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NSR database version of March 18, 2024.

Search: Author = D.Weisshaar

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2024HE01      Phys.Rev. C 109, 014327 (2024)

J.Heery, J.Henderson, C.R.Hoffman, A.M.Hill, T.Beck, C.Cousins, P.Farris, A.Gade, S.A.Gillespie, J.D.Holt, B.Hu, H.Iwasaki, S.Kisyov, A.N.Kuchera, B.Longfellow, C.Muller-Gatermann, A.Poves, E.Rubino, R.Russell, R.Salinas, A.Sanchez, D.Weisshaar, C.Y.Wu, J.Wu

Suppressed electric quadrupole collectivity in 32Si

doi: 10.1103/PhysRevC.109.014327
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2024SP01      Phys.Rev. C 109, 014307 (2024)

M.Spieker, D.Bazin, S.Biswas, P.D.Cottle, P.J.Farris, A.Gade, T.Ginter, S.Giraud, K.W.Kemper, J.Li, S.Noji, J.Pereira, L.A.Riley, M.K.Smith, D.Weisshaar, R.G.T.Zegers

Proton removal from 73, 75Br to 72, 74Se at intermediate energies

doi: 10.1103/PhysRevC.109.014307
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2024TA07      Phys.Rev.Lett. 132, 072501 (2024)

O.B.Tarasov, A.Gade, K.Fukushima, M.Hausmann, E.Kwan, M.Portillo, M.Smith, D.S.Ahn, D.Bazin, R.Chyzh, S.Giraud, K.Haak, T.Kubo, D.J.Morrissey, P.N.Ostroumov, I.Richardson, B.M.Sherrill, A.Stolz, S.Watters, D.Weisshaar, T.Zhang

Observation of New Isotopes in the Fragmentation of 198Pt at FRIB

NUCLEAR REACTIONS C(198Pt, X)182Tm/183Tm/186Yb/187Yb/190Lu, E=186 MeV/nucleon; measured reaction products, TOF; deduced new isotopes, yields. The Facility for Rare Isotope Beams (FRIB) using the Advanced Rare Isotope Separator (ARIS).

doi: 10.1103/PhysRevLett.132.072501
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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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2023BO18      Phys.Rev. C 108, 034604 (2023)

M.Bowry, O.B.Tarasov, J.S.Berryman, V.Bader, D.Bazin, T.Chupp, H.L.Crawford, A.Gade, E.Lunderberg, A.Ratkiewicz, F.Recchia, B.M.Sherrill, D.Smalley, A.Stolz, S.R.Stroberg, D.Weisshaar, S.Williams, K.Wimmer, J.Yurkon

Abrasion-fission reactions at intermediate energies

doi: 10.1103/PhysRevC.108.034604
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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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2023HA31      Phys.Rev. C 108, 034608 (2023)

K.Haak, O.B.Tarasov, P.Chowdhury, A.M.Rogers, K.Sharma, T.Baumann, D.Bazin, P.C.Bender, J.Chen, A.Estrade, M.A.Famiano, D.C.Foulds-Holt, N.Fukuda, A.Gade, T.N.Ginter, R.W.Gohier, M.Hausmann, A.M.Hill, D.E.M.Hoff, L.Klankowski, E.Kwan, J.Li, S.N.Liddick, B.Longfellow, S.Lyons, C.Morse, M.Portillo, D.Rhodes, A.L.Richard, S.Samaranayake, B.M.Sherrill, M.K.Smith, M.Spieker, C.S.Sumithrarachchi, H.Suzuki, K.Wang, S.Waniganeththi, D.Weisshaar, S.Zhu

Production and discovery of neutron-rich isotopes by fragmentation of 198Pt

NUCLEAR REACTIONS 9Be, Ni(198Pt, X)182Yb/183Lu/184Lu/185Lu/186Lu/187Lu/188Lu/189Lu/184Hf/185Hf/186Hf/187Hf/188Hf/189Hf/190Hf/191Hf/192Hf/185Ta/186Ta/187Ta/188Ta/189Ta/190Ta/191Ta/192Ta/193Ta/186W/187W/188W/189W/190W/191W/192W/193W/194W/187Re/188Re/189Re/190Re/191Re/192Re/193Re/194Re/195Re/196Re/190Os/191Os/192Os/193Os/194Os/195Os/196Os/197Os/192Ir/193Ir/194Ir/195Ir/196Ir/197Ir/198Ir, E=85 MeV/nucleon from the NSCL-MSU Coupled Cyclotron Facility (CCF); measured reaction products, particle identification spectra using A1900 fragment separator, S800 spectrograph for fragment analysis, PIN diode telescope of five silicon detectors for particle detection, γ rays using GRETINA array, and LISE+ Monte Carlo calculations of charge state fractions; deduced production cross sections of about 70 nuclei in Z=70-77 region. 189Lu, 191,192Hf; deduced new nuclides. 190W; measured γ-ray spectrum from the emission of a 166-μs isomer. Comparison of measured production cross sections with theoretical calculations using EFAX3 and COFRA codes. Numerical values of production cross sections are listed in the Supplemental Material.

doi: 10.1103/PhysRevC.108.034608
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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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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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2023RU06      Phys.Rev. C 108, 064311 (2023)

R.Russell, J.Heery, J.Henderson, C.R.Hoffman, T.Beck, C.Cousins, P.Farris, A.Gade, S.A.Gillespie, A.Hill, H.Iwasaki, S.Kisyov, A.N.Kuchera, B.Longfellow, C.Muller-Gatermann, K.Nomura, E.Rubino, R.Salinas, A.Sanchez, D.Weisshaar, C.Y.Wu, J.Wu

Coulomb excitation of 96Mo

doi: 10.1103/PhysRevC.108.064311
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2023SP02      Phys.Lett. B 841, 137932 (2023)

M.Spieker, S.E.Agbemava, D.Bazin, S.Biswas, P.D.Cottle, P.J.Farris, A.Gade, T.Ginter, S.Giraud, K.W.Kemper, J.Li, W.Nazarewicz, S.Noji, J.Pereira, L.A.Riley, M.Smith, D.Weisshaar, R.G.T.Zegers

Hexadecapole strength in the rare isotopes 74, 76Kr

NUCLEAR REACTIONS 1H(74Kr, 74Kr'), (76Kr, 76Kr'), E(cm)=100 MeV, [secondary 74,76Kr beams from 9Be(78Kr, X), E=150 MeV/nucleon primary reaction, followed by separation of fragments using A1900 separator]; measured Doppler-corrected Eγ, Iγ, (particle)γ-coin using NSCL-MSU using NSCL/Ursinus Liquid Hydrogen (LH2) Target, eight GRETINA modules of 36-fold segmented HPGe detectors for γ radiation, and S800 spectrograph for projectile-like reaction residues. 74,76Kr; deduced levels, Jπ, β2 for the first 2+ state and β4 and B(E4)(W.u.) for the first 4+ state from inelastic proton scattering experiments in inverse kinematics. Comparison to coupled-channels calculations, and nuclear density functional theory (DFT) calculations using the Skyrme SkM* and UNEDF1 energy density functionals, covariant NL3* and DD-PC1 energy density functionals. Systematics and theoretical predictions of β2, β4 and B(E4)(W.u.) for 74,76,78,80,82,84,86Kr.

doi: 10.1016/j.physletb.2023.137932
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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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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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2022KI08      Phys.Rev. C 105, 034318 (2022)

N.Kitamura, K.Wimmer, T.Miyagi, A.Poves, N.Shimizu, J.A.Tostevin, V.M.Bader, C.Bancroft, D.Barofsky, T.Baugher, D.Bazin, J.S.Berryman, V.Bildstein, A.Gade, N.Imai, T.Kroll, C.Langer, J.Lloyd, E.Lunderberg, F.Nowacki, G.Perdikakis, F.Recchia, T.Redpath, S.Saenz, D.Smalley, S.R.Stroberg, Y.Utsuno, D.Weisshaar, A.Westerberg

In-beam γ-ray spectroscopy of 32Mg via direct reactions

NUCLEAR REACTIONS 9Be(33Mg, n), E=99.6 MeV/nucleon; 9Be(34Si, 2p), E=94.8 MeV/nucleon; measured reaction products, Eγ, Iγ, γγ-coin; deduced inclusive and exclusive σ, momentum distribution, spectroscopic factors. 32Mg; deduced, levels, J, π, configurations, structure of ground-state rotational band. Comparison to shell-model calculations using SDPF-M, SDPF-U-MIX, EEdf1 and IMSRG interactions. Systematics of low-spin levels for N=20 isotones (32Mg, 34Si, 36S, 38Ar, 40Ca). GRETINA at NSCL-MSU.

doi: 10.1103/PhysRevC.105.034318
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2022KI17      Phys.Rev. C 106, 034311 (2022)

S.Kisyov, C.Y.Wu, J.Henderson, A.Gade, K.Kaneko, Y.Sun, N.Shimizu, T.Mizusaki, D.Rhodes, S.Biswas, A.Chester, M.Devlin, P.Farris, A.M.Hill, J.Li, E.Rubino, D.Weisshaar

Structure of 126, 128Xe studied in Coulomb excitation measurements

NUCLEAR REACTIONS 196Pt, 208Pb(126Xe, 126Xe'), (128Xe, 128Xe'), E(126Xe)=3.74 MeV/nucleon, E(128Xe)=3.81 MeV/nucleon; measured reaction products, Eγ, Iγ, (126Xe)γ-coin, (128Xe)γ-coin using JANUS array consisting of a pair of segmented double-sided Si detectors for particles, and SeGA array with sixteen 32-fold segmented HPGe detector for γ radiation at the NSCL-MSU facility. 126,128Xe; deduced levels, J, π, E2 matrix elements, B(E2), static quadrupole moments. GOSIA + GOSIA2 analyses; calculated Potential-energy surfaces (PES) in (Q0, Q2) plane. Comparison with PMMU shell model calculations, and with previous experimental results.

doi: 10.1103/PhysRevC.106.034311
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2022KU08      Phys.Rev. C 105, 034314 (2022)

A.N.Kuchera, D.Bazin, T.Phan, J.A.Tostevin, M.Babo, T.Baumann, P.C.Bender, M.Bowry, J.Bradt, J.Brown, P.A.DeYoung, B.Elman, J.E.Finck, A.Gade, G.F.Grinyer, M.D.Jones, B.Longfellow, E.Lunderberg, T.H.Redpath, W.F.Rogers, K.Stiefel, M.Thoennessen, D.Votaw, D.Weisshaar, K.Whitmore, R.B.Wiringa

