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NSR database version of April 11, 2024.

Search: Author = B.Elman

Found 35 matches.

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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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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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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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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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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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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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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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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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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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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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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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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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