), E=150 MeV/nucleon]; 30Cl(p), (2p) [from 9Be(29S, n), E=150 MeV/nucleon]; measured Ep, Ip, Eγ, Iγ, pγ-coin; deduced total decay kinetic energy, decay energy spectrum. 30Cl; deduced levels, J, π, S(p). 28S; deduced levels, J, π, spectroscopic factors. Comparison to previous experimental results and shell model calculations.

doi: 10.1103/PhysRevC.105.044321
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2022GI06      Phys.Rev. C 105, 055801 (2022)

S.Giraud, R.G.T.Zegers, B.A.Brown, J.-M.Gabler, J.Lesniak, J.Rebenstock, E.M.Ney, J.Engel, A.Ravlic, N.Paar

Finite-temperature electron-capture rates for neutron-rich nuclei near N=50 and effects on core-collapse supernova simulations

RADIOACTIVITY 86Kr(EC); calculated Gamow-Teller strength distribution, EC-rates for various energies of initial states, average shell occupation. N=44-54(EC); Z=26-36(EC); calculated EC-rates. Finite-temperature proton-neutron relativistic QRPA (FT-PNRQRPA), finite-temperature QRPA (FT-QRPA) and shell-model calculations. Obtained finite-temperature electron-capture rates applied in one-dimensional core-collapse simulations.

doi: 10.1103/PhysRevC.105.055801
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2022LA10      Phys.Rev.Lett. 129, 122501 (2022)

L.Lalanne, O.Sorlin, A.Poves, M.Assie, F.Hammache, S.Koyama, D.Suzuki, F.Flavigny, V.Girard Alcindor, A.Lemasson, A.Matta, T.Roger, D.Beaumel, Y.Blumenfeld, B.A.Brown, F.De Oliveira Santos, F.Delaunay, N.de Sereville, S.Franchoo, J.Gibelin, J.Guillot, O.Kamalou, N.Kitamura, V.Lapoux, B.Mauss, P.Morfouace, M.Niikura, J.Pancin, T.Y.Saito, C.Stodel, J-C.Thomas

Structure of 36Ca under the Coulomb Magnifying Glass

NUCLEAR REACTIONS 1H(37Ca, d), (38Ca, t)36Ca, E≈50 MeV/nucleon, [37,38Ca secondary beams incident on CRYPTA hydrogen target from 9Be(40Ca, X), E=95 MeV/nucleon primary reaction, followed by separation of fragments using LISE3 spectrometer at GANIL facility]; measured outgoing 36Ca ions, E(d), I(d), E(t), I(t), (36Ca)(37Ca)-coin, (36Ca)(38Ca)-coin, (36Ca)d-coin, (36Ca)t-coin, (36Ca)p-coin, (36Ca)2p-coin, using zero-degree detection (ZDD) system for 36Ca, multiwire detectors CATS array for 37Ca, six MUST2 telescopes with double-sided Silicon strip detector (DSSSD) and 16 CsI crystals for deuterons, tritons and protons. 36Ca; deduced levels, proton resonances, J, π, 0+ as the first excited state, L-transfers, spectroscopic factors, configurations and their amplitudes, mirror energy differences (MEDs) of levels in 36Ca and 36S. DWBA analysis. Comparison with shell-model calculations with configuration interaction (SM CI) using the sd-pf valence space, and with previous experimental results. 34Ar, 35K; deduced levels from the 2p decay of 7.84-MeV level in 36Ca. Details of experimental and theoretical spectroscopic data provided in the Supplemental Material of the paper.

doi: 10.1103/PhysRevLett.129.122501
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2022LI54      Phys.Rev. C 106, 044313 (2022)

D.Little, A.D.Ayangeakaa, R.V.F.Janssens, S.Zhu, Y.Tsunoda, T.Otsuka, B.A.Brown, M.P.Carpenter, A.Gade, D.Rhodes, C.R.Hoffman, F.G.Kondev, T.Lauritsen, D.Seweryniak, J.Wu, J.Henderson, C.Y.Wu, P.Chowdhury, P.C.Bender, A.M.Forney, W.B.Walters

Multistep Coulomb excitation of 64Ni: Shape coexistence and nature of low-spin excitations

NUCLEAR REACTIONS 208Pb(64Ni, 64Ni'), E=272 MeV; measured reaction products, time-of-flight difference between the projectile and target recoils as a function of scattering angle, Eγ, Iγ, (particle)γ-coin, Coulomb-excitation yields using GRETINA array with 12 modules of 48 highly-segmented coaxial HPGe crystals for γ detection, and CHICO2 array of 20 position-sensitive parallel-plate avalanche counters for the detection of scattered particles at the ATLAS-ANL facility. Multistep safe Coulomb-excitation. 64Ni; deduced levels, J, π, E2 matrix elements using GOSIA least-squares fitting code, B(E2), spectroscopic electric quadrupole moments, evidence for triple shape coexistence. Comparison with previous experimental results, and with Monte Carlo shell-model (MCSM), and conventional shell-model calculations.

NUCLEAR STRUCTURE 64Ni; calculated levels, J, π, B(E2), spectroscopic quadrupole moments, proton and neutron orbital occupancies for 2+ and 0+ states using Monte Carlo shell-model (MCSM), and conventional shell-model calculations with the jj44 and fp effective interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.106.044313
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2022ME04      Phys.Rev. C 105, 025804 (2022)

Z.Meisel, A.Hamaker, G.Bollen, B.A.Brown, M.Eibach, K.Gulyuz, C.Izzo, C.Langer, F.Montes, W.-J.Ong, D.Puentes, M.Redshaw, R.Ringle, R.Sandler, H.Schatz, S.Schwarz, C.S.Sumithrarachchi, A.A.Valverde, I.T.Yandow

Improved nuclear physics near A=61 refines urca neutrino luminosities in accreted neutron star crusts

ATOMIC MASSES 61Zn; measured time of flight, cyclotron frequency; deduced mass excess. Compared with AME2020 results. Low Energy Beam and Ion Trap (LEBIT) facility at the NSCL.

NUCLEAR REACTIONS 61Zn, 60Cu(p, γ), T=0.10-10 GK; deduced Q from obtained new value for 61Zn atomic mass, astrophysical reaction rates. Computed neutrino luminosity from the mass number A = 61 urca cooling source in accreted neutron-star crusts. Comparison to NON-SMOKER, TALYS codes results.

doi: 10.1103/PhysRevC.105.025804
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2022NA07      Nucl.Phys. A1018, 122359 (2022)

F.Naqvi, S.Karampagia, A.Spyrou, S.N.Liddick, A.C.Dombos, D.L.Bleuel, B.A.Brown, L.Crespo Campo, A.Couture, B.Crider, T.Ginter, M.Guttormsen, A.C.Larsen, R.Lewis, P.Moller, S.Mosby, G.Perdikakis, C.Prokop, T.Renstrom, S.Siem

Total absorption spectroscopy measurement on neutron-rich 74, 75Cu isotopes

RADIOACTIVITY 74,75Cu(β-) [from 9Be(86Kr, X), E=140 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced T1/2, cumulative β-decay intensities, B(GT). Comparison with available data.

doi: 10.1016/j.nuclphysa.2021.122359
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2022PO01      Phys.Rev. C 105, 034310 (2022)

R.Powel, B.A.Brown, J.D.Holt, A.Klose, K.Konig, J.Lantis, K.Minamisono, T.Miyagi, S.Pineda

Ground state magnetic dipole moment of 40Sc

NUCLEAR MOMENTS 40,41Sc; measured hyperfine structure spectra; deduced hyperfine coupling constants, magnetic dipole moments, electric quadrupole moments. Comparison to shell-model and multishell in-medium similarity renormalization group (IMSRG) calculations. Collinear laser spectroscopy technique at NSCL-BECOLA facility. Scandium beam produced in 9Be(40Ca, X), E=140 MeV/nucleon reaction, and transported using A1900 fragment separator at NSCL-MSU. Systematics of experimental and theoretical magnetic moments of ground states of 40,41Sc, 39,41Ca, 39,40K.

doi: 10.1103/PhysRevC.105.034310
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2022RH01      Phys.Rev. C 105, 024325 (2022)

D.Rhodes, B.A.Brown, A.Gade, S.Biswas, A.Chester, P.Farris, J.Henderson, A.Hill, J.Li, F.Nowacki, E.Rubino, D.Weisshaar, C.Y.Wu

Evolution of shape and collectivity along the Ge isotopic chain: The case of 80Ge

NUCLEAR REACTIONS 196Pt(80Ge, 80Ge'), E=3.52 MeV/nucleon [secondary 80Ge beam produced in 9Be(82Se, X) reaction]; measured reaction products Eγ, Iγ, (particle)γ-coin. 80Ge; deduced B(E2), E2 and M1 matrix elements, spectroscopic quadrupole moments. GOSIA analisys. Comparison to other experimental results and shell model calculations. Results indicate a large prolate deformation in 80Ge. Systematics of B(E2) and quadrupole moments for even-A Ge isotopes. Detector system - Joint Array for Nuclear Structure (JANUS) consisting of two annular silicon detectors (Bambino2) with the Segmented Germanium Array (SeGA). Beam provided by reaccelerator facility (ReA3) of NSCL.

doi: 10.1103/PhysRevC.105.024325
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2022SC13      Phys.Rev. C 106, 054323 (2022)

J.Schmitt, G.B.King, R.G.T.Zegers, Y.Ayyad, D.Bazin, B.A.Brown, A.Carls, J.Chen, A.Davis, M.DeNudt, J.Droste, B.Gao, C.Hultquist, H.Iwasaki, S.Noji, S.Pastore, J.Pereira, M.Piarulli, H.Sakai, A.Stolz, R.Titus, R.B.Wiringa, J.C.Zamora

Probing spin-isospin excitations in proton-rich nuclei via the 11C(p, n)11N reaction

NUCLEAR REACTIONS 1H(11C, n), E=95 MeV/nucleon; measured reaction products, time-of-flight, En, In, (particle)n-coin, angular distribution; deduced σ(θ), σ(θ, E), cumulative Gamow-Teller transition strengths, B(GT) values to the 1/2- state at 0.73 MeV and the 3/2- state at 2.86 MeV in 11N. Multipole decomposition analysis. Comparison to shell-model calculations with wbp interaction and to experimental data on the 11B(n, p), (d, 2He), (t, 3He) reactions. Ursinus liquid hydrogen target coupled to Low Energy Neutron Detector Array (LENDA) and S800 spectrograph. 11C beam produced from Be(16O, X) reaction and purified with A1900 fragment separator at Coupled Cyclotron Facility (CCF) at the NSCL.

doi: 10.1103/PhysRevC.106.054323
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2021BL02      Eur.Phys.J. A 57, 28 (2021)

B.Blank, N.Adimi, M.Alcorta, A.Bey, M.J.G.Borge, B.A.Brown, F.de Oliveira Santos, C.Dossat, H.O.U.Fynbo, J.Giovinazzo, H.H.Knudsen, M.Madurga, A.Magilligan, I.Matea, A.Perea, K.Summerer, O.Tengblad, J.C.Thomas

Detailed study of the decay of 32Ar

RADIOACTIVITY 32Ar(EC), (β+p); measured decay products, Ep, Ip, Eγ, Iγ, p-γ-coin.; deduced γ-ray energies and intensities, branching ratios, energy levels, J, π, Gamow-Teller strength distribution B(GT). Comparison with shell-model calculations.

doi: 10.1140/epja/s10050-020-00341-3
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2021BR06      Phys.Rev. C 103, 054327 (2021)

M.Brunet, Zs.Podolyak, T.A.Berry, B.A.Brown, R.J.Carroll, R.Lica, Ch.Sotty, A.N.Andreyev, M.J.G.Borge, J.G.Cubiss, L.M.Fraile, H.O.U.Fynbo, E.Gamba, P.Greenlees, L.J.Harkness-Brennan, M.Huyse, D.S.Judson, J.Konki, J.Kurcewicz, I.Lazarus, M.Madurga, N.Marginean, R.Marginean, I.Marroquin, C.Mihai, E.Nacher, A.Negret, S.Pascu, R.D.Page, A.Perea, J.Phrompao, M.Piersa, V.Pucknell, P.Rahkila, E.Rapisarda, P.H.Regan, F.Rotaru, M.Rudigier, C.M.Shand, R.Shearman, E.C.Simpson, T.Stora, O.Tengblad, P.Van Duppen, V.Vedia, S.Vinals, R.Wadsworth, N.Warr, H.De Witte