Mirror nucleon removal reactions in p-shell nuclei

NUCLEAR REACTIONS 9Be(7Li, 6He), (7Li, 6Li), (9Li, 8Li), (10Be, 9Li) E=80 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced partial σ to the individual final states of the daughter nuclei. Comparison to fully microscopic variational Monte Carlo (VMC) model calculations. Systematics of partial σ for nucleon removal reactions in mirror pairs. CAESAR array of 170 CsI(Te) scintillators. Secondaries beam produced in 9Be(16O, X), E=150 MeV/nucleon reaction and delivered to the target via A1900 fragment separator (NSCL-MSU).

doi: 10.1103/PhysRevC.105.034314
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2022MO05      Nucl.Instrum.Methods Phys.Res. A1025, 166155 (2022)

C.Morse, H.L.Crawford, A.O.Macchiavelli, A.Wiens, M.Albers, A.D.Ayangeakaa, P.C.Bender, C.M.Campbell, M.P.Carpenter, P.Chowdhury, R.M.Clark, M.Cromaz, H.M.David, P.Fallon, R.V.F.Janssens, T.Lauritsen, I.-Y.Lee, C.J.Lister, D.Miller, V.S.Prasher, S.L.Tabor, D.Weisshaar, S.Zhu

The polarization sensitivity of GRETINA

NUCLEAR REACTIONS 24Mg(p, p'), E=2.45 MeV; measured reaction products, Eγ, Iγ. 25Mg; deduced γ-ray energies, J, π, polar angular distribution.

doi: 10.1016/j.nima.2021.166155
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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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2022SP04      Phys.Rev. C 106, 054305 (2022)

M.Spieker, L.A.Riley, P.D.Cottle, K.W.Kemper, D.Bazin, S.Biswas, P.J.Farris, A.Gade, T.Ginter, S.Giraud, J.Li, S.Noji, J.Pereira, M.Smith, D.Weisshaar, R.G.T.Zegers

Investigation of octupole collectivity near the A = 72 shape-transitional point

NUCLEAR REACTIONS 1H(76Kr, p), (74Kr, p), (72Se, p), E(cm)≈ 100 MeV/nucleon; measured Eγ, Iγ, γγ-coin, angular distribution; deduced levels, J, π, B(E2), B(E3). Comparison to theoretical calculations performed in the framework of the configuration-mixing sdf IBM mapping approach. Systematics of B(E3) transition strength in Kr, Se and Ge isotopes. Established two regions of distinct octupole strengths with a sudden strength increase around the A = 72 prolate-oblate-triaxial shape-transitional point. Ursinus liquid hydrogen target coupled to 8 GRETINA modules, containing four, 36-fold segmented HPGe detectors each. Beams produced from a 150-MeV/nucleon 78Kr primary beam in projectile fragmentation on 9Be target at Coupled Cyclotron Facility NSCL.

doi: 10.1103/PhysRevC.106.054305
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2022UT02      Phys.Rev. C 106, 024327 (2022)

S.Uthayakumaar, M.A.Bentley, E.C.Simpson, T.Haylett, R.Yajzey, S.M.Lenzi, W.Satula, D.Bazin, J.Belarge, P.C.Bender, P.J.Davies, B.Elman, A.Gade, H.Iwasaki, D.Kahl, N.Kobayashi, B.Longfellow, S.J.Lonsdale, E.Lunderberg, L.Morris, D.R.Napoli, T.G.Parry, X.Pereira-Lopez, F.Recchia, J.A.Tostevin, R.Wadsworth, D.Weisshaar

Spectroscopy of the T = 3 over 2 A = 47 and A = 45 mirror nuclei via one- and two-nucleon knockout reactions

NUCLEAR REACTIONS 9Be(48Mn, 47Mn), E=84 MeV/nucleon; 9Be(48V, 47Ti), E=89 MeV/nucleon; 9Be(47Cr, 45Cr), E=81 MeV/nucleon; 9Be(47V, 45Sc), E=85 MeV/nucleon, [48Mn, 48V, 47Cr, 47V secondary beams from 9Be(58Ni, X), E=160 MeV/nucleon, followed by separation of fragments using A1900 separator and S800 spectrograph at NSCL-MSU facility]; measured reaction products, outgoing particle identification plot, Eγ, Iγ, exclusive cross sections, (particle)γ-coin, γγ-coin for mirrored nuclei produced via one- and two-nucleon knockout reactions. 47Mn, 47Ti, 45Sc, 45Cr; deduced levels, J, π, mirror-energy differences (MED) for T=3/2 mirror nuclei. Comparison with reaction model, shell-model and DFT-NCII theoretical calculations. Discussed large asymmetry in the inclusive cross sections between the A=47 mirror pair in terms of binding-energy effects.

doi: 10.1103/PhysRevC.106.024327
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2021AS06      Phys.Rev. C 103, L051302 (2021)

J.Ash, H.Iwasaki, T.Mijatovic, T.Budner, R.Elder, B.Elman, M.Friedman, A.Gade, M.Grinder, J.Henderson, B.Longfellow, A.Revel, D.Rhodes, M.Spieker, Y.Utsuno, D.Weisshaar, C.Y.Wu

Cross-shell excitations in 46Ca studied with fusion reactions induced by a reaccelerated rare isotope beam

NUCLEAR REACTIONS 7Li(45K, 2nα)46Ca, E=4.66 MeV/nucleon, [secondary 45K beam from 9Be(48Ca, X) primary reaction, followed by separation of fragments using A1900 fragment separator at NSCL-MSU]; measured charged-particle recoils, Eγ, Iγ, (particle)γγ-coin using JANUS array of SeGA array of sixteen 32-fold segmented HPGe detectors, and an annular double-sided silicon detector. 46Ca; deduced levels, J, π, rotational-like band built on the excited 0+ state, configurations. Comparison with shell-model calculations in the sd-pf-sdg orbital space.

doi: 10.1103/PhysRevC.103.L051302
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2021EL06      Phys.Rev. C 104, 024307 (2021)

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

Lifetime measurements probing collectivity in the ground-state band of 32Mg

NUCLEAR REACTIONS 9Be(34Si, 32Mg), (34Si, 30Mg), E=60 MeV/nucleon, [secondary 34Si beam from 9Be(48Ca, X), E=140 meV/nucleon primary reaction, followed by separation of fragments using A1900 fragment separator at the NSCL-Coupled Cyclotron Facility]; measured reaction products by time-of-flight and energy-loss measurements using the S800 spectrograph, Eγ, Iγ, (32Mg)γ-coin, half-lives of the first 2+ and 4+ levels in 32Mg and first 2+ in 30Mg using GRETINA array for γ detection and TRIPLEX plunger device. 30,32Mg; deduced levels, J, π, B(E2). Comparison with shell-model calculations using SDPF-M, SDPF-U-MIX, AMPGCM, EKK, USDA and CHFB+LQRPA interactions, and with previous experimental B(E2) results. Systematics of measured B(E2) for first 2+ state in even-even Z=12 isotopes from N=16 to N=24, and those of theoretical B(E2) from N=16 to N=28.

doi: 10.1103/PhysRevC.104.024307
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2021GA02      Phys.Rev. C 103, 014314 (2021)

A.Gade, R.V.F.Janssens, D.Bazin, P.Farris, A.M.Hill, S.M.Lenzi, J.Li, D.Little, B.Longfellow, F.Nowacki, A.Poves, D.Rhodes, J.A.Tostevin, D.Weisshaar

In-beam γ-ray spectroscopy of 62, 64Cr

NUCLEAR REACTIONS 9Be(65Mn, 62Cr), (65Mn, 64Cr), (66Fe, 62Cr), (66Fe, 64Cr), (68Co, 62Cr), (68Co, 64Cr), E=90-95 MeV/nucleon, [secondary beams of 65Mn, 66Fe, 68Co from 9Be(82Se, X), E=140 MeV/nucleon primary reaction followed by separation of fragments using A1900 separator at NSCL-MSU Coupled Cyclotron Facility]; measured projectile-like reaction residues, Eγ, Iγ, (particle)γ-, and γγ-coin using GRETINA array for γ detection, and S800 ionization chamber with two plastic timing scintillators for detection of 62Cr and 64Cr particles analyzed through time-of-flight and energy loss. 62,64Cr; deduced levels, J, π. Comparison with shell-model calculations using LNPS interaction.

NUCLEAR STRUCTURE 62,64Cr; calculated levels, J, π, B(E2) using shell-model calculations with Lenzi-Nowacki-Poves-Sieja (LNPS) interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.103.014314
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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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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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2021KI09      Phys.Lett. B 822, 136682 (2021)

N.Kitamura, K.Wimmer, A.Poves, N.Shimizu, J.A.Tostevin, V.M.Bader, C.Bancroft, D.Barofsky, T.Baugher, D.Bazin, J.S.Berryman, V.Bildstein, A.Gade, N.Imai, T.Kroll, C.Langer, J.Lloyd, E.Lunderberg, F.Nowacki, G.Perdikakis, F.Recchia, T.Redpath, S.Saenz, D.Smalley, S.R.Stroberg, Y.Utsuno, D.Weisshaar, A.Westerberg

Coexisting normal and intruder configurations in 32Mg

NUCLEAR REACTIONS 9Be(33Mg, 32Mg), E=99.6 MeV/nucleon; 9Be(34Si, 32Mg), E=94.8 MeV/nucleon; measured reaction products, Eγ, Iγ. 32Mg; deduced γ-ray energies, J, π, level scheme, momentum distributions, one-neutron and two-proton knockout σ. Comparison with calculations, available data.

doi: 10.1016/j.physletb.2021.136682
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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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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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2021YA33      Phys.Lett. B 823, 136757 (2021)

R.Yajzey, M.A.Bentley, E.C.Simpson, T.Haylett, S.Uthayakumaar, D.Bazin, J.Belarge, P.C.Bender, P.J.Davies, B.Elman, A.Gade, H.Iwasaki, D.Kahl, N.Kobayashi, S.M.Lenzi, B.Longfellow, S.J.Lonsdale, E.Lunderberg, L.Morris, D.R.Napoli, X.Pereira-Lopez, F.Recchia, J.A.Tostevin, R.Wadsworth, D.Weisshaar

Spectroscopy of the T=2 mirror nuclei 48Fe/48Ti using mirrored knockout reactions