Competition between allowed and first-forbidden β decays of 208At and expansion of the 208Po level scheme

RADIOACTIVITY 208At(EC), (β+)[from Pb(p, X), E-1.4 GeV beam from the PS-Booster at CERN-ISOLDE facility, followed by separation of 208At fragments using the General Purpose Separator]; measured Eγ, Iγ, βγγ-coin, γγ-coin using four HPGe clover detectors at the IDS and a TIGRESS Ge detector from TRIUMF. 208Po; deduced levels, J, π, Iβ feedings, logft values, γ-branching ratios. Comparison with previous experimental results, and with shell-model calculations. Discussed competition between allowed and first-forbidden β-decays.

doi: 10.1103/PhysRevC.103.054327
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2021CH47      Phys.Rev. C 104, 034313 (2021)

D.Chrisman, A.N.Kuchera, T.Baumann, A.Blake, B.A.Brown, J.Brown, C.Cochran, P.A.DeYoung, J.E.Finck, N.Frank, P.Gueye, H.Karrick, H.Liu, J.McDonaugh, T.Mix, B.Monteagudo, T.H.Redpath, W.F.Rogers, R.Seaton-Todd, A.Spyrou, K.Stiefel, M.Thoennessen, J.A.Tostevin, D.Votaw

Neutron-unbound states in 31Ne

NUCLEAR REACTIONS 9Be(33Mg, X)31Ne, E=89 MeV/nucleon; measured reaction fragments and neutrons detected by the MoNa-LISA-Sweeper array at NSCL-MSU cyclotron facility; reconstructed decay energy for 30Ne+n from invariant mass spectroscopy. 31Ne; deduced levels, neutron-unbound states from the two-body decay-energy spectrum. Comparison with shell-model calculations using FSU interaction within the NUSHELLX code, combined with two-proton knockout cross-section calculations using the eikonal reaction theory. Relevance to 31Ne being a prime example of a halo nucleus in the island of inversion.

doi: 10.1103/PhysRevC.104.034313
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2021CH56      Phys.Rev. C 104, 054314 (2021)

A.Chester, B.A.Brown, S.P.Burcher, M.P.Carpenter, J.J.Carroll, C.J.Chiara, P.A.Copp, B.P.Crider, J.T.Harke, D.E.M.Hoff, K.Kolos, S.N.Liddick, B.Longfellow, M.J.Mogannam, T.H.Ogunbeku, C.J.Prokop, D.Rhodes, A.L.Richard, O.A.Shehu, A.S.Tamashiro, R.Unz, Y.Xiao

Identification of a new isomeric state in 76Zn following the β decay of 76Cu

RADIOACTIVITY 76Cu(β-)[from 9Be(86Kr, X), E=140 MeV/nucleon, followed by separation of fragments of interest using A1900 fragment separator at NSCL-MSU facility]; measured reaction products, particle identification plot of ions implanted in CeBr3 detector, Eγ, Iγ, (76Cu implants)γ-coin, γγ-coin, T1/2 of a nanosecond isomer by fast timing method using an array of 16 HPGe clover detectors and 15 LaBr3 detectors. 76Zn; deduced levels, J, π, new isomer, Comparison with shell-model calculations.

NUCLEAR STRUCTURE 76Zn; calculated levels, J, π, level T1/2, isomers, proton and neutron occupancy numbers of negative-parity isomeric states using shell model with jj4b, jj4c and JUN45 interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.104.054314
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2021GA15      Phys.Rev.Lett. 126, 152701 (2021)

B.Gao, S.Giraud, K.A.Li, A.Sieverding, R.G.T.Zegers, X.Tang, J.Ash, Y.Ayyad-Limonge, D.Bazin, S.Biswas, B.A.Brown, J.Chen, M.DeNudt, P.Farris, J.M.Gabler, A.Gade, T.Ginter, M.Grinder, A.Heger, C.Hultquist, A.M.Hill, H.Iwasaki, E.Kwan, J.Li, B.Longfellow, C.Maher, F.Ndayisabye, S.Noji, J.Pereira, C.Qi, J.Rebenstock, A.Revel, D.Rhodes, A.Sanchez, J.Schmitt, C.Sumithrarachchi, B.H.Sun, D.Weisshaar

New 59Fe Stellar Decay Rate with Implications for the 60Fe Radioactivity in Massive Stars

NUCLEAR REACTIONS 59Co(t, 3He)59Fe, E=115 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, σ(θ), B(GT), β-decay rates. Comparison with stellar evolution calculations.

doi: 10.1103/PhysRevLett.126.152701
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2021GA28      Phys.Rev. C 104, 024313 (2021)

A.Gade, R.V.F.Janssens, B.A.Brown, R.G.T.Zegers, D.Bazin, P.Farris, A.M.Hill, J.Li, D.Little, B.Longfellow, F.Nowacki, D.Rhodes, D.Weisshaar

In-beam γ-ray spectroscopy of 68Fe from charge exchange on 68Co projectiles

NUCLEAR REACTIONS 9Be(68Co, 68Fe), E=95 MeV/nucleon, [secondary 68Co beam from 9Be(82Se, X), E=140 MeV/nucleon primary reaction, followed by separation of fragments using the A1900 fragment separator at NSCL-MSU]; measured reaction products, particle-identification spectrum using S-800 spectrograph, Eγ, Iγ, γγ- and (particle)γ-coin using GRETINA array of 11 modules of 36-fold segmented HPGe detectors. 68Fe; deduced levels, J, π, inclusive σ. Comparison with shell-model calculations using the LNPS interaction, and f7j4a Hamiltonian.

doi: 10.1103/PhysRevC.104.024313
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2021GI18      Nat. Commun. 12, 1 (2021)

J.Giovinazzo, T.Roger, B.Blank, D.Rudolph, B.A.Brown, H.Alvarez-Pol, A.Arokia Raj, P.Ascher, M.Caamano-Fresco, L.Caceres, D.M.Cox, B.Fernandez-Dominguez, J.Lois-Fuentes, M.Gerbaux, S.Grevy, G.F.Grinyer, O.Kamalou, B.Mauss, A.Mentana, J.Pancin, J.Pibernat, J.Piot, O.Sorlin, C.Stodel, J.-C.Thomas, M.Versteegen

4D-imaging of drip-line radioactivity by detecting proton emission from 54mNi pictured with ACTAR TPC

RADIOACTIVITY 54Ni(IT), (p) [from 9Be(58Ni, X)54mN, E=75 MeV/nucleon]; measured decay products, Ep, Ip; deduced proton-emission branching ratios from an isomeric state, spectroscopic factors, decay widths, T1/2. Comparison with shell model calculations using GXPF1A and KB3G interactions. The ACTAR TPC device.

doi: 10.1038/s41467-021-24920-0
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2021HA01      Phys.Rev.Lett. 126, 042701 (2021)

S.Hallam, G.Lotay, A.Gade, D.T.Doherty, J.Belarge, P.C.Bender, B.A.Brown, J.Browne, W.N.Catford, B.Elman, A.Estrade., M.R.Hall, B.Longfellow, E.Lunderberg, F.Montes, M.Moukaddam, P.O'Malley, W.-J.Ong, H.Schatz, D.Seweryniak, K.Schmidt, N.K.Timofeyuk, D.Weisshaar, R.G.T.Zegers

Exploiting Isospin Symmetry to Study the Role of Isomers in Stellar Environments

NUCLEAR REACTIONS 12C, 2H(26Si, 11C), (26Si, p)27Si, E=30 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, partial σ, branching ratios, J, π, spectroscopic factors. Comparison with shell model calculations, REACLIB data. GRETINA array.

doi: 10.1103/PhysRevLett.126.042701
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2021HI09      Phys.Rev. C 104, 014305 (2021)

A.M.Hill, A.Gade, D.Bazin, B.A.Brown, B.Elman, P.Farris, J.Li, B.Longfellow, J.Pereira, A.Revel, D.Rhodes, M.Spieker, D.Weisshaar

In-beam γ-ray spectroscopy of 37-42P

NUCLEAR REACTIONS 12C(45Cl, X), 37P/38P/39P/40P/41P/42P, E=62.5 MeV/nucleon, [secondary 45Cl beam produced in 9Be(48Ca, X), E=140 MeV/nucleon primary reaction at NSCL-MSU, followed by separation of fragments using A1900 fragment separator]; measured reaction products and particle identification spectra by energy loss and time-of-flight using S800 spectrograph, ionization chamber and plastic scintillators, Eγ, Iγ, γγ- and (particle)g-coin, T1/2 of levels by Doppler shifts using GRETINA array of four 36-fold segmented HPGe crystals. 37,38,39,40,41,42P; deduced levels, J, π, γ-branching ratios, Nilsson configurations of low-lying levels. Comparison with shell-model calculations.

NUCLEAR STRUCTURE 37,38,39,40,41,42P; calculated levels, J, π, T1/2 of levels, level schemes with γ transitions, E2 matrix elements, B(M1), B(E2), magnetic dipole and electric quadrupole moments using shell-model with SDPF-MU interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.104.014305
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2021KA45      Phys.Rev. C 104, L061303 (2021)

M.Kamil, S.Triambak, A.Magilligan, A.Garcia, B.A.Brown, P.Adsley, V.Bildstein, C.Burbadge, A.Diaz Varela, T.Faestermann, P.E.Garrett, R.Hertenberger, N.Y.Kheswa, K.G.Leach, R.Lindsay, D.J.Marin-Lambarri, F.Ghazi Moradi, N.J.Mukwevho, R.Neveling, J.C.Nzobadila Ondze, P.Papka, L.Pellegri, V.Pesudo, B.M.Rebeiro, M.Scheck, F.D.Smit, H.-F.Wirth

Isospin mixing and the cubic isobaric multiplet mass equation in the lowest T=2, A=32 quintet

ATOMIC MASSES 32Ar, 32Cl, 32S, 32P, 32Si; analyzed experimental masses by a cubic fit to the isobaric multiplet mass equation (IMME) for the lowest isospin T=2 quintet in A=32 nuclei; investigated isospin mixing by combining high-resolution experimental data for proton spectrum from 32Ar β-delayed proton decay, and from triton spectrum in 32S(3He, t) reaction with the state-of-the-art shell-model calculations; evaluated isospin mixing matrix elements; extracted cubic and quartic coefficients of the IMME; deduced that isospin mixing with nonanalog T=1 states contributes to the IMME breakdown. 32Ar; analyzed experimental β-delayed proton spectrum by R-matrix fit; calculated proton emission amplitudes from states in 32Cl.

doi: 10.1103/PhysRevC.104.L061303
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2021KU26      Phys.Rev. C 104, 044601 (2021)

K.Kuhn, F.Sarazin, F.M.Nunes, M.A.G.Alvarez, C.Andreoiu, D.W.Bardayan, P.C.Bender, J.C.Blackmon, M.J.G.Borge, R.Braid, B.A.Brown, W.N.Catford, C.Aa.Diget, A.DiPietro, T.E.Drake, P.Figuera, A.B.Garnsworthy, J.Gomez-Camacho, G.Hackman, U.Hager, S.V.Ilyushkin, E.Nacher, P.D.O'Malley, A.Perea, V.Pesudo, S.T.Pittman, D.Smalley, C.E.Svensson, O.Tengblad, P.Thompson, C.Unsworth, Z.M.Wang

Experimental study of the nature of the 1- and 2- excited states in 10Be using the 11Be(p, d) reaction in inverse kinematics

NUCLEAR REACTIONS 1H(11Be, d)10Be, (11Be, p), (11Be, p'), E=9.93 MeV/nucleon, [secondary 11Be beam from Ta(p, X), E=479 MeV primary reaction at TRIUMF cyclotron, followed by extraction of 11Be using Resonant Ionization Laser Ion Source (TRILIS) and accelerated through the ISAC-I and ISAC-II accelerators]; measured E(d), I(d), E(p), I(p), elastic and inelastic σ(θ) of outgoing protons, σ(θ) for deuterons using silicon telescopes, Eγ, Iγ, dγ-coin using TIGRESS array of 12 HPGe detectors for γ detection. 10Be; deduced levels, spectroscopic factors for 5960, 1- and 6263, 2- levels, mixed configurations with halo and cluster structures. Comparison of spectroscopic factors with predictions of shell model. Reaction kinematics and angular distributions analyzed using two versions of transfer reaction model considering one-step and two-step processes. Comparison with previous experimental results from RCNP and ISOLDE-CERN.

doi: 10.1103/PhysRevC.104.044601
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2021LA04      Phys.Rev. C 103, 055809 (2021)

L.Lalanne, O.Sorlin, M.Assie, F.Hammache, N.de Sereville, S.Koyama, D.Suzuki, F.Flavigny, D.Beaumel, Y.Blumenfeld, B.A.Brown, F.De Oliveira Santos, F.Delaunay, S.Franchoo, J.Gibelin, V.Girard Alcindor, J.Guillot, O.Kamalou, N.Kitamura, V.Lapoux, A.Lemasson, A.Matta, B.Mauss, P.Morfouace, M.Niikura, J.Pancin, A.Poves, T.Roger, T.Saito, C.Stodel, J-C.Thomas

Evaluation of thE 35K(p, γ)36Ca reaction rate using the 37Ca(p, d)36Ca transfer reaction

NUCLEAR REACTIONS 1H(37Ca, d)36Ca, E=48 MeV/nucleon, [secondary 37Ca beam from 9Be(40Ca, X), E=95 MeV/nucleon primary reaction, followed by separation of fragments of interest by using Bρ-ΔE-Bρ and TOF method using LISE3 spectrometer at GANIL facility, liquid hydrogen CRYPTA target; measured energies and angles of transfer-like nuclei by Z, and TOF using zero degree detection (ZDD) setup of ionization chamber and two drift chambers and six MUST2 telescopes, (36Ca)d- and (35K)d-coin, pd(θ), 36,37Ca, 34Ar; deduced mass excesses and compared with literature values. 36Ca; deduced levels, resonances J, π; calculated Γγ, Γp, resonance strengths. 35K(p, γ)36ca; calculated thermonuclear reaction rates at T=0.4-6 GK. 1H(37Ca, X)32S/33Cl/34Ar/35Ar/35K/36Ca/36K/37Ca, E=48 MeV/nucleon; measured yields of reaction products by energy loss vs TOF using ZDD ionization chamber, and CATS detector at GANIL.

doi: 10.1103/PhysRevC.103.055809
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2021LE02      Phys.Rev.Lett. 126, 042501 (2021)

E.Leistenschneider, E.Dunling, G.Bollen, B.A.Brown, J.Dilling, A.Hamaker, J.D.Holt, A.Jacobs, A.A.Kwiatkowski, T.Miyagi, W.S.Porter, D.Puentes, M.Redshaw, M.P.Reiter, R.Ringle, R.Sandler, C.S.Sumithrarachchi, A.A.Valverde, I.T.Yandow, TITAN Collaboration

Precision Mass Measurements of Neutron-Rich Scandium Isotopes Refine the Evolution of N = 32 and N = 34 Shell Closures

ATOMIC MASSES 50,51,52,53,54,55Sc; measured frequencies of cyclotron motion; deduced TOF-ICR spectrum, mass excess, mass ratios. Comparison with the AME2016 atomic mass evaluation data, predictions from both ab initio and phenomenological nuclear theories.

doi: 10.1103/PhysRevLett.126.042501
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2021LE13      Phys.Rev.Lett. 127, 062501 (2021)

D.Lee, S.Bogner, B.A.Brown, S.Elhatisari, E.Epelbaum, H.Hergert, M.Hjorth-Jensen, H.Krebs, N.Li, B.-N.Lu, U.-G.Meissner

Hidden Spin-Isospin Exchange Symmetry

doi: 10.1103/PhysRevLett.127.062501
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2021LO08      Phys.Rev. C 103, 054309 (2021)

B.Longfellow, D.Weisshaar, A.Gade, B.A.Brown, D.Bazin, K.W.Brown, B.Elman, J.Pereira, D.Rhodes, M.Spieker

Quadrupole collectivity in the neutron-rich sulfur isotopes 38, 40, 42, 44S

NUCLEAR REACTIONS 209Bi(38S, 38S'), E=75 MeV; 209Bi(40S, 40S'), E=76 MeV; 209Bi(42S, 42S'), E=80 MeV; 209Bi(44S, 44S'), E=73 MeV, [secondary 38,40,42,44S beams from 9Be(48Ca, X), E=140 MeV/nucleon primary reaction, followed by separation of fragments using A1900 fragment separator at the NSCL-MSU facility]; measured reaction products, particle identification from energy loss and time of flight, Eγ, Iγ, (scattered S ions)γ-coin using S800 spectrograph for particles and CAESAR array of 192 CsI(Na) detectors for γ rays in intermediate-energy Coulomb excitation. 38,40,42,44S; deduced levels, B(E2) for the first 2+ states from Coulomb excitation yields and Alder-Winther model. Comparison with previous experimental results, and with predictions of shell-model calculations using the SDPF-MU Hamiltonian. Systematics of B(E2) values for the first 2+ states in 36,38,40,42,44,46S, 36,38,40,42,44,46,48Ar, 42,44,46,48,50Ca.

doi: 10.1103/PhysRevC.103.054309
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2021MA73      Phys.Rev. C 104, L051302 (2021)

A.Magilligan, B.A.Brown, S.R.Stroberg

Data-driven configuration-interaction Hamiltonian extrapolation to 60Ca

NUCLEAR STRUCTURE 46,47,48,49,50,51,52,53,54,55,56,57,58,59,60Ca; calculated levels, J, π, S(2n); comparison of the two-body matrix elements (TBME) between the UFP-CA and the initial IMSRG interaction; deduced likely doubly magic nature of 60Ca at a level similar to that of 68Ni. State-of-the-art in-medium similarity renormalization group (IMSRG) interaction, with universal fp shell interaction for calcium isotopes (UFP-CA). Comparison with experimental data.

doi: 10.1103/PhysRevC.104.L051302
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2021OR05      Phys.Rev. C 104, L061305 (2021)

J.N.Orce, E.J.Martin Montes, K.J.Abrahams, C.Ngwetsheni, B.A.Brown, M.Kumar Raju, C.V.Mehl, M.J.Mokgolobotho, E.H.Akakpo, D.L.Mavela, P.Adsley, R.A.Bark, N.Bernier, T.D.Bucher, N.R.Erasmus, T.S.Dinoko, P.M.Jones, N.Y.Kheswa, N.A.Khumalo, E.A.Lawrie, J.J.Lawrie, B.L.Lesch, S.N.T.Majola, S.S.Ntshangase, P.Papka, V.Pesudo, B.Rebeiro, O.Shirinda, M.Wiedeking, W.Yahia-Cherif

Reorientation-effect measurement of the < 2+1 Ε2 2+1 > matrix element in 36Ar

NUCLEAR REACTIONS 194Pt(36Ar, 36Ar), E=134.2 MeV; measured Eγ, Iγ, γ(θ), (particle)γ-coin using AFRODITE array of eight HPGe clover detectors coupled to an annular, double-sided silicon detector at iThemba LABS; analyzed Coulomb excitation yields using semiclassical coupled-channel Coulomb-excitation least-squares code GOSIA. 36Ar; deduced E2 matrix element and B(E2) for the first 2+ state, diagonal E2 matrix element and spectroscopic quadrupole moment for the first 2+ state.Systematics of Q(for first 2+)/B(E2) for first 2+ in 20Ne, 24Mg, 28Si, 32S, 36Ar.

NUCLEAR MOMENTS 36Ar; measured spectroscopic quadrupole moment of the first excited 2+ state by reorientation-effect in Coulomb excitation using 194Pt(36Ar, 36Ar), E=134.2 MeV, and analyzing Coulomb excitation yields using GOSIA code. Comparison with beyond mean-field and large-scale shell-model calculations, and with experimental spectroscopic quadrupole moments for the first 2+ states in 20Ne, 24Mg, 28Si, 32S, 36Ar.

doi: 10.1103/PhysRevC.104.L061305
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2021PE08      Phys.Rev. C 103, 055808 (2021)

C.F.Persch, P.A.DeYoung, S.Lyons, A.Spyrou, S.N.Liddick, F.Naqvi, B.P.Crider, A.C.Dombos, J.Gombas, D.L.Bleuel, B.A.Brown, A.Couture, L.Crespo Campo, J.Engel, M.Guttormsen, A.C.Larsen, R.Lewis, S.Karampagia, S.Mosby, E.M.Ney, A.Palmisano, G.Perdikakis, C.J.Prokop, T.Renstrom, S.Siem, M.K.Smith, S.J.Quinn

β-decay feeding intensity distributions of 71, 73Ni

RADIOACTIVITY 71,73Ni(β-)[from 9Be(86Kr, X), E=140 MeV/nucleon, followed by separation of fragments using A1900 fragment separator at NSCL-MSU facility]; measured implantation events and β particles using position-sensitive, double-sided, silicon-strip detector (DSSD), and two silicon PIN detectors for TOF and energy loss, Eγ, Iγ, half-lives of decays of 71,73Ni using a total absorption summing NaI(Tl) detector (SuN) surrounding the DSSD; deduced multiplicity spectra, Iβ(E) feedings, B(GT). GEANT4 and DICEBOX analysis of total absorption spectrum (TAS). Comparison with QRPA, and shell-model calculations, the latter using NuShellX@MSU code with JJ44B and JUN45 interaction Hamiltonians. Relevance to improvement in the nuclear input for r-process calculations.

NUCLEAR REACTIONS 9Be(86Kr, X)71Ni/73Ni/71Cu/73Cu/, E=140 MeV/nucleon; measured yields of reaction products using A1900 fragment separator and two silicon PIN detectors for TOF and energy loss at NSCL-MSU facility.

doi: 10.1103/PhysRevC.103.055808
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2021PI10      Phys.Rev.Lett. 127, 182503 (2021)

S.V.Pineda, K.Konig, D.M.Rossi, B.A.Brown, A.Incorvati, J.Lantis, K.Minamisono, W.Nortershauser, J.Piekarewicz, R.Powel, F.Sommer

Charge Radius of Neutron-Deficient 54Ni and Symmetry Energy Constraints Using the Difference in Mirror Pair Charge Radii

NUCLEAR REACTIONS 9Be(58Ni, 54Ni), E not given; measured resonance spectra, frequencies. 54Ni; deduced nuclear root-mean-square charge radius. Comparison with available data. BECOLA, National Superconducting Cyclotron Laboratory at Michigan State University.

doi: 10.1103/PhysRevLett.127.182503
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2021RE11      Phys.Rev. C 104, 034309 (2021)

B.M.Rebeiro, S.Triambak, P.E.Garrett, B.A.Brown, G.C.Ball, R.Lindsay, P.Adsley, V.Bildstein, C.Burbadge, A.Diaz-Varela, T.Faestermann, R.Hertenberger, B.Jigmeddorj, M.Kamil, K.G.Leach, P.Z.Mabika, J.C.Nzobadila Ondze, J.N.Orce, A.Radich, H.-F.Wirth

Spectroscopy of states in 136Ba using the 138Ba (p, t) reaction

NUCLEAR REACTIONS 138Ba(p, t), E=23 MeV; measured outgoing triton spectra, E(t), I(t), differential σ(θ) distributions using Q3D magnetic spectrometer at MLL-Munich tandem accelerator. DWBA analysis of σ(θ) data using DWUCK4 code using global proton optical model parameters. 136Ba; deduced levels, J, π. Comparison of measured level densities with shell model calculations, and with previous experimental data in ENSDF database. Discussed importance of 136Ba nuclear structure in the context of 136Xe double beta decay.

doi: 10.1103/PhysRevC.104.034309
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2021RH01      Phys.Rev. C 103, L051301 (2021)

D.Rhodes, B.A.Brown, J.Henderson, A.Gade, J.Ash, P.C.Bender, R.Elder, B.Elman, M.Grinder, M.Hjorth-Jensen, H.Iwasaki, B.Longfellow, T.Mijatovic, M.Spieker, D.Weisshaar, C.Y.Wu

Exploring the role of high-j configurations in collective observables through the Coulomb excitation of 106Cd