NUCLEAR REACTIONS 9Be(58Ni, X)48Fe/48Ti, E=160 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, σ for sta tes directly populated in this work through one-nucleon knockout, mirror energy differences (MED). Comparison with calculations. The Gamma-Ray Energy Tracking In-beam Nuclear Array GRETINA.

doi: 10.1016/j.physletb.2021.136757
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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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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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2020JO06      Phys.Rev. C 102, 024321 (2020)

S.Jongile, A.Lemasson, O.Sorlin, M.Wiedeking, P.Papka, D.Bazin, C.Borcea, R.Borcea, A.Gade, H.Iwasaki, E.Khan, A.Lepailleur, A.Mutschler, F.Nowacki, F.Recchia, T.Roger, F.Rotaru, M.Stanoiu, S.R.Stroberg, J.A.Tostevin, M.Vandebrouck, D.Weisshaar, K.Wimmer

Structure of 33Si and the magicity of the N=20 gap at Z=14

NUCLEAR REACTIONS 9Be(34Si, 33Si), E=98.5 MeV/nucleon, [34Si secondary beam from 9Be(48Ca, X), E=140 MeV/nucleon primary reaction, followed by separation of fragments using the A1900 fragment separator at the NSCL-MSU facility]; measured reaction residues using the S800 spectrograph, Eγ, Iγ, (33Si)γ-coin using the GRETINA array for γ detection, momentum distributions. 33Si; deduced levels, J, π, L-transfers in one-nucleon knockout reactions, population fractions, partial cross sections of final states, spectroscopic factors. Comparison with shell-model calculations with SDPF-U-MIX interaction, and with previous experimental results.

doi: 10.1103/PhysRevC.102.024321
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2020KI19      Phys.Rev. C 102, 054318 (2020)

N.Kitamura, K.Wimmer, N.Shimizu, V.M.Bader, C.Bancroft, D.Barofsky, T.Baugher, D.Bazin, J.S.Berryman, V.Bildstein, A.Gade, N.Imai, T.Kroll, C.Langer, J.Lloyd, E.Lunderberg, G.Perdikakis, F.Recchia, T.Redpath, S.Saenz, D.Smalley, S.R.Stroberg, J.A.Tostevin, N.Tsunoda, Y.Utsuno, D.Weisshaar, A.Westerberg

Structure of 30Mg explored via in-beam γ-ray spectroscopy

NUCLEAR REACTIONS 9Be(31Mg, 30Mg), E=97.9 MeV; 9Be(32Mg, 30Mg), E=99.1 MeV; 9Be(34Si, 30Mg), E=94.8 MeV; 9Be(35P, 30Mg), E=102.3 MeV, [secondary beams from 9Be(48Ca, X), E=140 MeV/nucleon, followed by separation of fragments using A1900 separator for beam purification at NSCL-MSU facility]; measured reaction products using S800 spectrometer, Eγ, Iγ, γγ-coin, Doppler-corrected add-back γ-ray spectra using the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) of seven modules, each module housing four HPGe crystals. 30Mg; deduced levels, J, π, population σ of levels, spectroscopic factors, parallel momentum distributions; calculated T-plots in (Q0, Q2) plane. Comparison with shell-model calculations using the SDPF-M and EEdf1 interactions for all states. Systematics of low-energy levels in 30Mg, 32Si, 34S, 36Ar, 38Ca. Relevance to "island of inversion".

doi: 10.1103/PhysRevC.102.054318
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2020LL01      Phys.Rev.Lett. 124, 152501 (2020)

R.D.O.Llewellyn, M.A.Bentley, R.Wadsworth, H.Iwasaki, J.Dobaczewski, G.de Angelis, J.Ash, D.Bazin, P.C.Bender, B.Cederwall, B.P.Crider, M.Doncel, R.Elder, B.Elman, A.Gade, M.Grinder, T.Haylett, D.G.Jenkins, I.Y.Lee, B.Longfellow, E.Lunderberg, T.Mijatovic, S.A.Milne, D.Muir, A.Pastore, D.Rhodes, D.Weisshaar

Establishing the Maximum Collectivity in Highly Deformed N=Z Nuclei

NUCLEAR REACTIONS 9Be(81Zr, n), (79Sr, n), (80Y, 2n), (80Y, 3np), E ∼ 77 MeV/nucleon; measured reaction products, Eγ, Iγ. 80Zr, 78Y, 76,78Sr; deduced level energies, J, π, level lifetimes, B(E2).

doi: 10.1103/PhysRevLett.124.152501
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2020LL02      Phys.Lett. B 811, 135873 (2020)

R.D.O.Llewellyn, M.A.Bentley, R.Wadsworth, J.Dobaczewski, W.Satula, H.Iwasaki, G.de Angelis, J.Ash, D.Bazin, P.C.Bender, B.Cederwall, B.P.Crider, M.Doncel, R.Elder, B.Elman, A.Gade, M.Grinder, T.Haylett, D.G.Jenkins, I.Y.Lee, B.Longfellow, E.Lunderberg, T.Mijatovic, S.A.Milne, D.Rhodes, D.Weisshaar

Spectroscopy of proton-rich 79Zr: Mirror energy differences in the highly-deformed fpg shell.

NUCLEAR REACTIONS 9Be(81Zr, 2n), (80Y, n), E<140 MeV/nucleon; measured reaction products, Eγ, Iγ. 79Zr, 79Y; deduced γ-ray energies and relative intensities, J, π, level schemes, mirror energy differences as a function of spin. Comparison with Hartree-Fock calculations.

doi: 10.1016/j.physletb.2020.135873
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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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2020MO32      Phys.Rev. C 102, 034325 (2020)

S.Momiyama, K.Wimmer, D.Bazin, J.Belarge, P.Bender, B.Elman, A.Gade, K.W.Kemper, N.Kitamura, B.Longfellow, E.Lunderberg, M.Niikura, S.Ota, P.Schrock, J.A.Tostevin, D.Weisshaar

Shell structure of 43S and collapse of the N=28 shell closure

NUCLEAR REACTIONS 9Be(44S, 43S), E=93.7 MeV/nucleon, [44S secondary beam from 9Be(48Ca, X), E=140 MeV/nucleon primary reaction, followed by separation and identification of 44S ions by A1900 separator and S800 spectrograph at the NSCL-MSU cyclotron facility]; measured reaction products, Eγ, Iγ, Doppler-corrected γ-ray spectrum using GRETINA array, delayed γ rays from the decay of isomeric states using IsoTagger consisting of 32 CsI(Na) detectors, (43S)γ- and γγ-coin, parallel momentum distributions. 43S; deduced levels, J, π, inclusive and exclusive cross sections for bound states, spectroscopic factors. Comparison with shell-model calculations using SDPF-U and SDPF-MU effective interactions. 44S; deduced intruder configuration in the ground state and N=28 shell quenching from the removal of a 2p3/2 neutron.

doi: 10.1103/PhysRevC.102.034325
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2020MO36      Phys.Rev. C 102, 054328 (2020)

C.Morse, A.O.Macchiavelli, H.L.Crawford, S.Zhu, C.Y.Wu, Y.Y.Wang, J.Meng, B.B.Back, B.Bucher, C.M.Campbell, M.P.Carpenter, J.Chen, R.M.Clark, M.Cromaz, P.Fallon, J.Henderson, R.V.F.Janssens, M.D.Jones, T.L.Khoo, F.G.Kondev, T.Lauritsen, I.Y.Lee, J.Li, D.Potterveld, C.Santamaria, G.Savard, D.Seweryniak, S.Stolze, D.Weisshaar

Quadrupole and octupole collectivity in 143Ba

NUCLEAR REACTIONS 208Pb(143Ba, 143Ba'), E=627.8 MeV, [143Ba beam from 252Cf SF at the CARIBU facility at ATLAS-ANL]; measured reaction products, Eγ, Iγ, scattered particles, (particle)γ-coin, and half-life of the first 9/2- level from (particle)γ-coin using GRETINA array of 11 Quad detector modules, each with four 36-fold segmented HPGe crystals for γ detection and CHICO2 array of 20 Parallel Plate Avalanche Counters (PPACs). 143Ba; deduced levels, J, π, Coulomb excitation γ-ray yields, E2 matrix elements using GOSIA least-squares analysis, B(E2), upper limit for E3 matrix element and B(E3), alignment plots, doubly decoupled structure. Comparison with Reflection-Asymmetric Triaxial Particle Rotor Model (RAT-PRM) calculations.

doi: 10.1103/PhysRevC.102.054328
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2019CH16      Phys.Rev. C 99, 044304 (2019)

R.J.Charity, K.W.Brown, J.Elson, W.Reviol, L.G.Sobotka, W.W.Buhro, Z.Chajecki, W.G.Lynch, J.Manfredi, R.Shane, R.H.Showalter, M.B.Tsang, D.Weisshaar, J.Winkelbauer, S.Bedoor, D.G.McNeel, A.H.Wuosmaa

Invariant-mass spectroscopy of 18Ne 16O, and 10C excited states formed in neutron-transfer reactions

NUCLEAR REACTIONS 9Be(17Ne, X), E=58.2 MeV/nucleon;9Be(15O, X), E=48.1 MeV/nucleon, [secondary 17Ne and 15O beams from 9Be(20Ne, X), E=170 MeV primary reaction]; 9Be(9C, X), E=64.6 MeV/nucleon, [secondary 9C beam from 9Be(16O, X), E=150 MeV primary reaction]; measured charged particle spectra, σ(θ), Eγ, Iγ, γ(θ), (particle)γ-coin, excitation-energy spectra with invariant-mass method, center-of-mass velocity distributions, invariant-mass spectroscopy for neutron transfer reactions using the HiRA ΔE-E telescope array for charged particle detection and the CAESAR array for γ detection at NSCL-MSU facility. 10C, 16O, 18Ne; deduced levels, J, π, widths, branching ratios of high-lying states, and IMM fits for A=18 Comparison with theoretical predictions, and with previous experimental results.

doi: 10.1103/PhysRevC.99.044304
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2019CH50      Phys.Rev. C 100, 064305 (2019)

R.J.Charity, K.W.Brown, J.Okolowicz, M.Ploszajczak, J.M.Elson, W.Reviol, L.G.Sobotka, W.W.Buhro, Z.Chajecki, W.G.Lynch, J.Manfredi, R.Shane, R.H.Showalter, M.B.Tsang, D.Weisshaar, J.R.Winkelbauer, S.Bedoor, A.H.Wuosmaa

Invariant-mass spectroscopy of 14O excited states

NUCLEAR REACTIONS 9Be(15O, 14O), E=52.1 MeV/nucleon, [secondary 15O beam from 9Be(20Ne, X)15O/17Ne, E=150 MeV/nucleon]; measured reaction products, Eγ, Iγ, (particle)γ-coin using HiRA array for particle detection and CAESAR array for γ rays at the NSCL-MSU facility. 14O; deduced levels, resonances, Jπ, Γ, cross sections and branching ratios for different one-proton and 2-proton emitting channels from excited states in 14O, configuration mixing in resonance spectra. 13N, 12C; deduced levels from 1-proton and 2-proton emissions from excited states in 14O. Comparison with shell model calculations embedded in the continuum (SMEC), treating bound and scattering states in a unified model.

doi: 10.1103/PhysRevC.100.064305
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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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2019GA01      Phys.Rev. C 99, 011301 (2019)

A.Gade, R.V.F.Janssens, J.A.Tostevin, D.Bazin, J.Belarge, P.C.Bender, S.Bottoni, M.P.Carpenter, B.Elman, S.J.Freeman, T.Lauritsen, S.M.Lenzi, B.Longfellow, E.Lunderberg, A.Poves, L.A.Riley, D.K.Sharp, D.Weisshaar, S.Zhu

Structure of 70Fe: Single-particle and collective degrees of freedom

NUCLEAR REACTIONS 9Be(71Co, 70Fe), E=87 MeV/nucleon, [secondary 71Co beam from 9Be(82Se, X), E=140 MeV/nucleon primary reaction, followed by separation of 71Co ions using A1900 fragment separator]; measured Eγ, Iγ, (70Fe ions)γ- and γγ-coin, residue energy loss and time of flight, σ for one-proton removal, level half-lives by line-shape analysis using GRETINA array for γ detection and the S800 spectrograph for particle identification at the NSCL-MSU facility. 70Fe; deduced levels, J, π, . Comparison with LNPS large-scale shell-model calculations.

doi: 10.1103/PhysRevC.99.011301
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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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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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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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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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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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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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2018CH25      Phys.Rev. C 97, 054318 (2018)

R.J.Charity, K.W.Brown, J.Okolowicz, M.Ploszajczak, J.M.Elson, W.Reviol, L.G.Sobotka, W.W.Buhro, Z.Chajecki, W.G.Lynch, J.Manfredi, R.Shane, R.H.Showalter, M.B.Tsang, D.Weisshaar, J.R.Winkelbauer, S.Bedoor, A.H.Wuosmaa

Spin alignment following inelastic scattering of 17Ne, lifetime of 16F, and its constraint on the continuum coupling strength

NUCLEAR REACTIONS 9Be(17Ne, 17Ne'), E=62.9 MeV/nucleon [17Ne secondary beam from 150 MeV/nucleon 16O primary beam]; measured reaction products, Ep and Ip(θ) of first and second protons in sequential two-proton decay of the second excited state of Jπ=5/2- in 17Ne using the High Resolution Array (HiRA) at NSCL-MSU. 17Ne; deduced excitation-energy spectra reconstructed from 2p+15O events from excited state of 17Ne, magnetic substate probability distribution, distribution of the relative emission angle between the sequential protons, and spin alignment of 17Ne excited state. 16F; deduced invariant mass spectra, widths of the first 0-, 1-, 2-, and 3- resonances, and compared with calculations using shell model embedded in the continuum (SMEC).

RADIOACTIVITY 16F(p)[from proton decay of excited state in 17Ne]; deduced width of the ground state from magnitude of the final-state interactions between the protons emitted by the excited state of 17Ne. Comparison with previous direct measurement of the width of the ground state.

doi: 10.1103/PhysRevC.97.054318
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2018HE14      Phys.Rev.Lett. 121, 082502 (2018)

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

Localizing the Shape Transition in Neutron-Deficient Selenium

NUCLEAR REACTIONS 208Pb(72Se, 72Se'), E=4 MeV/nucleon; measured reaction products, Eγ, Iγ. 72Se; deduced spectroscopic quadrupole moments, lack of low-spin shape change in neutron-deficient selenium.

doi: 10.1103/PhysRevLett.121.082502
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2018HU05      Phys.Rev. C 97, 054328 (2018)

M.Hughes, E.A.George, O.Naviliat-Cuncic, P.A.Voytas, S.Chandavar, A.Gade, X.Huyan, S.N.Liddick, K.Minamisono, S.V.Paulauskas, D.Weisshaar

Measurement of the 20F half-life

RADIOACTIVITY 20F(β-)[from 9Be(22Ne, X), E=150 MeV/nucleon followed by fragment analysis using A1900 fragment separator at NSCL-MSU]; measured γ radiation, β-γ-coin, half-life of 20F decay using four CsI(Na) detectors from the CAESAR array. Comparison with previous nine experimental values, and pointed out need for a new measurement using a method with different sources of systematic uncertainties, in order to resolve discrepancies in current data.

doi: 10.1103/PhysRevC.97.054328
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2018LO10      Phys.Rev. C 97, 054307 (2018)

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

Measurement of key resonances for the 24Al(p, γ) 25Si reaction rate using in-beam γ-ray spectroscopy

NUCLEAR REACTIONS 9Be(26Si, 25Si), E=118 MeV/nucleon; 9Be(25Al, 25Si), E=111 MeV/nucleon, [secondary 25Al and 26Si beams from 9Be(36Ar, X), E=150 MeV/nucleon primary reaction, and using A1900 fragment separator]; measured reaction products, yields, Eγ, Iγ, γγ- and (particle)γ-coin using S800 spectrograph for particles, and the CAESAR and SeGA arrays for γ detection at NSCL-MSU. 25Si; deduced levels, J, π, and γ-decay branching ratios, and compared with experimental levels for mirror nucleus 25Na, and with USDB+CD shell-model calculations. 24Al(p, γ)25Si, T=0.1-10 GK; calculated astrophysical reaction rates using the experimental states and states from charge-dependent USDA and USDB shell-model calculations. Comparison with other theoretical reaction rates.

doi: 10.1103/PhysRevC.97.054307
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2018LO20      Phys.Rev.Lett. 121, 262501 (2018)

C.Loelius, N.Kobayashi, H.Iwasaki, D.Bazin, J.Belarge, P.C.Bender, B.A.Brown, R.Elder, B.Elman, A.Gade, M.Grinder, S.Heil, A.Hufnagel, B.Longfellow, E.Lunderberg, M.Mathy, T.Otsuka, M.Petri, I.Syndikus, N.Tsunoda, D.Weisshaar, K.Whitmore

Enhanced Electric Dipole Strength for the Weakly Bound States in 27Ne

NUCLEAR REACTIONS 9Be(29Na, 27Ne), E=90.5 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, B(E1). Comparison with he shell-model calculations with the WBP-M and EEdf1 interactions.

doi: 10.1103/PhysRevLett.121.262501
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2018LU02      Nucl.Instrum.Methods Phys.Res. A885, 30 (2018)

E.Lunderberg, J.Belarge, P.C.Bender, B.Bucher, D.Cline, B.Elman, A.Gade, S.N.Liddick, B.Longfellow, C.Prokop, D.Weisshaar, C.Y.Wu

JANUS - A setup for low-energy Coulomb excitation at ReA3

NUCLEAR REACTIONS 208Pb(78Kr, 78Kr'), E=3.9 MeV/nucleon; measured reaction products, Eγ, Iγ. 78Kr; deduced yields, E2 nuclear matrix elements that can result in B(E2) values. GOSIA analysis.

doi: 10.1016/j.nima.2017.12.057
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2018MI07      Phys.Rev.Lett. 121, 012501 (2018)

T.Mijatovic, N.Kobayashi, H.Iwasaki, D.Bazin, J.Belarge, P.C.Bender, B.A.Brown, A.Dewald, R.Elder, B.Elman, A.Gade, M.Grinder, T.Haylett, S.Heil, C.Loelius, B.Longfellow, E.Lunderberg, M.Mathy, K.Whitmore, D.Weisshaar

Lifetime Measurements and Triple Coexisting Band Structure in 43S

NUCLEAR REACTIONS Be(44Cl, p)43S, E=99 MeV/nucleon; measured reaction products, Eγ, Iγ. 42S; deduced γ-ray energies, J, π, B(E2), B(M1), band structure. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.121.012501
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2018MO12      Phys.Lett. B 780, 227 (2018)

C.Morse, E.A.McCutchan, H.Iwasaki, C.J.Lister, V.M.Bader, D.Bazin, S.Beceiro Novo, P.Chowdhury, A.Gade, T.D.Johnson, C.Loelius, E.Lunderberg, E.Merchan, V.S.Prasher, F.Recchia, A.A.Sonzogni, D.Weisshaar, K.Whitmore

Enhanced collectivity in 12Be

NUCLEAR REACTIONS Ta, Nb(12Be, 12Be'), E ∼ 55 MeV/nucleon; measured reaction products, Eγ, Iγ. 12Be; deduced level lifetime, B(E2) values. Comparison with available data.

doi: 10.1016/j.physletb.2018.03.004
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2018MO30      Phys.Lett. B 787, 198 (2018)

C.Morse, H.Iwasaki, A.Lemasson, A.Dewald, T.Braunroth, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, C.M.Campbell, A.Gade, C.Langer, I.Y.Lee, C.Loelius, E.Lunderberg, F.Recchia, D.Smalley, S.R.Stroberg, R.Wadsworth, C.Walz, D.Weisshaar, A.Westerberg, K.Whitmore, K.Wimmer

Lifetime measurement of the 2+1 state in 74Rb and isospin properties of quadrupole transition strengths at N=Z

NUCLEAR REACTIONS 9Be(74Kr, 74Rb), E=93 MeV/nucleon; measured reaction products, Eγ, Iγ. 74Rb; deduced γ-ray energies, J, π, level lifetimes, B(E2). Recoil Distance Doppler Shift (RDDS) technique.

doi: 10.1016/j.physletb.2018.10.064
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2017BO23      Phys.Lett. B 775, 271 (2017)

S.Bottoni, S.Zhu, R.V.F.Janssens, M.P.Carpenter, Y.Tsunoda, T.Otsuka, A.O.Macchiavelli, D.Cline, C.Y.Wu, A.D.Ayangeakaa, B.Bucher, M.Q.Buckner, C.M.Campbell, C.J.Chiara, H.L.Crawford, M.Cromaz, H.M.David, P.Fallon, A.Gade, J.P.Greene, J.Harker, A.B.Hayes, C.R.Hoffman, B.P.Kay, A.Korichi, T.Lauritsen, J.Sethi, D.Seweryniak, W.B.Walters, D.Weisshaar, A.Wiens