NUCLEAR REACTIONS 208Pb(106Cd, 106Cd'), E=4.03, 4.36 MeV/nucleon; 48Ti(106Cd, 106Cd'), E=3 MeV/nucleon; measured scattered 106Cd and recoil 208Pb, Eγ, Iγ, (particle)γ-coin, angular distributions, γ-ray yields using the JANUS array of two annular Si detectors and SeGA array of sixteen 32-fold segmented HPGe detectors at NSCL-MSU Re-accelerator facility. 106Cd; deduced levels, J, π, E2, M1 and E3 transition matrix elements, B(E2), level half-lives, spectroscopic quadrupole moments, ground-state rotational invariants and quadrupole moments, analysis using GOSIA and GOSIA2 least-squares fitting codes. Comparison with results of previous measurements and with shell-model calculations.

doi: 10.1103/PhysRevC.103.L051301
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2021SO05      Phys.Rev. C 103, 015802 (2021)

D.Soltesz, M.A.A.Mamun, A.V.Voinov, Z.Meisel, B.A.Brown, C.R.Brune, S.M.Grimes, H.Hadizadeh, M.Hornish, T.N.Massey, J.E.O'Donnell, W.E.Ormand

Determination of the 60Zn level density from neutron evaporation spectra

NUCLEAR REACTIONS 58Ni(3He, n), E=10 MeV; measured E(n), I(n) by time-of-flight method using NE213 liquid organic scintillators at Edwards Accelerator Laboratory; deduced differential σ(En) and for σ(Ep), the latter from experimental data in 2007Vo08, and compared to theoretical calculations using TALYS-V1.8. 60Zn; deduced level density for 60Zn as function of excitation energy up to 10 MeV, and compared to global theoretical models, including phenomenological, microscopic, and shell-model based calculations. Relevance to confirmation of Hauser-Feshbach formalism for 59Cu(p, γ)60Zn reaction rate at x-ray burst temperatures.

doi: 10.1103/PhysRevC.103.015802
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2021SU03      Phys.Rev. C 103, 014322 (2021)

L.J.Sun, M.Friedman, T.Budner, D.Perez-Loureiro, E.Pollacco, C.Wrede, B.A.Brown, M.Cortesi, C.Fry, B.E.Glassman, J.Heideman, M.Janasik, A.Kruskie, A.Magilligan, M.Roosa, J.Stomps, J.Surbrook, P.Tiwari

25Si β+-decay spectroscopy

RADIOACTIVITY 25Si(β+), (EC), (β+p)[from 9Be(36Ar, X), E=150 MeV/nucleon from the K500 and K1200 Coupled Cyclotron Facility at NSCL-MSU, followed by purification of 25Si beam by A1900 fragment separator]; measured Eγ, Iγ, γγ- and pγ-coin, E(p), I(p), half-life of 25Si decay using the Gaseous Detector with Germanium Tagging (GADGET) system of a proton detector and the SeGA array. 24Mg, 25Al; deduced levels, J, π, %Iβ+ feedings, %Iβp, γ branching ratios, logft, B(GT), Γγp and half-life for the 2673-keV level in 25Al, Γγ and Γγp for T=3/2 IAS in 25Al at 7902 keV. Comparison with shell-model calculations of levels, Jπ, β feedings, logft and B(GT) using USDC and USDI Hamiltonians, and with the experimental and theoretical decay characteristics of 25Na β- decay to 25Mg. Comparison with earlier experimental results.

doi: 10.1103/PhysRevC.103.014322
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2020BE10      Phys.Rev. C 101, 054311 (2020)

T.A.Berry, Zs.Podolyak, R.J.Carroll, R.Lica, B.A.Brown, H.Grawe, Ch.Sotty, N.K.Timofeyuk, T.Alexander, A.N.Andreyev, S.Ansari, M.J.G.Borge, M.Brunet, J.R.Cresswell, C.Fahlander, L.M.Fraile, H.O.U.Fynbo, E.Gambna, W.Gelletly, R.-B.Gerst, M.Gorska, A.Gredley, P.Greenlees, L.J.Harkness-Brennan, M.Huyse, S.M.Judge, D.S.Judson, J.Konki, M.Kowalska, J.Kurcewicz, I.Kuti, S.Lalkovski, I.Lazarus, M.Lund, M.Madurga, N.Marginean, R.Marginean, I.Marroquin, C.Mihai, R.E.Mihai, E.Nacher, A.Negret, S.Nae, C.Nita, S.Pascu, R.D.Page, Z.Patel, A.Perea, J.Phrompao, M.Piersa, V.Pucknell, P.Rahkila, E.Rapisarda, P.H.Regan, F.Rotaru, M.Rudigier, C.M.Shand, R.Shearman, E.C.Simpson, S.Stegemann, T.Stora, O.Tengblad, A.Turturica, P.Van Duppen, V.Vedia, P.M.Walker, N.Warr, F.P.Wearing, H.De Witte

Octupole states in 207Tl studied through β decay

RADIOACTIVITY 207Hg(β-)[from 208Pb(p, X)207Hg, E=1.4 GeV]; measured Eγ, Iγ, βγ- and βγγ-coin, γγ(θ) using plastic scintillators for β-detection and four HPGe detectors for γ-detection at CERN-ISOLDE. 207Tl; deduced levels J, π, β feedings, multipolarities, logft, B(M1), B(E1), B(E2), B(M2), B(E3), configurations. Discussion of octupole phonon states. Comparison with state-of-the-art large-scale shell-model calculations, and with previous experimental results.

doi: 10.1103/PhysRevC.101.054311
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2020BR12      Phys. Rev. Res. 2, 022035 (2020)

B.A.Brown, K.Minamisono, J.Piekarewicz, H.Hergert, D.Garand, A.Klose, K.Konig, J.D.Lantis, Y.Liu, B.Maass, A.J.Miller, W.Nortershauser, S.V.Pineda, R.C.Powel, D.M.Rossi, F.Sommer, C.Sumithrarachchi, A.Teigelhofer, J.Watkins, R.Wirth

Implications of the 36Ca-36S and 38Ca-38Ar difference in mirror charge radii on the neutron matter equation of state

NUCLEAR STRUCTURE 36Ca, 36S, 38Ca, 38Ar; analyzed available data; deduced differences in charge radii between mirror nuclei, the slope of the symmetry energy L at the nuclear saturation density. Comparison with theoretical calculations of charge radii, differences and symmetry energy.

doi: 10.1103/PhysRevResearch.2.022035
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2020FR04      Phys.Rev. C 101, 052802 (2020)

M.Friedman, T.Budner, D.Perez-Loureiro, E.Pollacco, C.Wrede, J.Jose, B.A.Brown, M.Cortesi, C.Fry, B.Glassman, J.Heideman, M.Janasik, M.Roosa, J.Stomps, J.Surbrook, P.Tiwari

Low-energy 23Al β-delayed proton decay and 22Na destruction in novae

RADIOACTIVITY 23Al(β+), (β+p)[from 9Be(36Ar, X), E=150 MeV/nucleon]; measured Ep, Ip, Eγ, Iγ, γp-coin, β-delayed proton branching ratios using the Gaseous Detector with Germanium Tagging (GADGET) detector at the NSCL-MSU facility. Comparison with previous experimental values of β-delayed proton branching ratios.

NUCLEAR REACTIONS 22Na(p, γ), E(cm)=204 keV; deduced Γp/Γ and resonance strength for the 204-keV proton resonance (7.79-MeV, (7/2) state in 23Mg), and compared with previous experimental values.

doi: 10.1103/PhysRevC.101.052802
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2020GA02      Phys.Rev. C 101, 014308 (2020)

B.Gao, R.G.T.Zegers, J.C.Zamora, D.Bazin, B.A.Brown, P.Bender, H.L.Crawford, J.Engel, A.Falduto, A.Gade, P.Gastis, T.Ginter, C.J.Guess, S.Lipschutz, A.O.Macchiavelli, K.Miki, E.M.Ney, B.Longfellow, S.Noji, J.Pereira, J.Schmitt, C.Sullivan, R.Titus, D.Weisshaar

Gamow-Teller transitions to 93Zr via the 93Nb (t, 3He + γ) reaction at 115 MeV/u and its application to the stellar electron-capture rates

NUCLEAR REACTIONS 93Nb(t, 3He), E=115 MeV/nucleon; measured 3He particle spectra, Eγ, double-differential σ(θ) using S800 spectrograph and GRETINA array at NSCL-MSU Coupled Cyclotron Facility. 93Zr; deduced levels, L-transfer, J, π, B(GT), electron capture (EC) rates in the late evolution of core-collapse supernovae, DWBA and multipole decomposition analysis (MDA). Comparison with QRPA and shell-model calculations.

doi: 10.1103/PhysRevC.101.014308
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2020GA23      Phys.Lett. B 808, 135637 (2020)

A.Gade, D.Weisshaar, B.A.Brown, J.A.Tostevin, D.Bazin, K.Brown, R.J.Charity, P.J.Farris, A.M.Hill, J.Li, B.Longfellow, W.Reviol, D.Rhodes

In-beam γ-ray spectroscopy at the proton dripline: 40Sc

NUCLEAR REACTIONS 9Be(38Ca, X)40Sc, E=60.9 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π. Comparison with available data.

doi: 10.1016/j.physletb.2020.135637
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2020GI02      Acta Phys.Pol. B51, 577 (2020)

J.Giovinazzo, T.Goigoux, B.Blank, P.Ascher, M.Gerbaux, S.Grevy, T.Kurtukian Nieto, C.Magron, P.Doornenbal, N.Fukuda, N.Inabe, G.G.Kiss, T.Kubo, S.Kubono, S.Nishimura, H.Sakurai, Y.Shimizu, C.Sidong, P.-A.Soderstrom, T.Sumikama, H.Suzuki, H.Takeda, P.Vi, J.Wu, D.S.Ahn, J.Agramunt, A.Algora, V.Guadilla, A.Montaner-Piza, A.I.Morales, S.E.A.Orrigo, B.Rubio, Y.Fujita, M.Tanaka, W.Gelletly, P.Aguilera, F.Molina, F.Diel, D.Lubos, G.De Angelis, D.Napoli, C.Borcea, A.Boso, R.B.Cakirli, E.Ganioglu, J.Chiba, D.Nishimura, H.Oikawa, Y.Takei, S.Yagi, K.Wimmer, G.De France, S.Go, B.A.Brown

Two-proton radioactivity: The interesting case of 67Kr and Further Studies

RADIOACTIVITY 67Kr(2p), (β+), 57Zn, 59,61Ge, 63,65Se, 68,69Kr(EC), (β+), (β+p), 55,56Cu, 60Ga, 63Ge, 64,65As, 67Kr(EC), (β+)[from 9Be(78Kr, X), E=350 MeV/nucleon, followed by separation of fragments using BigRIPS and Zero Degree Spectrometer at RIBF-RIKEN]; measured E(p), I(p), Eγ, half-lives of decays of isotopes from time distribution of (fragment)(decay events) correlations using EURICA-WAS3ABi setup at RIKEN; deduced %2p for the decay of 67Kr, and %β+p for 59,61Ge, 63Se, 68,69Kr. Comparison with previous experimental results.

doi: 10.5506/APhysPolB.51.577
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2020HE25      Phys.Lett. B 809, 135678 (2020)

S.Heil, M.Petri, K.Vobig, D.Bazin, J.Belarge, P.Bender, B.A.Brown, R.Elder, B.Elman, A.Gade, T.Haylett, J.D.Holt, T.Huther, A.Hufnagel, H.Iwasaki, N.Kobayashi, C.Loelius, B.Longfellow, E.Lunderberg, M.Mathy, J.Menendez, S.Paschalis, R.Roth, A.Schwenk, J.Simonis, I.Syndikus, D.Weisshaar, K.Whitmore

Electromagnetic properties of 21O for benchmarking nuclear Hamiltonians

NUCLEAR REACTIONS 9Be(24F, 21O), E=95 MeV/nucleon; measured reaction products, Eγ, Iγ. 21O; deduced γ-ray energies, J, π, level T1/2, B(E2). Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2020.135678
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2020LO05      Phys.Rev. C 101, 031303 (2020)

B.Longfellow, A.Gade, J.A.Tostevin, E.C.Simpson, B.A.Brown, A.Magilligan, D.Bazin, P.C.Bender, M.Bowry, B.Elman, E.Lunderberg, D.Rhodes, M.Spieker, D.Weisshaar, S.J.Williams