Nucleon correlations and the structure of 7130Zn41

NUCLEAR REACTIONS 70Zn(48Ca, 47Ca)71Zn, E=170 MeV; 197Au(70Zn, X)71Zn, E=430 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, decay scheme, J, π, modest oblate deformation. Comparison with Monte-Carlo shell-model calculations.

doi: 10.1016/j.physletb.2017.11.003
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2017BR07      Phys.Rev. C 95, 044326 (2017)

K.W.Brown, R.J.Charity, J.M.Elson, W.Reviol, L.G.Sobotka, W.W.Buhro, Z.Chajecki, W.G.Lynch, J.Manfredi, R.Shane, R.H.Showalter, M.B.Tsang, D.Weisshaar, J.R.Winkelbauer, S.Bedoor, A.H.Wuosmaa

Proton-decaying states in light nuclei and the first observation of 17Na

NUCLEAR REACTIONS 9Be(17Ne, 17Na), (17Ne, 17Ne), (17Ne, 16F), E=58 MeV/nucleon, [secondary 17Ne beam from 9Be(20Ne, X), E=170 MeV/nucleon primary reaction at NSCL-MSU accelerator facility]; 9Be(9C, 9C), (9C, 9B), (9C, 8B), E=68 MeV/nucleon, [secondary 9C beam from 9Be(16O, X), E=150 MeV/nucleon primary reaction]; measured charged-particle reaction products using HiRA array of 14 ΔE-E telescopes, and γ rays by CAESAR array of 158 CsI(Na), (particle)γ-coin; analyzed invariant mass spectra, R-matrix fits. 17Na, 17Ne, 16F, 9C, 8,9B; deduced levels, upper limit of mass for 17Na, proton unbound levels, widths, J, π, three-proton decay of 17Na, one- and two-proton decay branches of other nuclei. First identification of unbound 17Na nucleus.

doi: 10.1103/PhysRevC.95.044326
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2017CR03      Phys.Rev. C 95, 064317 (2017)

H.L.Crawford, A.O.Macchiavelli, P.Fallon, M.Albers, V.M.Bader, D.Bazin, C.M.Campbell, R.M.Clark, M.Cromaz, J.Dilling, A.Gade, A.Gallant, J.D.Holt, R.V.F.Janssens, R.Krucken, C.Langer, T.Lauritsen, I.Y.Lee, J.Menendez, S.Noji, S.Paschalis, F.Recchia, J.Rissanen, A.Schwenk, M.Scott, J.Simonis, S.R.Stroberg, J.A.Tostevin, C.Walz, D.Weisshaar, A.Wiens, K.Wimmer, S.Zhu

Unexpected distribution of ν1f7/2 strength in 49Ca

NUCLEAR REACTIONS 9Be(48Ca, 47Ca), (50Ca, 49Ca), E not given, [secondary 48,50Ca beams from 9Be(82Se, X), E=140 MeV/nucleon primary reaction, and using A1900 fragment separator at NSCL-MSU]; measured reaction 1n-knockout products using S800 magnetic spectrograph, Eγ, Iγ, γγ-coin, γ(particle) correlated events, using GRETINA array for γ detection, σ(-1n), parallel momentum distributions. 47,49Ca; deduced levels, J, π, l-transfer, γ-ray yields by fitting the data with GEANT4 simulation, spectroscopic factors, configurations, spectroscopic strengths for the 1f7/2 neutron hole states. Comparison with shell-model calculations based on NN+3N force in ν(pf) model space, GXPF1 interaction, and NN+3N including the ν1g9/2 orbital.

doi: 10.1103/PhysRevC.95.064317
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2017EL04      Phys.Rev. C 96, 044332 (2017)

B.Elman, A.Gade, D.Weisshaar, D.Barofsky, D.Bazin, P.C.Bender, M.Bowry, M.Hjorth-Jensen, K.W.Kemper, S.Lipschutz, E.Lunderberg, N.Sachmpazidi, N.Terpstra, W.B.Walters, A.Westerberg, S.J.Williams, K.Wimmer

Quadrupole collectivity beyond N = 50 in neutron-rich Se and Kr isotopes

NUCLEAR REACTIONS 209Bi(88Kr, 88Kr'), E=67 MeV/nucleon; 209Bi(90Kr, 90Kr'), E=68 MeV/nucleon; 209Bi(86Se, 86Se'), E=79 MeV/nucleon, [secondary 88,90Kr, 86Se beams from 9Be(96Zr, X), E=120 MeV/nucleon using A1900 fragment separator at the NSCL-MSU Cyclotron Laboratory]; measured reaction products and particle identification plot, Doppler-corrected Eγ, Iγ, (particle)γ-coin, σ, using the CAESAR array of 192 CsI(Na) scintillators. 88,90Kr, 86Se; deduced levels, J, π, Coulomb excitation yields, B(E2) for excited 2+ states. Comparison with shell-model calculations. 88,90Kr, 86Se; calculated shell-model occupations of the proton and neutron orbitals for the observed levels. Systematics of B(E2) values for the first 2+ states in N=36-60 Kr and Se nuclei.

doi: 10.1103/PhysRevC.96.044332
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2017KA25      Phys.Lett. B 769, 549 (2017)

A.Kankainen, P.J.Woods, H.Schatz, T.Poxon-Pearson, D.T.Doherty, V.Bader, T.Baugher, D.Bazin, B.A.Brown, J.Browne, A.Estrade, A.Gade, J.Jose, A.Kontos, C.Langer, G.Lotay, Z.Meisel, F.Montes, S.Noji, F.Nunes, G.Perdikakis, J.Pereira, F.Recchia, T.Redpath, R.Stroberg, M.Scott, D.Seweryniak, J.Stevens, D.Weisshaar, K.Wimmer, R.Zegers

Measurement of key resonance states for the 30P(p, γ)31S reaction rate, and the production of intermediate-mass elements in nova explosions

NUCLEAR REACTIONS 2H(30P, n)31S, E=30 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies and relative intensities, σ, negative-parity states, spectroscopic factors, resonance parameters, astrophysical reaction rates. The GRETINA (Gamma-Ray Energy Tracking In-beam Nuclear Array), the National Superconducting Cyclotron Laboratory, Michigan State University.

doi: 10.1016/j.physletb.2017.01.084
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2017MU05      Nat.Phys. 13, 152 (2017)

A.Mutschler, A.Lemasson, O.Sorlin, D.Bazin, C.Borcea, R.Borcea, Z.Dombradi, J.-P.Ebran, A.Gade, H.Iwasaki, E.Khan, A.Lepailleur, F.Recchia, T.Roger, F.Rotaru, D.Sohler, M.Stanoiu, S.R.Stroberg, J.A.Tostevin, M.Vandebrouck, D.Weisshaar, K.Wimmer

A proton density bubble in the doubly magic 34Si nucleus

NUCLEAR REACTIONS 9Be(34Si, p)33Al, E<140 MeV/nucleon; measured reaction products, Eγ, Iγ. 34Si; deduced γ-ray energies, parallel momentum distributions of the strongest populated states, neutron and proton density distributions. Comparison with available data.

doi: 10.1038/nphys3916
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2017ON01      Phys.Rev. C 95, 055806 (2017)

W.-J.Ong, C.Langer, F.Montes, A.Aprahamian, D.W.Bardayan, D.Bazin, B.A.Brown, J.Browne, H.Crawford, R.Cyburt, E.B.Deleeuw, C.Domingo-Pardo, A.Gade, S.George, P.Hosmer, L.Keek, A.Kontos, I.-Y.Lee, A.Lemasson, E.Lunderberg, Y.Maeda, M.Matos, Z.Meisel, S.Noji, F.M.Nunes, A.Nystrom, G.Perdikakis, J.Pereira, S.J.Quinn, F.Recchia, H.Schatz, M.Scott, K.Siegl, A.Simon, M.Smith, A.Spyrou, J.Stevens, S.R.Stroberg, D.Weisshaar, J.Wheeler, K.Wimmer, R.G.T.Zegers

Low-lying level structure of 56Cu and its implications for the rp process

NUCLEAR REACTIONS 2H(56Ni, 56Cu), E AP 75 MeV/nucleon, [secondary 56Ni beam from 9Be(58Ni, X), E=160 MeV/nucleon primary reaction using A1900 separator at NSCL-MSU facility]; measured ΔE-TOF particle identification for ions, Eγ, Iγ, γγ-, (56Cu ions)γ-coin using GRETINA array and S800 magnetic spectrograph. 56Cu; deduced levels, J, π. Comparison with mirror nucleus 56Co level scheme, and with shell-model calculations 55Ni(p, γ)56Cu, T9=0.1-10; deduced Q value, astrophysical reaction rates as function of temperature, and impact on the r-process around 56Ni.

NUCLEAR STRUCTURE 56Cu; calculated levels, resonance energies, J, π, spectroscopic factors, Γp, Γγ using shell model with the GXPF1A interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.055806
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2017PA02      Phys.Rev.Lett. 118, 052501 (2017)

J.J.Parker, IV, I.Wiedenhover, P.D.Cottle, J.Baker, D.McPherson, M.A.Riley, D.Santiago-Gonzalez, A.Volya, V.M.Bader, T.Baugher, D.Bazin, A.Gade, T.Ginter, H.Iwasaki, C.Loelius, C.Morse, F.Recchia, D.Smalley, S.R.Stroberg, K.Whitmore, D.Weisshaar, A.Lemasson, H.L.Crawford, A.O.Macchiavelli, K.Wimmer

Isomeric Character of the Lowest Observed 4+ State in 44S

NUCLEAR REACTIONS Be(46Ar, 2p)44S, E=99 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, level T1/2, B(E2). Plunger apparatus at GRETINA.

doi: 10.1103/PhysRevLett.118.052501
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2017RI06      Phys.Rev. C 96, 011303 (2017)

A.L.Richard, H.L.Crawford, P.Fallon, A.O.Macchiavelli, V.M.Bader, D.Bazin, M.Bowry, C.M.Campbell, M.P.Carpenter, R.M.Clark, M.Cromaz, A.Gade, E.Ideguchi, H.Iwasaki, M.D.Jones, C.Langer, I.Y.Lee, C.Loelius, E.Lunderberg, C.Morse, J.Rissanen, M.Salathe, D.Smalley, S.R.Stroberg, D.Weisshaar, K.Whitmore, A.Wiens, S.J.Williams, K.Wimmer, T.Yamamato

Strongly coupled rotational band in 33Mg

NUCLEAR REACTIONS 9Be(46Ar, 33Mg), E=102 MeV/nucleon, [secondary 46Ar beam from 9Be(48Ca, X), E=140 MeV/nucleon primary reaction at NSCL-MSU facility]; measured reaction products, Eγ, Iγ, (33Mg)γ-, γγ-coin using S800 spectrograph for particle identification and GRETINA array for γ detection. 33Mg; deduced low-energy yrast levels, J, π, rotational band, ground-state magnetic moment, and intrinsic quadrupole moment. Comparison with strong-coupling limit of a rotational model.

doi: 10.1103/PhysRevC.96.011303
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2017RI09      Phys.Rev. C 96, 064315 (2017)

L.A.Riley, M.L.Agiorgousis, T.R.Baugher, D.Bazin, R.L.Blanchard, M.Bowry, P.D.Cottle, F.G.DeVone, A.Gade, M.T.Glowacki, K.W.Kemper, J.S.Kustina, E.Lunderberg, D.M.McPherson, S.Noji, J.Piekarewicz, F.Recchia, B.V.Sadler, M.Scott, D.Weisshaar, R.G.T.Zegers

Spectroscopy of 54Ti and the systematic behavior of low-energy octupole states in Ca and Ti isotopes

NUCLEAR REACTIONS 1H(54Ti, p'), (55Ti, 54Ti), E=91.5 MeV/nucleon, [secondary 54,55Ti beams from 9Be(76Ge, X), E=130 MeV/nucleon primary reaction using A1900 separator at NSCL-MSU]; measured Eγ, Iγ, γγ-coin, σ using GRETINA array for γ detection. 54Ti; deduced levels, J, π, γ-ray branching ratios, deformation lengths. Comparison with previous experimental results, and with random phase approximation (RPA) calculations using NL3, FSUGold and FSUGarnet effective interactions. Discussed systematics of E3 strength distributions in neighboring nuclei.

NUCLEAR STRUCTURE 40,42,44,46,48,50,52Ca, 50,52,54Ti; calculated E3 strength distributions using random phase approximation (RPA) with NL3, FSUGold and FSUGarnet effective interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.96.064315
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2017SC07      Phys.Rev.Lett. 118, 172501 (2017)

M.Scott, R.G.Zegers, R.Almus, S.M.Austin, D.Bazin, B.A.Brown, C.Campbell, A.Gade, M.Bowry, S.Galies, U.Garg, M.N.Harakeh, E.Kwan, C.Langer, C.Loelius, S.Lipschutz, E.Litvinova, E.Lunderberg, C.Morse, S.Noji, G.Perdikakis, T.Redpath, C.Robin, H.Sakai, Y.Sasamoto, M.Sasano, C.Sullivan, J.A.ostevin, T.Uesaka, D.Weisshaar

Observation of the Isovector Giant Monopole Resonance via the 28Si(10Be, 10B*[1.74 MeV]) Reaction at 100 A MeV

NUCLEAR REACTIONS 28Si(10Be, 10B'), E=100 MeV/nucleon; measured reaction products, Eγ, Iγ. 28Al, 10B; deduced σ(θ, E), σ(θ), isobaric analog state in 10B, excitation-energy spectrum in 28Al, monopole and dipole contributions and the isovector giant dipole resonance and isovector giant monopole resonance (IVGMR). Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.118.172501
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2016BA04      Phys.Rev. C 93, 014313 (2016)

T.Baugher, A.Gade, R.V.F.Janssens, S.M.Lenzi, D.Bazin, M.P.Carpenter, C.J.Chiara, A.N.Deacon, S.J.Freeman, G.F.Grinyer, C.R.Hoffman, B.P.Kay, F.G.Kondev, T.Lauritsen, E.M.Lunderberg, S.McDaniel, K.C.Meierbachtol, A.Ratkiewicz, S.R.Stroberg, K.A.Walsh, D.Weisshaar, S.Zhu

In-beam γ spectroscopy of 63Mn

NUCLEAR REACTIONS 9Be(63Mn, 63Mn'), E=84 meV/nucleon, [secondary 63Mn from 9Be(76Ge, X), E=130 MeV/nucleon primary reaction]; measured Eγ, Iγ, (63Mn)γ-, γγ-coin, level half-lives by Doppler line-shape analysis using SeGA and GRETINA arrays for γ detection, A1900 fragment separator and S-800 spectrograph at NSCL-MSU accelerator facility; recreated Doppler-corrected γ spectra. 63Mn; deduced levels, J, π, B(M1), B(E2). Comparison with large-scale shell-model calculations using different model spaces and effective interactions. Systematics of 59,61,63Mn level structures.

doi: 10.1103/PhysRevC.93.014313
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2016CE01      Phys.Rev. C 93, 021601 (2016)

G.Cerizza, A.Ayres, K.L.Jones, R.Grzywacz, A.Bey, C.Bingham, L.Cartegni, D.Miller, S.Padgett, T.Baugher, D.Bazin, J.S.Berryman, A.Gade, S.McDaniel, A.Ratkiewicz, A.Shore, S.R.Stroberg, D.Weisshaar, K.Wimmer, R.Winkler, S.D.Pain, K.Y.Chae, J.A.Cizewski, M.E.Howard, J.A.Tostevin

Structure of 107Sn studied through single-neutron knockout reactions

NUCLEAR REACTIONS 9Be(108Sn, 107Sn), (106Sn, 105Sn), E=80 MeV/nucleon, [secondary 106,108Sn beams from 9Be(124Xe, X), E=140 MeV/nucleon primary reaction using A1900 separator at NSCL-MSU]; measured yields of reaction products, Eγ, Iγ, (107Sn)γ-coin, momentum distributions, cross sections using CAESAR array of 192 CsI(Na) crystals for γ rays and particle identification by TOF, ΔE-E measured in the S800 focal-plane ion chamber. 107Sn; deduced levels, J, π. Comparison of experimental momentum distribution with eikonal model reaction calculations for neutron removal. Shell-model calculations of cross sections and spectroscopic factors. 105Sn; see 2015Jo03 (reference 20 in present paper) for experimental results.

doi: 10.1103/PhysRevC.93.021601
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2016CR01      Phys.Rev. C 93, 031303 (2016)

H.L.Crawford, P.Fallon, A.O.Macchiavelli, A.Poves, V.M.Bader, D.Bazin, M.Bowry, C.M.Campbell, M.P.Carpenter, R.M.Clark, M.Cromaz, A.Gade, E.Ideguchi, H.Iwasaki, C.Langer, I.Y.Lee, C.Loelius, E.Lunderberg, C.Morse, A.L.Richard, J.Rissanen, D.Smalley, S.R.Stroberg, D.Weisshaar, K.Whitmore, A.Wiens, S.J.Williams, K.Wimmer, T.Yamamato

Rotational band structure in 32Mg

NUCLEAR REACTIONS 9Be(46Ar, 32Mg), E=102 MeV/nucleon, [secondary 46Ar beam from 9Be(48Ca, X), E=140 MeV/nucleon primary reaction]; measured Eγ, Iγ, (32Mg)γ-, γγ-coin using A1900 fragment separator, S800 spectrograph and GRETINA array at NSCL-MSU. 32Mg; deduced levels, J, π, rotational band in a nuclide in "island of inversion", configuration. Comparison with large-scale shell model calculations using ANTOINE code with the SDPF-U-MIX effective two-body interaction.

doi: 10.1103/PhysRevC.93.031303
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2016GA07      Phys.Rev. C 93, 031601 (2016)

A.Gade, J.A.Tostevin, V.Bader, T.Baugher, D.Bazin, J.S.Berryman, B.A.Brown, D.J.Hartley, E.Lunderberg, F.Recchia, S.R.Stroberg, Y.Utsuno, D.Weisshaar, K.Wimmer

One-neutron pickup into 49Ca: Bound neutron g9/2 spectroscopic strength at N=29

NUCLEAR REACTIONS 12C(48Ca, 49Ca), E=140 MeV/nucleon; measured Eγ, Iγ, (49Ca)γ-coin, γ(θ), neutron-pickup single-particle cross sections using A1900 fragment separator and GRETINA array at NSCL-MSU. Heavy-ion-induced neutron-pickup reaction. DWBA analysis. 49Ca; deduced levels, J, π, multipolarity, spectroscopic factors. Comparison with full sd+pf+sdg valence-space shell-model calculations.

doi: 10.1103/PhysRevC.93.031601
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2016GA14      Phys.Rev. C 93, 054315 (2016)

A.Gade, J.A.Tostevin, V.Bader, T.Baugher, D.Bazin, J.S.Berryman, B.A.Brown, C.Aa.Diget, T.Glasmacher, D.J.Hartley, E.Lunderberg, S.R.Stroberg, F.Recchia, A.Ratkiewicz, D.Weisshaar, K.Wimmer

Single-particle structure at N=29: The structure of 47Ar and first spectroscopy of 45S

NUCLEAR REACTIONS 9Be(48K, 47Ar), E=87.5 MeV/nucleon; 12C(46Ar, 47Ar), E=67 MeV/nucleon; 9Be(46Cl, 45S), [secondary 48K, 46Ar and 46Cl beams from 9Be(48Ca, X), E=140 MeV/nucleon primary reaction using A1900 fragment separator at NSCL-MSU]; measured particle identification spectra, Eγ, Iγ, γγ-coin using S800 spectrograph and SeGA array of 32-fold segmented HPGe detectors. 45S, 47Ar; deduced levels, J, π, σ. Detailed calculations for cross sections and spectroscopic factors using Eikonal dynamics for proton-removal, DWBA for neutron pickup, and SDPF-U and SDPF-MU shell-model interactions.

doi: 10.1103/PhysRevC.93.054315
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2016HU07      Hyperfine Interactions 237, 93 (2016)

X.Huyan, O.Naviliat-Cuncic, D.Bazin, A.Gade, M.Hughes, S.Liddick, K.Minamisono, S.Noji, S.V.Paulauskas, A.Simon, P.Voytas, D.Weisshaar

Toward a measurement of weak magnetism in 6He decay

RADIOACTIVITY 6He(β-); measured decay products, Eβ, Iβ; deduced β-spectrum, precision for contribution due to the weak magnetism form factor.