Two-neutron knockout as a probe of the composition of states in 22Mg, 23Al, and 24Si

NUCLEAR REACTIONS 9Be(24Mg, 22Mg), E=95 MeV/nucleon; 9Be(25Al, 23Al), E=102 MeV/nucleon; 9Be(26Si, 24Si), E=109 MeV/nucleon, [secondary beams of 24Mg, 25Al and 26Si from 9Be(36Ar, X), E=150 MeV/nucleon primary reaction, followed by separation of fragments using A1900 fragment separator at NSCL-MSU facility]; measured reaction products, Eγ, Iγ, parallel momentum distributions using S800 spectrograph for particles and 192-element caesium-iodide scintillator array CAESAR for γ detection. 22Mg, 23Al, 24Si; deduced levels, J, π. Comparison with eikonal reaction theory and shell model calculations. Relevance to 23Al(p, γ)24Si astrophysical reaction rates.

doi: 10.1103/PhysRevC.101.031303
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2020LO12      Phys.Rev.Lett. 125, 232501 (2020)

B.Longfellow, D.Weisshaar, A.Gade, B.A.Brown, D.Bazin, K.W.Brown, B.Elman, J.Pereira, D.Rhodes, M.Spieker

Shape Changes in the N = 28 Island of Inversion: Collective Structures Built on Configuration-Coexisting States in 43S

NUCLEAR REACTIONS 209Bi(43S, 43S'), E=76 MeV/nucleon; measured reaction products, Eγ, Iγ. 43S; deduced γ-ray energies and intensities, J, π, B(E2) strengths. Comparison with SDPF-U and SDPF-MU shell-model calculations.

doi: 10.1103/PhysRevLett.125.232501
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2020MA25      Phys.Rev. C 101, 064312 (2020)

A.Magilligan, B.A.Brown

New isospin-breaking "USD" Hamiltonians for the sd shell

NUCLEAR STRUCTURE 17,18,19,20,21,22,23,24,25,26O, 17,18,19,20,21,22,23,24,25,26F, 18,19,20,21,22,23,24,25,26,27,28Ne, 19,20,21,22,23,24,25,26,27,28,29Na, 20,21,22,23,24,25,26,27,28,29,30Mg, 23,24,25,26,27,28,29,30,31,32,33Al, 24,25,26,27,28,29,30,31,32,33,34Si, 27,28,29,30,31,32,33,34,35P, 28,29,30,31,32,33,34,35,36S, 31,32,33,34,35,36,37Cl, 32,33,34,35,36,37,38Ar, 35,36,37,38,39K, 36,37,38,39Ca; calculated two-body matrix elements (TBME) in T=0 and 1 isospin formalisms, Thomas-Ehrman shifts as a function of S(p), coefficients for the lowest lying triplets, quartets, and quintets for the IMMEs in the sd shell ground state binding energies, proton-drip line, S(p), S(2p), S(n) using two universal sd shell Hamiltonians with Coulomb and isospin symmetry-breaking interactions. Developed four new "USD" interactions of two kinds, USDC and USDI for precise predictions of isospin mixing in low-lying states, and USDCm and USDIm for mirror energy differences. Comparison with experimental data, and with 2016 atomic mass evaluation. 31Ar; calculated S(2p) and compared with experimental value. 31S, 32S; calculated isospin-mixing matrix elements between the sixth and eighth 3/2+ sd-shell levels in 31S, and the second and third 1+ sd-shell levels in 32S.

doi: 10.1103/PhysRevC.101.064312
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2020ME06      Phys.Rev. C 101, 052801 (2020)

Z.Meisel, S.George, S.Ahn, D.Bazin, B.A.Brown, J.Browne, J.F.Carpino, H.Chung, R.H.Cyburt, A.Estrade, M.Famiano, A.Gade, C.Langer, M.Matos, W.Mittig, F.Montes, D.J.Morrissey, J.Pereira, H.Schatz, J.Schatz, M.Scott, D.Shapira, K.Smith, J.Stevens, W.Tan, O.Tarasov, S.Towers, K.Wimmer, J.R.Winkelbauer, J.Yurkon, R.G.T.Zegers

Nuclear mass measurements map the structure of atomic nuclei and accreting neutron stars

ATOMIC MASSES 48,49Ar, 52,53,54,55,56,57Sc, 56,57,58,59Ti, 57,58,59,60,61,62V, 64,65Cr, 67,68Mn, 67,68,69,70Fe; measured time of flight, ΔE, Bπ, and mass excess using the A1900 fragment separator and the S800 spectrograph for particle identification at the NSCL-MSU facility; deduced S(2n), and Dn(Z, A)=S(n)(Z, A+1)-S(n)(Z, A), related to pairing gap. Comparison with available evaluated data in AME2016, and with shell model calculations using GX1A Hamiltonian for Sc isotopes. Discussion of upper-Z limit for N=34 subshell closure and lower-Z limit for N=40 subshell, and impact on electron-capture cooling in neutron star crusts. Isotopes produced in 9Be(82Se, X), E=140 MeV/nucleon reaction.

doi: 10.1103/PhysRevC.101.052801
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2020OR04      Phys.Rev. C 102, 014315 (2020)

W.E.Ormand, B.A.Brown

Microscopic calculations of nuclear level densities with the Lanczos method

NUCLEAR STRUCTURE 47,48Cr, 72,73Kr, 57Fe, 74,76Ge; calculated Hamiltonian moments, level density, and level spacing, and comparison with experimental data for 57Fe, 74,76Ge, and with other model predictions. 55,57,58,59Fe; calculated level spacings (D1) for L=1 neutron resonances and compared with experimental data. 73,74,75,77Ge; calculated level spacings (D0) for L=0 neutron resonances and compared with experimental data. 57Fe, 74,76Ge; calculated angular momenta probabilities. 74,76Ge; calculated spin cutoff parameter for positive and negative parity states. New method for calculating the density of states in nuclei using an extrapolated form of the tridiagonal matrix obtained from the Lanczos method (ELM).

doi: 10.1103/PhysRevC.102.014315
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2020RE12      Phys.Lett. B 809, 135702 (2020), Erratum Phys.Lett. B 820, 136532 (2021)

B.M.Rebeiro, S.Triambak, P.E.Garrett, B.A.Brown, G.C.Ball, R.Lindsay, P.Adsley, V.Bildstein, C.Burbadge, A.Diaz Varela, T.Faestermann, D.L.Fang, R.Hertenberger, M.Horoi, B.Jigmeddorj, M.Kamil, K.G.Leach, P.Z.Mabika, J.C.Nzobadila Ondze, J.N.Orce, H.-F.Wirth

Benchmarking 136Xe neutrinoless ββ decay matrix element calculations with the 138Ba(p, t) reaction

NUCLEAR REACTIONS 138Ba(p, t), (p, p), E=23 MeV; measured reaction products, Ep, Ip; deduced σ(θ), neutrinoless ββ decay matrix elements.

doi: 10.1016/j.physletb.2020.135702
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2020RI06      Phys.Rev. C 102, 025801 (2020)

W.A.Richter, B.A.Brown, R.Longland, C.Wrede, P.Denissenkov, C.Fry, F.Herwig, D.Kurtulgil, M.Pignatari, R.Reifarth

Shell-model studies of the astrophysical rp-process reactions 34S(p, γ)35Cl and 34g, mCl(p, γ)35Ar

NUCLEAR REACTIONS 34S(3He, d)35Cl, E=20 MeV; calculated spectroscopic factors for levels in 35Cl up to 7.4 MeV using shell model, and compared with experimental values. 34S(p, γ)35Cl, 34,34mCl(p, γ)35Ar, E not given; calculated levels, resonances, J, π, spectroscopic factors, Γp, Γγ, resonance strengths, thermonuclear reaction rates; discussed impact on predicted 34S/32S isotopic ratio for presolar nova grains. Comparison with experimental data. Shell-model approach, with uncertainties estimated using a Monte Carlo method.

doi: 10.1103/PhysRevC.102.025801
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2020SC07      Phys.Rev. C 101, 064303 (2020)

R.Schwengner, R.Massarczyk, R.Beyer, M.Bhike, B.A.Brown, Krishichayan, K.Sieja, W.Tornow, D.Bemmerer, M.Butterling, V.Derya, M.Dietz, F.Fiedler, U.Friman-Gayer, A.Frotscher, M.Grieger, A.Hartmann, A.R.Junghans, T.Kogler, F.Ludwig, B.Lutz, H.Pai, T.Szucs, M.P.Takacs, A.Wagner

Electric and magnetic dipole strength in 54Fe

NUCLEAR REACTIONS 54Fe(polarized γ, γ'), E=4.3-13.0 MeV; measured Eγ, Iγ, γ(θ), γ(polarization asymmetry), and integrated scattering cross sections, absolute photoabsorption σ(E) using HPGe detectors at the γELBE facility of the Helmholtz-Zentrum Dresden-Rossendorf (HZDR), and at the HIγS facility at TUNL. 54Fe; deduced levels, J, π, B(E1), B(M1). Comparison with shell-model predictions.

doi: 10.1103/PhysRevC.101.064303
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2020SP05      Phys.Rev.Lett. 125, 102503 (2020)

M.Spieker, A.Heusler, B.A.Brown, T.Faestermann, R.Hertenberger, G.Potel, M.Scheck, N.Tsoneva, M.Weinert, H.-F.Wirth, A.Zilges

Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in 208Pb

NUCLEAR REACTIONS 207Pb(d, p), E=22 MeV; measured reaction products, Ep, Ip; deduced σ(θ), B(E1), transition densities, Pygmy Dipole Resonance. Comparison with large-scale shell model calculations.

doi: 10.1103/PhysRevLett.125.102503
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2020SY01      Phys.Lett. B 809, 135748 (2020)

I.Syndikus, M.Petri, A.O.Macchiavelli, S.Paschalis, C.A.Bertulani, T.Aumann, H.Alvarez-Pol, L.Atar, S.Beceiro Novo, J.Benlliure, J.M.Boillos, K.Boretzky, M.J.G.Borge, B.A.Brown, M.Caamano, C.Caesar, E.Casarejos, W.Catford, J.Cederkall, S.Chakraborty, L.V.Chulkov, D.Cortina-Gil, E.Cravo, R.Crespo, U.Datta Pramanik, I.Dillmann, P.Diaz Fernandez, Z.Elekes, J.Enders, F.Farinon, L.M.Fraile, D.Galaviz, H.Geissel, R.Gernhauser, P.Golubev, K.Gobel, M.Heil, M.Heine, A.Heinz, A.Henriques, M.Holl, H.T.Johansson, B.Jonson, N.Kalantar-Nayestanaki, R.Kanungo, A.Kelic-Heil, T.Kroll, N.Kurz, C.Langer, T.Le Bleis, J.Machado, J.Marganiec-Galazka, E.Nacher, T.Nilsson, C.Nociforo, V.Panin, A.Perea, S.B.Pietri, R.Plag, A.Rahaman, R.Reifarth, A.Revel, G.Ribeiro, C.Rigollet, D.M.Rossi, D.Savran, H.Scheit, H.Simon, O.Sorlin, O.Tengblad, Y.Togano, M.Vandebrouck, V.Volkov, F.Wamers, C.Wheldon, G.L.Wilson, J.S.Winfield, H.Weick, P.Woods, D.Yakorev, M.Zhukov, A.Zilges, K.Zuber

Probing the Z=6 spin-orbit shell gap with (p, 2p) quasi-free scattering reactions

NUCLEAR REACTIONS C, H(17N, X)16C, E=438 MeV/nucleon; C, H(19N, X)18C, E=430 MeV/nucleon; C, H(21N, X)20C, E=422 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced σ, spectroscopic factors, proton component of spin-orbit splitting.

doi: 10.1016/j.physletb.2020.135748
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2019AU01      Phys.Rev. C 99, 024320 (2019)

S.M.Austin, P.Paul, B.A.Brown, V.Zelevinsky

Reactions leading to the first excited states of 7Li and 7Be and isospin-mixed states in 8Be