doi: 10.1007/s10751-016-1303-8
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2016KA05      Eur.Phys.J. A 52, 6 (2016)

A.Kankainen, P.J.Woods, F.Nunes, C.Langer, H.Schatz, V.Bader, T.Baugher, D.Bazin, B.A.Brown, J.Browne, D.T.Doherty, A.Estrade, A.Gade, A.Kontos, G.Lotay, Z.Meisel, F.Montes, S.Noji, G.Perdikakis, J.Pereira, F.Recchia, T.Redpath, R.Stroberg, M.Scott, D.Seweryniak, J.Stevens, D.Weisshaar, K.Wimmer, R.Zegers

Angle-integrated measurements of the 26Al (d, n) 27Si reaction cross section: a probe of spectroscopic factors and astrophysical resonance strengths

NUCLEAR REACTIONS 2H(26Al, n), E=30 MeV/nucleon; measured 511 keV γ-ray using GRETINA (Gamma-Ray Energy Tracking In-beam Nuclear Array), Si recoils, (Si)γ-coin; deduced Doppler-reconstructed γ-ray spectrum in coincidence with Si, σ, resonances, spectroscopic factors to discrete states; calculated σ using shell model.

doi: 10.1140/epja/i2016-16006-5
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2016KO15      Phys.Rev.Lett. 116, 122502 (2016)

K.Kolos, D.Miller, R.Grzywacz, H.Iwasaki, M.Al-Shudifat, D.Bazin, C.R.Bingham, T.Braunroth, G.Cerizza, A.Gade, A.Lemasson, S.N.Liddick, M.Madurga, C.Morse, M.Portillo, M.M.Rajabali, F.Recchia, L.L.Riedinger, P.Voss, W.B.Walters, D.Weisshaar, K.Whitmore, K.Wimmer, J.A.Tostevin

Direct Lifetime Measurements of the Excited States in 72Ni

NUCLEAR REACTIONS 9Be(73Cu, p)72Ni, E=102MeV/nucleon; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, lifetimes, B(E2) values. Comparison with nuclear shell model calculations.

doi: 10.1103/PhysRevLett.116.122502
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2016LO10      Phys.Rev. C 94, 024340 (2016)

C.Loelius, H.Iwasaki, B.A.Brown, M.Honma, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, T.Braunroth, C.M.Campbell, A.Dewald, A.Gade, N.Kobayashi, C.Langer, I.Y.Lee, A.Lemasson, E.Lunderberg, C.Morse, F.Recchia, D.Smalley, S.R.Stroberg, R.Wadsworth, C.Walz, D.Weisshaar, A.Westerberg, K.Whitmore, K.Wimmer

Lifetime measurement of the 4+1 state of 58Ni with the recoil distance method

NUCLEAR REACTIONS 9Be(74Kr, 58Ni), E=93 MeV/nucleon, [secondary 74Kr beam from 9Be(78Kr, X), E=150 MeV/nucleon]; measured reaction products, Eγ, Iγ, (58Ni ions)γ-coin, half-life of the first 4+ state in 58Ni by recoil distance Doppler shift method using Triple Plunger for Exotic Beams (TRIPLEX) coupled with GRETINA array and the S800 spectrograph at NSCL-MSU facility. 58Ni; deduced level, B(E2) for the first 4+ state. Comparison with GXPF1A shell-model calculations, and with previous measurements.

doi: 10.1103/PhysRevC.94.024340
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2016LU14      Phys.Rev. C 94, 064327 (2016)

E.Lunderberg, A.Gade, V.Bader, T.Baugher, D.Bazin, J.S.Berryman, B.A.Brown, D.J.Hartley, F.Recchia, S.R.Stroberg, D.Weisshaar, K.Wimmer

In-beam γ-ray spectroscopy of 38-42S

NUCLEAR REACTIONS 12C(46Ar, X)40S/41S/42S/43S, E=67.0 MeV/nucleon; 12C(48Ca, X)38S/39S/40S, E=66.7 MeV/nucleon, [secondary 46Ar beam from 9Be(48Ca, X) primary reaction]; measured particle identification spectra, yields using A1900 fragment separator and S800 spectrograph, Eγ, Iγ, γγ-coin, (particle)γ-coin using GRETINA array at NSCL-MSU facility. 38,39,40,41,42,43S; deduced levels, J, π, estimated half-life of 6+ state in 38S; calculated shell model (SDPF-MU) neutron p3/2 occupancies for the 0+ and 2+ states in 38,40,42,44S. Comparison with large-scale shell-model calculations with the SDPF-MU effective interaction for the sd-pf shell using NUSHELLX code.

doi: 10.1103/PhysRevC.94.064327
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2016MI05      Phys.Rev. C 93, 024318 (2016)

S.A.Milne, M.A.Bentley, E.C.Simpson, P.Dodsworth, T.Baugher, D.Bazin, J.S.Berryman, A.M.Bruce, P.J.Davies, C.Aa.Diget, A.Gade, T.W.Henry, H.Iwasaki, A.Lemasson, S.M.Lenzi, S.McDaniel, D.R.Napoli, A.J.Nichols, A.Ratkiewicz, L.Scruton, S.R.Stroberg, J.A.Tostevin, D.Weisshaar, K.Wimmer, R.Winkler

Mirrored one-nucleon knockout reactions to the TZ = ±3/2 A=53 mirror nuclei

NUCLEAR REACTIONS 9Be(54Ni, 53Ni), (54Fe, 53Mn), E=87 MeV/nucleon, [secondary 54Ni and 54Fe beams from 9Be(58Ni, X), E=160 MeV/nucleon primary reaction]; measured Eγ, Iγ, (particle)γ-coin, level half-lives by Doppler line-shape analysis, relative cross sections for one-neutron and one-proton knockout reactions using A1900 fragment separator, S800 spectrograph and SeGA array at NSCL-MSU. 53Ni, 53Mn; deduced levels, J, π, B(M1), B(E2), mirror-energy differences (MED) between isobaric analog states. Comparison with shell-model calculations by including a set of isovector isospin-nonconserving matrix elements.

doi: 10.1103/PhysRevC.93.024318
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2016MI17      Phys.Rev.Lett. 117, 082502 (2016)

S.A.Milne, M.A.Bentley, E.C.Simpson, T.Baugher, D.Bazin, J.S.Berryman, A.M.Bruce, P.J.Davies, C.Aa.Diget, A.Gade, T.W.Henry, H.Iwasaki, A.Lemasson, S.M.Lenzi, S.McDaniel, D.R.Napoli, A.J.Nichols, A.Ratkiewicz, L.Scruton, S.R.Stroberg, J.A.Tostevin, D.Weisshaar, K.Wimmer, R.Winkler

Isospin Symmetry at High Spin Studied via Nucleon Knockout from Isomeric States

NUCLEAR REACTIONS 9Be(53Co, n)52Co, E=77 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, relative σ, high-spin isomeric states.

doi: 10.1103/PhysRevLett.117.082502
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2016MU03      Phys.Rev. C 93, 034333 (2016)

A.Mutschler, O.Sorlin, A.Lemasson, D.Bazin, C.Borcea, R.Borcea, A.Gade, H.Iwasaki, E.Khan, A.Lepailleur, F.Recchia, T.Roger, F.Rotaru, M.Stanoiu, S.R.Stroberg, J.A.Tostevin, M.Vandebrouck, D.Weisshaar, K.Wimmer

Spectroscopy of 35P using the one-proton knockout reaction

NUCLEAR REACTIONS 9Be(36S, 35P), (36S, 36P), E=88 MeV/nucleon, [secondary 36S beam from 9Be(48Ca, X), E=140 MeV/nucleon primary reaction]; measured Eγ, Iγ, γγ-coin, parallel momentum distributions using A1900 fragment separator, S800 spectrograph and GRETINA array at NSCL-MSU. 35P; deduced levels, J, π, L-transfers, spectroscopic factors. 36P; measured Eγ, parallel momentum distribution; deduced level population. 36S; deduced proton occupancies.

doi: 10.1103/PhysRevC.93.034333
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2016RE20      Phys.Rev. C 94, 054324 (2016)

F.Recchia, D.Weisshaar, A.Gade, J.A.Tostevin, R.V.F.Janssens, M.Albers, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, B.A.Brown, C.M.Campbell, M.P.Carpenter, J.Chen, C.J.Chiara, H.L.Crawford, C.R.Hoffman, F.G.Kondev, A.Korichi, C.Langer, T.Lauritsen, S.N.Liddick, E.Lunderberg, S.Noji, C.Prokop, S.R.Stroberg, S.Suchyta, K.Wimmer, S.Zhu

Neutron single-particle strengths at N=40, 42: Neutron knockout from 68, 70Ni ground and isomeric states

NUCLEAR REACTIONS 9Be(68Ni, 67Ni), E=85 MeV/nucleon; 9Be(70Ni, 69Ni), E=74 MeV/nucleon, [secondary 68,70Ni beams from 9Be(82Se, X), E=140 MeV/nucleon, followed by separation of fragments using A1900 separator at NSCL-MSU]; measured particle spectra, Eγ, Iγ, one-neutron knockout σ for levels in the final nuclei, (67Ni or 69Ni)γ-coin, parallel momentum distributions, delayed γ from isomers using GRETINA array for γ detection and S800 spectrograph for particle analysis. 67,69Ni; measured levels, J, π, l-transfers. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.94.054324
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2016RI02      Phys.Rev. C 93, 044327 (2016)

L.A.Riley, D.M.McPherson, M.L.Agiorgousis, T.R.Baugher, D.Bazin, M.Bowry, P.D.Cottle, F.G.DeVone, A.Gade, M.T.Glowacki, S.D.Gregory, E.B.Haldeman, K.W.Kemper, E.Lunderberg, S.Noji, F.Recchia, B.V.Sadler, M.Scott, D.Weisshaar, R.G.T.Zegers

Octupole strength in the neutron-rich calcium isotopes

NUCLEAR REACTIONS 1H(49Ca, 49Ca'), E=94 MeV/nucleon; 1H(51Ca, 51Ca'), E=86 MeV/nucleon; 1H(52Ca, 52Ca'), E=84 MeV/nucleon, [secondary 49,51,52Ca cocktail beam from 9Be(76Ge, X), E=130 MeV/nucleon primary reaction, using A1900 fragment separator at NSCL-MSU]; measured Eγ, Iγ, (particle)γ-coin using high resolution S800 magnetic spectrograph and high resolution gamma-ray tracking (GRETINA) array. 49,51,52Ca; deduced levels, J, π, cross sections, deformation lengths. Optical model analysis. Comparison with previous experimental data. 48,49,50,51,52Ca; Systematics of (p, p'), octupole states and level structure data.