NUCLEAR REACTIONS 6Li(d, p), (d, n), E=0.15-7.2 MeV; 7Li(p, p'), (p, n), E=3.0-10.0 MeV; measured Eγ and Iγ from the decays of 7Li (478-keV γ) and 7Be (429-keV γ) at the Stanford 3-MeV Van de Graaff and FN Tandem accelerator; deduced ratios of σ(d, p')/σ(d, n') and σ(p, p')/σ(p, n') as function of incident deuteron and proton energies, effects of isospin mixed states in the compound nucleus. 8Be; calculated levels, J, π using shell model with PJT interaction, and compared with experimental data.

doi: 10.1103/PhysRevC.99.024320
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2019BR15      Phys.Rev. C 100, 054332 (2019)

B.A.Brown, B.Blank, J.Giovinazzo

Hybrid model for two-proton radioactivity

RADIOACTIVITY 19Mg, 45Fe, 48Ni, 54Zn, 67Kr(2p); calculated half-lives using hybrid model combining the nuclear structure part from configuration-interaction (CI) calculations and the emission dynamics from a three-body approach, with the incoherent and the coherent sum of the different amplitudes contributing to the emission process, and compared with the experimental values; compiled experimental and theoretical data in literature.

doi: 10.1103/PhysRevC.100.054332
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2019EL08      Phys.Rev. C 100, 034317 (2019)

B.Elman, A.Gade, R.V.F.Janssens, A.D.Ayangeakaa, D.Bazin, J.Belarge, P.C.Bender, B.A.Brown, C.M.Campbell, M.P.Carpenter, H.L.Crawford, B.P.Crider, P.Fallon, A.M.Forney, J.Harker, S.N.Liddick, B.Longfellow, E.Lunderberg, C.J.Prokop, J.Sethi, R.Taniuchi, W.B.Walters, D.Weisshaar, S.Zhu

Probing the role of proton cross-shell excitations in 70Ni using nucleon knockout reactions

NUCLEAR REACTIONS 9Be(71Cu, 70Ni), E=80.2 MeV/nucleon; 9Be(71Ni, 70Ni), E=82.6 MeV/nucleon; 9Be(72Zn, 70Ni), E=76.5 MeV/nucleon, [secondary 71Cu, 71Ni, 71Zn beams from 9Be(76Ge, X), E=130 MeV/nucleon primary reaction at the K500 and K1200 coupled cyclotrons of NSCL-MSU]; measured yields of reaction products, Eγ, Iγ, γγ- and (knockout residues)γ-coin using GRETINA array for γ detection, and CsI(Na) hodoscope array for reaction residues. 70Ni; deduced levels, J, π, configurations. Comparison with shell-model calculations for only the neutron excitations using the jj44pna effective interaction.

doi: 10.1103/PhysRevC.100.034317
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2019EL09      Phys.Rev. C 100, 041301 (2019)

R.Elder, H.Iwasaki, J.Ash, D.Bazin, P.C.Bender, T.Braunroth, B.A.Brown, C.M.Campbell, H.L.Crawford, B.Elman, A.Gade, M.Grinder, N.Kobayashi, B.Longfellow, A.O.Macchiavelli, T.Mijatovic, J.Pereira, A.Revel, D.Rhodes, J.A.Tostevin, D.Weisshaar

Intruder dominance in the 0+2 state of 32Mg studied with a novel technique for in-flight decays

NUCLEAR REACTIONS 9Be(34Si, 32Mg), (34Si, 31Mg), E=86 MeV/nucleon, [secondary 34Si beam from 9Be(48Ca, X), E=140 MeV/nucleon and separated using A1900 fragment separator at NSCL-MSU]; measured reaction products identified by time-of-flight and energy-loss measurements using the S800 spectrograph, Eγ, Iγ, (particle)γ-coin, level half-life for the first excited 0+ state using GRETINA array. 32Mg; deduced levels, excited 0+ level, B(E2) for excited 0+ to the first 2+ state. Comparison with B(E2) values for the first 2+ and excited 0+ states in 30,32Mg and 34Si. New method to study isomeric states decaying in-flight. Discussed collective behavior of the first excited 0+ state in 32Mg. 31Mg; deduced levels, isomer half-life.

doi: 10.1103/PhysRevC.100.041301
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2019FL06      Phys.Rev. C 99, 054332 (2019)

F.Flavigny, J.Elseviers, A.N.Andreyev, C.Bauer, V.Bildstein, A.Blazhev, B.A.Brown, H.De Witte, J.Diriken, V.N.Fedosseev, S.Franchoo, R.Gernhauser, M.Huyse, S.Ilieva, S.Klupp, Th.Kroll, R.Lutter, B.A.Marsh, D.Mucher, K.Nowak, T.Otsuka, J.Pakarinen, N.Patronis, R.Raabe, F.Recchia, P.Reiter, T.Roger, S.Sambi, M.Seidlitz, M.D.Seliverstov, B.Siebeck, Y.Tsunoda, P.Van Duppen, M.Vermeulen, M.Von Schmid, D.Voulot, N.Warr, F.Wenander, K.Wimmer

Microscopic structure of coexisting 0+ states in 68Ni probed via two-neutron transfer

NUCLEAR REACTIONS 3H(66Ni, p)68Ni, E=2.6 MeV/nucleon; measured Ep, Ip, Eγ, Iγ, pγ-coin, differential σ(θ) distributions of transfer to ground state, first excited 0+ and first 2+ states in 68Ni using the T-REX silicon particle detector array for light charged recoil detection and the Miniball detector array for γ detection at ISOLDE-CERN. 68Ni; deduced levels, L-transfer, neutron and proton average orbital occupancies of ground state, excited 0+ state, and the first 2+ state. DWBA analysis of angular distributions using the FRESCO code. Comparison with shell model calculations with the A3DA-m and the JJ44pna interaction. Discussed feeding of the 0+ states by the transfer of neutrons mainly filling the N=40 subshell closure for the ground state.

doi: 10.1103/PhysRevC.99.054332
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2019GA15      Phys.Rev.Lett. 122, 222501 (2019)

A.Gade, B.A.Brown, J.A.Tostevin, D.Bazin, P.C.Bender, C.M.Campbell, H.L.Crawford, B.Elman, K.W.Kemper, B.Longfellow, E.Lunderberg, D.Rhodes, D.Weisshaar

Is the Structure of 42Si Understood?

NUCLEAR REACTIONS 9Be(43P, 42Si), E=140 MeV/nucleon; measured reaction products, Eγ, Iγ. 42Si; deduced γ-ray energies, partial proton removal σ. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.122.222501
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2019GO34      Acta Phys.Pol. B50, 399 (2019)

T.Goigoux, P.Ascher, B.Blank, M.Gerbaux, J.Giovinazzo, S.Grevy, T.Kurtukian Nieto, C.Magron, D.S.Ahn, P.Doornenbal, N.Fukuda, N.Inabe, G.Kiss, T.Kubo, S.Kubono, S.Nishimura, H.Sakurai, Y.Shimizu, C.Sidong, P.-A.Soderstrom, T.Sumikama, H.Suzuki, H.Takeda, P.Vi, J.Wu, Y.Fujita, M.Tanaka, J.Agramunt, A.Algora, V.Guadilla, A.Montaner-Piza, A.I.Morales, S.E.A.Orrigo, B.Rubio, W.Gelletly, P.Aguilera, F.Molina, F.Diel, D.Lubos, G.de Angelis, D.Napoli, C.Borcea, A.Boso, R.B.Cakirli, E.Ganioglu, J.Chiba, D.Nishimura, H.Oikawa, Y.Takei, S.Yagi, K.Wimmer, G.De France, S.Go, B.A.Brown

67Kr Two-proton Radioactivity: Results and Theoretical Interpretations

RADIOACTIVITY 67Kr(2p)[from 9Be(78Kr, X), E=350 MeV/nucleon, followed by separation of fragments using BigRIPS and Zero Degree Spectrometer at RIBF-RIKEN]; measured E(p), I(p), half-life of decay of 67Kr from time distribution of (fragment)(decay events) correlations using EURICA-WAS3ABi setup at RIKEN. 67Kr; deduced %2p, Nilsson configurations. Comparison with theoretical calculations. 59Ge, 63Se, 68Kr; isotopes observed in A/Q versus Z identification plot.

doi: 10.5506/aphyspolb.50.399
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2019HE07      Phys.Rev. C 99, 054313 (2019)

J.Henderson, C.Y.Wu, J.Ash, B.A.Brown, P.C.Bender, R.Elder, B.Elman, A.Gade, M.Grinder, H.Iwasaki, B.Longfellow, T.Mijatovic, D.Rhodes, M.Spieker, D.Weisshaar

Triaxiality in selenium-76

NUCLEAR REACTIONS 208Pb(76Se, 76Se'), E=3.55, 4.07 MeV/nucleon; measured scattered beam- and target-like nuclei, Eγ, Iγ, (particle)γ-coin using the JANUS silicon detector array for Coulomb excitation and SeGA array for γ detection at the NSCL-MSU facility. 76Se; deduced levels, Coulomb excitation yields, reduced E2 and M1 matrix elements, B(E2), B(M1), spectroscopic quadrupole moments. GOSIA least-squares fit analysis. Systematics of <Q2> and <δ> experimental and theoretical values for 74,76,78,80,82Se. Comparison with previous experimental data, and with shell model calculations using jj44b and JUN45 interactions.

doi: 10.1103/PhysRevC.99.054313
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2019KA44      Phys.Lett. B 797, 134803 (2019)

D.Kahl, P.J.Woods, T.Poxon-Pearson, F.M.Nunes, B.A.Brown, H.Schatz, T.Baumann, D.Bazin, J.A.Belarge, P.C.Bender, B.Elman, A.Estrade, A.Gade, A.Kankainen, C.Lederer-Woods, S.Lipschutz, B.Longfellow, S.-J.Lonsdale, E.Lunderberg, F.Montes, W.J.Ong, G.Perdikakis, J.Pereira, C.Sullivan, R.Taverner, D.Weisshaar, R.Zegers

Single-particle shell strengths near the doubly magic nucleus 56Ni and the 56Ni(p, γ)57Cu reaction rate in explosive astrophysical burning

NUCLEAR REACTIONS 2H(56Ni, n), (56Ni, p), E=33.6 MeV/nucleon; measured reaction products, Eγ, Iγ. 57Cu; deduced σ, spectroscopic factors, resonance parameters, astrophysical reaction rates.

doi: 10.1016/j.physletb.2019.134803
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2019KI08      Phys.Rev.Lett. 123, 262701 (2019)

O.S.Kirsebom, S.Jones, D.F.Stromberg, G.Martinez-Pinedo, K.Langanke, F.K.Ropke, B.A.Brown, T.Eronen, H.O.U.Fynbo, M.Hukkanen, A.Idini, A.Jokinen, A.Kankainen, J.Kostensalo, I.Moore, H.Moller, S.T.Ohlmann, H.Penttila, K.Riisager, S.Rinta-Antila, P.C.Srivastava, J.Suhonen, W.H.Trzaska, J.Aysto

Discovery of an Exceptionally Strong β-Decay Transition of 20F and Implications for the Fate of Intermediate-Mass Stars

RADIOACTIVITY 20F(β-) [from 19F(d, X), E=6 MeV]; measured decay products, Eβ, Iβ; deduced transition strength.

doi: 10.1103/PhysRevLett.123.262701
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2019KL06      Phys.Rev. C 99, 061301 (2019)

A.Klose, K.Minamisono, A.J.Miller, B.A.Brown, D.Garand, J.D.Holt, J.D.Lantis, Y.Liu, B.Maass, W.Nortershauser, S.V.Pineda, D.M.Rossi, A.Schwenk, F.Sommer, C.Sumithrarachchi, A.Teigelhofer, J.Watkins

Ground-state electromagnetic moments of 37Ca

NUCLEAR MOMENTS 37,39Ca; measured hyperfine structure spectra using the collinear laser spectroscopy technique at NSCL-BECOLA facility; deduced hyperfine coupling constants, and isoscalar- and isovector-magnetic moment of the ground states. 37,39Ca produced in 9Be(40Ca, X), E=140 MeV/nucleon reaction, and separation of fragments using A1900 fragment separator at NSCL-MSU. Comparison with shell model calculations using the universal sd model-space Hamiltonians (USDA/B). Systematics of experimental and theoretical magnetic moments of ground states of 37,39Ca, 37Cl and 39K.

doi: 10.1103/PhysRevC.99.061301
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2019LO06      Phys.Rev. C 99, 064330 (2019)

B.Longfellow, A.Gade, B.A.Brown, D.Bazin, P.C.Bender, M.Bowry, P.D.Cottle, B.Elman, E.Lunderberg, A.Magilligan, M.Spieker, D.Weisshaar, S.J.Williams

Spectroscopy and lifetime measurements near the proton drip line: 26, 27, 28P

NUCLEAR REACTIONS 9Be(26Si, 26P), (27P, 26P), (28S, 26P), (26Si, 27P), (30S, 27P), (34Ar, 27P), (29P, 28P), (34Ar, 28P), (33Cl, 28P), (30S, 28P), (28Si, 27Si), E=118 MeV/nucleon, [secondary beams from 9Be(36Ar, X), E=150 MeV/nucleon primary beam, followed by fragment separation by A1900 fragment separator at NSCL-MSU facility]; measured reaction products, particle identification plot, Eγ, Iγ using CEASAR and SeGA arrays for γ detection and the S800 spectrograph focal plane detectors for charged particle identification. 26,27,28P, 27Si; deduced levels, J, π, level half-lives; calculated Thomas-Ehrman shifts applied to energies in mirror nuclei. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.99.064330
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2019LY02      Phys.Rev. C 100, 025806 (2019)

S.Lyons, A.Spyrou, S.N.Liddick, F.Naqvi, B.P.Crider, A.C.Dombos, D.L.Bleuel, B.A.Brown, A.Couture, L.Crespo Campo, J.Engel, M.Guttormsen, A.C.Larsen, R.Lewis, P.Moller, S.Mosby, M.R.Mumpower, E.M.Ney, A.Palmisano, G.Perdikakis, C.J.Prokop, T.Renstrom, S.Siem, M.K.Smith, S.J.Quinn

69, 71Co β-decay strength distributions from total absorption spectroscopy

RADIOACTIVITY 69,71Co(β-)[from 9Be(86Kr, X), E=140 MeV/nucleon, followed by in flight separation of fragments by the A1900 fragment separator at NSCL-MSU]; measured Eγ, Iγ, Eβ, βγ-coin, half-lives of decays of 69,71Co decays, total absorption spectra using Summing NaI(Tl) (SuN) detector for γ rays and double-sided silicon strip detector (DSSD) for β; deduced cumulative Iβ distributions and compared to QRPA and Skyrme QRPA calculations, Gamow-Teller (GT) strength distribution. Comparison of decay half-lives with ENSDF values, and theoretical calculations using shell mode, QRPA and Skyrme QRPA. Relevance to r process in nucleosynthesis.

doi: 10.1103/PhysRevC.100.025806
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2019MC05      Phys.Rev. C 100, 044317 (2019)

B.P.McCormick, A.E.Stuchbery, B.A.Brown, G.Georgiev, B.J.Coombes, T.J.Gray, M.S.M.Gerathy, G.J.Lane, T.Kibedi, A.J.Mitchell, M.W.Reed, A.Akber, L.J.Bignell, J.T.H.Dowie, T.K.Eriksen, S.Hota, N.Palalani, T.Tornyi

First-excited state g factors in the stable, even Ge and Se isotopes

NUCLEAR MOMENTS 70,72,74,76Ge, 74,76,78,80,82Se; measured Eγ, scattered carbon particles, (particle)γ-coin, angular correlations, transient-field precession angles, relative g factors of the first 2+ states using transient field (TF) method in inverse kinematics with the Rutgers parameterization, and ion beams of Ge and Se isotopes from the Australian National University 14UD Pelletron accelerator incident on a multilayer target of C layer, an iron or gadolinium foil, and a copper backing; deduced g factors for the Se and Ge isotopes from a global fit to the present data, together with previous g-factor ratios. Comparison with shell-model calculations using JUN45 and jj44b interactions.

doi: 10.1103/PhysRevC.100.044317
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2019MU04      Phys.Rev. C 99, 014313 (2019)

S.Mukhopadhyay, B.P.Crider, B.A.Brown, A.Chakraborty, A.Kumar, M.T.McEllistrem, E.E.Peters, F.M.Prados-Estevez, S.W.Yates

Inelastic neutron scattering studies of 76Se

NUCLEAR REACTIONS 76Se(n, n'), E=2.0-3.5 MeV; measured Eγ, Iγ, γ(θ), level half-lives by DSAM, cross section for the population of 2604 keV, 0+ state at the University of Kentucky Accelerator Laboratory (UKAL). 76Se; deduced levels, J, π, branching ratios, multipole mixing ratios, B(E2), B(M1), B(E1) and B(E3). Comparison with large-scale shell model, and the interacting boson model calculations, and with previous experimental data. Comparison of σ for 2604-keV state with theoretical cross sections calculated with the code CINDY. Systematics of low-lying positive-parity band structures and E2 transition strengths in 74,76Ge, 76Se, 78Kr.

doi: 10.1103/PhysRevC.99.014313
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2019RI03      Phys.Rev. C 100, 044312 (2019); Erratum Phys.Rev. C 101, 059902 (2020)

L.A.Riley, D.Bazin, J.Belarge, P.C.Bender, B.A.Brown, P.D.Cottle, B.Elman, A.Gade, S.D.Gregory, E.B.Haldeman, K.W.Kemper, B.R.Klybor, M.A.Liggett, S.Lipschutz, B.Longfellow, E.Lunderberg, T.Mijatovic, J.Pereira, L.M.Skiles, R.Titus, A.Volya, D.Weisshaar, J.C.Zamora, R.G.T.Zegers

Inverse-kinematics proton scattering from 42, 44S, 41, 43P, and the collapse of the N=28 major shell closure

NUCLEAR REACTIONS 1H(42S, 42S'), E=62 MeV/nucleon; 1H(44S, 44S'), E=70 MeV/nucleon; 1H(41P, 41P'), E=58 MeV/nucleon; 1H(43P, 43P'), E=65 MeV/nucleon, [secondary 42,44S, 41,43P beams from 9Be(48Ca, X), E=140 MeV/nucleon followed by separation using A1900 fragment separator at NSCL-MSU]; measured reaction products, Eγ, Iγ, (particle)γ-coin using S-800 high resolution magnetic spectrograph, and GRETINA array. 42,44S, 41,43P; deduced levels, J, π, scattering σ, deformation lengths and ratio of neutron-to-proton transition matrix elements for 42,44S. Optical model analysis. Comparison with shell-model calculations using SDPF-U and SDPF-MU interactions, and with previous experimental results. Systematics of deformation lengths in 36,38,40,42,44S. Systematics of ratios of neutron to proton transition matrix elements in 42,44,48,50Ca, 40,42,44,46Ar, 36,38,40,42,44,46S, 36,38Si.

doi: 10.1103/PhysRevC.100.044312
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2019SP02      Phys.Rev. C 99, 051304 (2019)

M.Spieker, A.Gade, D.Weisshaar, B.A.Brown, J.A.Tostevin, B.Longfellow, P.Adrich, D.Bazin, M.A.Bentley, J.R.Brown, C.M.Campbell, C.Aa.Diget, B.Elman, T.Glasmacher, M.Hill, B.Pritychenko, A.Ratkiewicz, D.Rhodes

One-proton and one-neutron knockout reactions from N = Z = 28 56Ni to the A = 55 mirror pair 55Co and 55Ni

NUCLEAR REACTIONS 9Be(56Ni, 55Co), (56Ni, 55Ni), E=85.9 MeV/nucleon, [secondary 56Ni beam from 9Be(58Ni, X), E=160 MeV/nucleon primary reaction, followed by separation using A1900 fragment separator]; measured Eγ, Iγ, partial σ, and parallel momentum distributions using SeGA array for γ detection, and S800 magnetic spectrograph for knockout residues at the NSCL-MSU facility. 55Co, 55Ni; deduced levels, J, π, mirror energy differences (MEDs) between 55Co and 55Ni, configurations. Comparison with large scale shell model calculations.

doi: 10.1103/PhysRevC.99.051304
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2019SP06      Phys.Rev. C 100, 061303 (2019)

M.Spieker, D.Weisshaar, A.Gade, B.A.Brown, P.Adrich, D.Bazin, M.A.Bentley, J.R.Brown, C.M.Campbell, C.Aa.Diget, B.Elman, T.Glasmacher, M.Hill, B.Longfellow, B.Pritychenko, A.Ratkiewicz, D.Rhodes, J.A.Tostevin

Experimental identification of the T=1, Jπ=6+ state of 54Co and isospin symmetry in A=54 studied via one-nucleon knockout reactions

NUCLEAR REACTIONS 9Be(55Co, 54Co), (55Co, 54Fe), E not given, [secondary 55Co beam from 9Be(58Ni, X), E=160 MeV/nucleon, followed by separation of 55Co using A1900 fragment separator at NSCL-MSU]; measured projectile-like reaction residues, Eγ, Iγ, (particle)γ-coin using the S800 spectrograph for particles and SeGA array for γ rays. 54Co, 54Fe; deduced levels, J, π, cross sections for population of levels. Comparison with large-scale-shell-model (LSSM) calculations; investigated possible isospin-symmetry breaking in the A=54, T=1 triplet through the isobaric mass multiplet equation (IMME).

doi: 10.1103/PhysRevC.100.061303
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2019SW04      Phys.Rev. C 100, 034323 (2019)

C.Sword, J.Brett, T.Baumann, B.A.Brown, N.Frank, J.Herman, M.D.Jones, H.Karrick, A.N.Kuchera, M.Thoennessen, J.A.Tostevin, M.Tuttle-Timm, P.A.DeYoung

Observation of three-neutron sequential emission from 25O*

NUCLEAR REACTIONS 2H(27Ne, 2p)25O*, E=101.3 MeV/nucleon, [secondary 27Ne beam mixed with other light nuclei from fragmentation of 140 MeV/nucleon 48Ca primary beam from the Coupled Cyclotron Facility, and separated by A1900 Fragment Separator at NSCL-MSU]; measured E(n), 22O fragments, (22O)n-coin, four-body (22O+3n), three-body (22O+2n), and two-body (22O+1n) ungated and gated decay-energy and hit-multiplicity spectra using the Modular Neutron Array (MoNA) and Large multi-Institutional Scintillator Array (LISA); deduced mass of 25O from the invariant of the sum of the energy-momentum four-vectors of an 22O fragment and the three associated neutrons emitted from the excited states of 25O. 25O; deduced neutron-unbound levels, resonances, decay via three-neutron sequential emission to levels in 24O, 23O and 22O. Comparison with shell-model and eikonal calculations for two-proton removal reaction from 27Ne.