doi: 10.1103/PhysRevC.93.044327
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2015BR10      Phys.Rev. C 92, 034306 (2015)

T.Braunroth, A.Dewald, H.Iwasaki, S.M.Lenzi, M.Albers, V.M.Bader, T.Baugher, T.Baumann, D.Bazin, J.S.Berryman, C.Fransen, A.Gade, T.Ginter, A.Gottardo, M.Hackstein, J.Jolie, A.Lemasson, J.Litzinger, S.Lunardi, T.Marchi, V.Modamio, C.Morse, D.R.Napoli, A.Nichols, F.Recchia, S.R.Stroberg, R.Wadsworth, D.Weisshaar, K.Whitmore, K.Wimmer

Reduced transition strengths of low-lying yrast states in chromium isotopes in the vicinity of N=40

NUCLEAR REACTIONS 9Be(59Mn, 58Cr), E=92.1 MeV/nucleon; 9Be(61Mn, 60Cr), E=91.9 MeV/nucleon; 9Be(63Mn, 62Cr), E=98 MeV/nucleon, [secondary 59,61,63Mn beams from 9Be(82Se, X), E=140 MeV/nucleon primary reaction using A1900 separator at NSCL-MSU]; measured Eγ, Iγ, beam-like recoil particle spectra and yields, (particle)γ-coin, level half-lives by recoil-distance Doppler-shift (RDDS) method using S800 spectrograph and SeGA array. 58,60,62Cr; deduced levels, J, π, B(E2), intrinsic quadrupole moments Q0 and deformation parameter β2. Comparison with calculations using shell-model with LNPS interactions, realistic shell-model, and IBM-2. Systematics of energies and B(E2) for first 2+ states in N=22-52, Ti, Cr, Fe, Ni, Se and Kr nuclei. Systematics of ratios of energies and B(E2) values for first 2+, 4+ and 6+ states in 52,54,56,58,60,62Cr, and E(5) limit.

doi: 10.1103/PhysRevC.92.034306
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2015CH25      Phys.Rev. C 91, 044309 (2015)

C.J.Chiara, D.Weisshaar, R.V.F.Janssens, Y.Tsunoda, T.Otsuka, J.L.Harker, W.B.Walters, F.Recchia, M.Albers, M.Alcorta, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, P.F.Bertone, C.M.Campbell, M.P.Carpenter, J.Chen, H.L.Crawford, H.M.David, D.T.Doherty, A.Gade, C.R.Hoffman, M.Honma, F.G.Kondev, A.Korichi, C.Langer, N.Larson, T.Lauritsen, S.N.Liddick, E.Lunderberg, A.O.Macchiavelli, S.Noji, C.Prokop, A.M.Rogers, D.Seweryniak, N.Shimizu, S.R.Stroberg, S.Suchyta, Y.Utsuno, S.J.Williams, K.Wimmer, S.Zhu

Identification of deformed intruder states in semi-magic 70Ni

NUCLEAR REACTIONS 208Pb(70Zn, X)70Ni, E=440 MeV; measured Eγ, Iγ, prompt- and delayed-γ spectra, γγ-coin, γγ(θ) using Gammasphere array at ATLAS-ANL facility. 9Be(82Se, X)70Ni, E=140 MeV/nucleon; measured Eγ, Iγ, (70Ni)γ-, γγ-coin, prompt and delayed γ rays using S800 spectrograph, GRETINA and CsI(Na) arrays at NSCL-MSU facility. 70Ni; deduced levels, J, π. Comparison with Monte Carlo shell-model calculations.

NUCLEAR STRUCTURE 68,70Ni, 92Mo; calculated levels, J, π, potential-energy surface contours in (Q2, Q4) plane. Shell-model using jj44bpn, jj44pna, JUN45, and JUN45 effective interactions, and Monte Carlo shell-model with A3DA interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.044309
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2015HE22      Phys.Rev. C 92, 024315 (2015)

T.W.Henry, M.A.Bentley, R.M.Clark, P.J.Davies, V.M.Bader, T.Baugher, D.Bazin, C.W.Beausang, J.S.Berryman, A.M.Bruce, C.M.Campbell, H.L.Crawford, M.Cromaz, P.Fallon, A.Gade, J.Henderson, H.Iwasaki, D.G.Jenkins, I.Y.Lee, A.Lemasson, S.M.Lenzi, A.O.Macchiavelli, D.R.Napoli, A.J.Nichols, S.Paschalis, M.Petri, F.Recchia, J.Rissanen, E.C.Simpson, S.R.Stroberg, R.Wadsworth, D.Weisshaar, A.Wiens, C.Walz

Triplet energy differences and the low lying structure of 62Ga

NUCLEAR REACTIONS 9Be(64Ga, 62Ga), (65Ge, 62Ga), E not given, [secondary 64Ga and 65Ge beams extracted using A1900 separator from 9Be(78Kr, X), E=150 MeV/nucleon primary reaction]; measured Eγ, Iγ, 62Ga particle spectra, (62Ga)γ-, γγ-coin using Gamma-Ray Energy Tracking In-Beam Nuclear Array (GRETINA) for γ rays and S800 spectrograph and cathode readout drift chambers for particles at NSCL-MSU facility. 62Ga; deduced levels populated by 2n and 1p2n knockout reactions, J, π, isospin using triplet energy differences (TED) as guide. Comparison with shell-model predictions of low lying T=0 and T=1 states using ANTOINE and LNPS interactions. Cross section calculations for the knockout process.

COMPILATION A=22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 62, 66, 74; reviewed systematics of triplet energy differences (TED) for the known T=1, 2+ states.

doi: 10.1103/PhysRevC.92.024315
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2015JO03      Acta Phys.Pol. B46, 537 (2015)

K.L.Jones, S.Ahn, J.M.Allmond, A.Ayres, D.W.Bardayan, T.Baugher, D.Bazin, J.S.Berryman, A.Bey, C.Bingham, L.Cartegni, G.Cerizza, K.Y.Chae, J.A.Cizewski, A.Gade, A.Galindo-Uribarri, R.F.Garcia Ruiz, R.Grzywacz, M.E.Howard, R.L.Kozub, J.F.Liang, B.Manning, M.MatoS, S.McDaniel, D.Miller, C.D.Nesaraja, P.D.O'Malley, S.Padgett, E.Padilla-Rodal, S.D.Pain, S.T.Pittman, D.C.Radford, A.Ratkiewicz, K.T.Schmitt, A.Shore, M.S.Smith, D.W.Stracener, S.R.Stroberg, J.Tostevin, R.L.Varner, D.Weisshaar, K.Wimmer, R.Winkler

Recent Direct Reaction Experimental Studies with Radioactive Tin Beams

doi: 10.5506/APhysPolB.46.537
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2015LE17      Phys.Rev. C 92, 054309 (2015)

A.Lepailleur, K.Wimmer, A.Mutschler, O.Sorlin, J.C.Thomas, V.Bader, C.Bancroft, D.Barofsky, B.Bastin, T.Baugher, D.Bazin, V.Bildstein, C.Borcea, R.Borcea, B.A.Brown, L.Caceres, A.Gade, L.Gaudefroy, S.Grevy, G.F.Grinyer, H.Iwasaki, E.Khan, T.Kroll, C.Langer, A.Lemasson, O.Llidoo, J.Lloyd, E.Lunderberg, F.Negoita, F.de Oliveira Santos, G.Perdikakis, F.Recchia, T.Redpath, T.Roger, F.Rotaru, S.Saenz, M.-G.Saint-Laurent, D.Smalley, D.Sohler, M.Stanoiu, S.R.Stroberg, M.Vandebrouck, D.Weisshaar, A.Westerberg

Spectroscopy of 28Na: Shell evolution toward the drip line

NUCLEAR REACTIONS 9Be(36S, X)22N/24O, 26F/27Ne/28Ne/29Na/30Na, E=77.6 MeV/nucleon; measured production yields using LISE spectrometer at GANIL. 9Be(31Mg, 28Na), (32Mg, 28Na), E=95 MeV/nucleon, [secondary 31,32Mg beams from 9Be(48Ca, X), E=140 MeV/nucleon using A1900 separator at NSCL-MSU; measured Eγ, Iγ, (28Na)γ-, γγ-coin, level half-life using S800 spectrograph for 28Na and GRETINA array for γ detection. 28Na; deduced levels, J, π, multipolarity. Comparison with shell-model calculations using WBA-M and USDA interactions. Systematics of binding energies for 26F, 28Na, 30Al. 25O, 26F, 27Ne; calculated levels, J, π using shell-model with WBA-M interaction.

RADIOACTIVITY 28Ne(β-)[from 9Be(36S, X), E=77.6 MeV/nucleon at GANIL]; measured Eγ, Iγ, Eβ, βγ-coin, half-life of 28Ne activity using EXOGAM array for γ detection. 28Na; deduced levels, J, π, β feedings, logft. Comparison with shell model using the USDA interaction. 27,28Al, 27,28Mg, 28Si; observed γ rays from β decay of contaminants.

doi: 10.1103/PhysRevC.92.054309
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2015NI01      Phys.Rev. C 91, 014319 (2015)

A.J.Nichols, R.Wadsworth, M.A.Bentley, P.J.Davies, J.Henderson, D.G.Jenkins, I.Paterson, H.Iwasaki, A.Lemasson, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, A.Gade, C.Morse, S.R.Stroberg, D.Weisshaar, K.Whitmore, K.Wimmer, G.de Angelis, A.Dewald, T.Braunroth, C.Fransen, M.Hackstein, D.Miller

Spectroscopy and lifetime measurements in 66Ge, 69Se, and 65Ga using fragmentation reactions

NUCLEAR REACTIONS 9Be(70Se, 66Ge), (70Se, 69Se), (70Se, 65Ga), (69As, 65Ga), E not given, [secondary 70Se and 69As beams from 9Be(78Kr, X), E=150 MeV/nucleon fragmentation reaction]; measured Eγ, Iγ, level half-lives by γ line-shape method at NSCL-MSU Coupled Cyclotron facility. 65Ga, 66Ge, 69Se; deduced levels, J, π, B(M1), B(E2). Comparison with shell-model calculations using GXPF1A interaction in the fp model space.

doi: 10.1103/PhysRevC.91.014319
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