NUCLEAR STRUCTURE 23,24,25O; calculated levels using Gamow shell model with the density-matrix renormalization-group (GSM-DMRG) method, and a continuum shell model (CSM). Comparison with experimental data.

doi: 10.1103/PhysRevC.100.034323
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2019TI09      Phys.Rev. C 100, 045805 (2019)

R.Titus, E.M.Ney, R.G.T.Zegers, D.Bazin, J.Belarge, P.C.Bender, B.A.Brown, C.M.Campbell, B.Elman, J.Engel, A.Gade, B.Gao, E.Kwan, S.Lipschutz, B.Longfellow, E.Lunderberg, T.Mijatovic, S.Noji, J.Pereira, J.Schmitt, C.Sullivan, D.Weisshaar, J.C.Zamora

Constraints for stellar electron-capture rates on 86Kr via the 86Kr(t, 3He+γ)86Br reaction and the implications for core-collapse supernovae

NUCLEAR REACTIONS 86Kr, 12C, 14N(t, 3He), E=115 MeV/nucleon, [tritons from 9Be(16O, X), E=150 MeV/nucleon primary reaction, and separated using A1900 fragment separator]; measured 3He spectra, Eγ, Iγ, γγ- and (3He)γ-coin, differential σ(θ) using S800 spectrograph for particles and GRETINA array for γ detection at the NSCL-MSU facility. Data from 12C 14N present as contaminants used for energy calibration. 86Br; deduced levels, L-transfers, Gamow-Teller strength distributions. 86Kr; calculated electron capture rates at T=10 GK using the deduced Gamow-Teller strength distributions. Comparison with shell-model and quasiparticle random-phase approximation (QRPA) calculations. Z=26-41, N=75-93; calculated electron capture rates for 78 nuclides near N=50 and Z=28 (see 2018Ti02) using quasiparticle random-phase approximation (QRPA), with Jπ assignments made for ground states of some nuclides using Gallagher-Moszkowski (GM) rule. Relevance to astrophysical simulations of core-collapse supernovae.

doi: 10.1103/PhysRevC.100.045805
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2019TS08      Phys.Rev. C 100, 062801 (2019)

C.Y.Tsang, B.A.Brown, F.J.Fattoyev, W.G.Lynch, M.B.Tsang

Constraints on Skyrme equations of state from doubly magic nuclei, ab initio calculations of low-density neutron matter, and neutron stars

doi: 10.1103/PhysRevC.100.062801
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2019WO01      Phys.Rev.Lett. 122, 232701 (2019)

C.Wolf, C.Langer, F.Montes, J.Pereira, W.-J.Ong, T.Poxon-Pearson, S.Ahn, S.Ayoub, T.Baumann, D.Bazin, P.C.Bender, B.A.Brown, J.Browne, H.Crawford, R.H.Cyburt, E.Deleeuw, B.Elman, S.Fiebiger, A.Gade, P.Gastis, S.Lipschutz, B.Longfellow, Z.Meisel, F.M.Nunes, G.Perdikakis, R.Reifarth, W.A.Richter, H.Schatz, K.Schmidt, J.Schmitt, C.Sullivan, R.Titus, D.Weisshaar, P.J.Woods, J.C.Zamora, R.G.T.Zegers

Constraining the Neutron Star Compactness: Extraction 23Al(p, γ) Reaction Rate for the rp Process

NUCLEAR REACTIONS 2H(23Al, n), E=48 MeV/nucleon; measured reaction products, En, In, Eγ, Iγ; deduced J, π, σ, σ(θ), resonance widths and spectroscopic strengths, reaction rates.

doi: 10.1103/PhysRevLett.122.232701
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2019ZA07      Phys.Rev. C 100, 032801(R) (2019)

J.C.Zamora, R.G.T.Zegers, SamM.Austin, D.Bazin, B.A.Brown, P.C.Bender, H.L.Crawford, J.Engel, A.Falduto, A.Gade, P.Gastis, B.Gao, T.Ginter, C.J.Guess, S.Lipschutz, B.Longfellow, A.O.Macchiavelli, K.Miki, E.Ney, S.Noji, J.Pereira, J.Schmitt, C.Sullivan, R.Titus, D.Weisshaar

Experimental constraint on stellar electron-capture rates from the 88Sr(t, 3He + γ) 88Rb reaction at 115 MeV/u

NUCLEAR REACTIONS 88Sr(t, 3He)88Rb, E=115 MeV/nucleon, [secondary triton beam from 9Be(16O, X), E=150 MeV/nucleon using Coupled Cyclotron Facility and A1900 fragment separator at NSCL-MSU]; measured 3He ejectiles, angular distributions using S800 spectrograph, and Eγ, Iγ using GRETINA array; deduced double-differential cross sections, L-transfers from fitting of the σ(θ) distributions in the multipole decomposition analysis (MDA), two-dimensional histogram of γ-ray energy versus excitation energy of 88Rb. 88Sr; deduced B(GT) strength distributions, electron capture (EC) rates on 88Sr as a function of stellar density at a temperature of 10 GK. 86,87,88Rb; deduced transitions. 12C(t, 3He)12B, E=115 MeV/nucleon; measured 3He ejectiles, reaction used for calibration and for absolute measurement of the triton beam intensity. Comparison of experimental EC rates on 88Sr with shell model and QRPA calculations. Relevance to the late evolution of core-collapse supernovae.

doi: 10.1103/PhysRevC.100.032801
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2018AB06      Phys.Rev. C 98, 024309 (2018)

E.Aboud, M.B.Bennett, C.Wrede, M.Friedman, S.N.Liddick, D.Perez-Loureiro, D.W.Bardayan, B.A.Brown, A.A.Chen, K.A.Chipps, C.Fry, B.E.Glassman, C.Langer, E.I.McNeice, Z.Meisel, W.-J.Ong, P.D.O'Malley, S.D.Pain, C.J.Prokop, H.Schatz, S.B.Schwartz, S.Suchyta, P.Thompson, M.Walters, X.Xu

Toward complete spectroscopy using β decay: The example of 32Cl (βγ)32S

RADIOACTIVITY 32Cl(β+), (EC)[from 9Be(36Ar, X), E=150 MeV/nucleon followed by beam separation and purification using A1900 fragment separator and time-of-flight separation method using Radio Frequency Fragment Separator (RFFS) at NSCL-MSU]; measured Eγ, Iγ, βγ- and βγγ-coin using the Clovershare array of HPGe detectors, 32Cl implants and β by a plastic scintillator at NSCL-MSU. 32S; deduced levels, J, π, β feedings, logft, Gamow-Teller strengths, half-lives, proton, γ and α widths of 8861- and 9650-keV resonances. Comparison with sd USDA and USDB shell model calculations, and with previous experimental values and ENSDF evaluations. 31P(p, α)28Si, E=9650 keV; deduced resonance strength.

doi: 10.1103/PhysRevC.98.024309
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2018BE12      Phys.Rev. C 97, 065803 (2018)

M.B.Bennett, C.Wrede, S.N.Liddick, D.Perez-Loureiro, D.W.Bardayan, B.A.Brown, A.A.Chen, K.A.Chipps, C.Fry, B.E.Glassman, C.Langer, N.R.Larson, E.I.McNeice, Z.Meisel, W.Ong, P.D.O'Malley, S.D.Pain, C.J.Prokop, H.Schatz, S.B.Schwartz, S.Suchyta, P.Thompson, M.Walters, X.Xu

Detailed study of the decay 31Cl(βγ)31S

RADIOACTIVITY 31Cl(β+), (EC)[from 9Be(36Ar, X), E=150 MeV/nucleon using A1900 Fragment Separator for Bρ, and Radio Frequency Fragment Separator (RFFS) for TOF at NSCL-MSU facility]; measured Eγ, Iγ, βγ- and βγγ-coin using Yale Clovershare array for γ detection, and plastic scintillator for β detection. 31S; deduced levels, resonances, J, π, β feedings, logft values, isospin mixing, ratio of thermonuclear reaction rates for 30P(p, γ)31S reaction at T9=0.1-0.4 for the newly discovered state at 6390 keV and the IAS at 6280 keV. Comparison with USDB and USDE shell-model calculations, and previous experimental results.

doi: 10.1103/PhysRevC.97.065803
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2018BR04      Phys.Lett. B 778, 155 (2018)

J.Bradt, Y.Ayyad, D.Bazin, W.Mittig, T.Ahn, S.Beceiro Novo, B.A.Brown, L.Carpenter, M.Cortesi, M.P.Kuchera, W.G.Lynch, S.Rost, N.Watwood, J.Yurkon, J.Barney, U.Datta, J.Estee, A.Gillibert, J.Manfredi, P.Morfouace, D.Perez-Loureiro, E.Pollacco, J.Sammut, S.Sweany

Study of spectroscopic factors at N = 29 using isobaric analogue resonances in inverse kinematics

NUCLEAR REACTIONS 1H(46Ar, X), E<140 MeV/nucleon; measured reaction products, Ep, Ip. 46,47Ar, 47K; deduced energy levels, J, π, resonance widths. Comparison with R-matrix calculations.

doi: 10.1016/j.physletb.2018.01.015
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2018BR15      Phys.Rev. C 98, 024324 (2018)

R.Broda, L.W.Iskra, R.V.F.Janssens, B.A.Brown, B.Fornal, J.Wrzesinski, N.Cieplicka-Orynczak, M.P.Carpenter, C.J.Chiara, C.R.Hoffman, F.G.Kondev, G.J.Lane, T.Lauritsen, Zs.Podolyak, D.Seweryniak, W.B.Walters, S.Zhu

Two-neutron and core-excited states in 210Pb: Tracing E collectivity and evidence for a new β-decaying isomer in 210Tl

NUCLEAR REACTIONS 208Pb(208Pb, X)210Pb, E=1440 MeV; 208Pb(48Ca, X)210Pb, 208Pb(76Ge, X)210Pb, 208Pb(82Se, X)210Pb, 238U(48Ca, X)210Pb, 238U(208Pb, X)210Pb, E=15-25% above the respective Coulomb barriers; measured Eγ, Iγ, delayed γ spectra, γγ-coin, γ(θ), half-lives of isomers and levels by γγ(t), ratio of observed production yields of anticipated 11+ β--decaying isomer in 210Tl and the 8+ isomer in 210Pb using Gammasphere array at ATLAS-ANL facility. 210Pb; deduced high-spin levels, isomers, J, π, conversion coefficients, multipolarities, configurations, B(E2), B(E3). 210Tl; deduced possible 11+ β- decaying isomer. Comparison with large-scale shell model calculations.

NUCLEAR STRUCTURE 210Pb, 210Tl; calculated levels, J, π by large-scale shell model calculations, and compared with experimental data.

doi: 10.1103/PhysRevC.98.024324
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2018DI14      Phys.Rev. C 98, 054314 (2018)

B.Dietz, B.A.Brown, U.Gayer, N.Pietralla, V.Yu.Ponomarev, A.Richter, P.C.Ries, V.Werner

Chaos and regularity in the spectra of the low-lying dipole excitations of 50, 52, 54Cr

NUCLEAR STRUCTURE 50,52,54Cr; analyzed experimental B(M1) strengths for 1+ states from orbital magnetic-dipole scissors mode, and sizable spin-flip magnetic-dipole strength, and experimental B(E1) strengths for 1- states belonging to the pygmy dipole resonances (PDRs) through random matrix theory (RMT) to analyze fluctuation properties in the subspectra of the energy levels; deduced Gaussian orthogonal ensemble (GOE) for 1+ states, and nearly Poissonian behavior for the 1- states, suggesting collective behavior of the PDRs. Relevance to nuclear resonance fluorescence experiments at the Superconducting Darmstadt Electron Linear Accelerator (S-DALINAC), and the high intensity γ-ray source (HIγS) of the Triangle Universities Nuclear Laboratory (TUNL).

doi: 10.1103/PhysRevC.98.054314
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2018EV01      Phys.Lett. B 779, 396 (2018)

L.J.Evitts, A.B.Garnsworthy, T.Kibedi, J.Smallcombe, M.W.Reed, B.A.Brown, A.E.Stuchbery, G.J.Lane, T.K.Eriksen, A.Akber, B.Alshahrani, M.de Vries, M.S.M.Gerathy, J.D.Holt, B.Q.Lee, B.P.McCormick, A.J.Mitchell, M.Moukaddam, S.Mukhopadhyay, N.Palalani, T.Palazzo, E.E.Peters, A.P.D.Ramirez, S.R.Stroberg, T.Tornyi, S.W.Yates

Identification of significant E0 strength in the 2+2 → 2+1 transitions of 58, 60, 62Ni

NUCLEAR REACTIONS 58,60,62Ni(p, p'), E<9.2 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies and intensities, nuclear and quadrupole moments, B(E2), B(M1). Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2018.01.076
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2018GA22      Acta Phys.Pol. B49, 229 (2018)

P.E.Garrett, K.G.Leach, A.D.MacLean, G.C.Ball, P.C.Bender, V.Bildstein, B.A.Brown, C.Burbadge, A.Diaz Varela, R.Dunlop, T.Faestermann, B.Hadinia, R.Hertenberger, J.D.Holt, A.T.Laffoley, D.S.Jamieson, B.Jigmeddorj, A.J.Radich, E.T.Rand, S.R.Stroberg, C.E.Svensson, I.S.Towner, S.Triambak, H.-F.Wirth

Nuclear Structure Studied with Direct Reactions for Fundamental Symmetry Tests

NUCLEAR REACTIONS 52Cr(p, t)50Cr;64Zn(p, t)62Zn, E=24 MeV; measured reaction products momenta using Q3D magnetic spectrograph, Eγ, Iγ, γγ-coin; deduced peaks in triton spectra, σ(θ) vs θcm for reactions to given final states, angular correlation measurement of 1389-954 keV cascade in 62Zn following the β+/EC decay of 62Ga (preliminary).

doi: 10.5506/APhysPolB.49.229
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