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NSR database version of April 11, 2024.

Search: Author = D.Rhodes

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

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

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

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

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

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

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

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

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

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

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

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

doi: 10.1103/PhysRevC.107.034306
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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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2023WI06      Phys.Rev. C 108, L051305 (2023)

J.Williams, G.Hackman, K.Starosta, R.S.Lubna, P.Choudhary, P.C.Srivastava, C.Andreoiu, D.Annen, H.Asch, M.D.H.K.G.Badanage, G.C.Ball, M.Beuschlein, H.Bidaman, V.Bildstein, R.Coleman, A.B.Garnsworthy, B.Greaves, G.Leckenby, V.Karayonchev, M.S.Martin, C.Natzke, C.M.Petrache, A.Radich, E.Raleigh-Smith, D.Rhodes, R.Russell, M.Satrazani, P.Spagnoletti, C.E.Svensson, D.Tam, F.Wu, D.Yates, Z.Yu

Identifying the spin-trapped character of the 32Si isomeric state

doi: 10.1103/PhysRevC.108.L051305
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2022CH09      Phys.Rev. C 105, 024319 (2022)

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

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

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

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

doi: 10.1103/PhysRevC.105.024319
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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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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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2022LI54      Phys.Rev. C 106, 044313 (2022)

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

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

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

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

doi: 10.1103/PhysRevC.106.044313
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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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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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2021CH56      Phys.Rev. C 104, 054314 (2021)

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

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

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

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

doi: 10.1103/PhysRevC.104.054314
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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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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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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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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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2020MA37      Phys.Rev.Lett. 125, 102502 (2020)

N.Marginean, D.Little, Y.Tsunoda, S.Leoni, R.V.F.Janssens, B.Fornal, T.Otsuka, C.Michelagnoli, L.Stan, F.C.L.Crespi, C.Costache, R.Lica, M.Sferrazza, A.Turturica, A.D.Ayangeakaa, K.Auranen, M.Barani, P.C.Bender, S.Bottoni, M.Boromiza, A.Bracco, S.Calinescu, C.M.Campbell, M.P.Carpenter, P.Chowdhury, M.Ciemala, N.Cieplicka-Orynczak, D.Cline, C.Clisu, H.L.Crawford, I.E.Dinescu, J.Dudouet, D.Filipescu, N.Florea, A.M.Forney, S.Fracassetti, A.Gade, I.Gheorghe, A.B.Hayes, I.Harca, J.Henderson, A.Ionescu, L.W.Iskra, M.Jentschel, F.Kandzia, Y.H.Kim, F.G.Kondev, G.Korschinek, U.Koster, Krishichayan, M.Krzysiek, T.Lauritsen, J.Li, R.Marginean, E.A.Maugeri, C.Mihai, R.E.Mihai, A.Mitu, P.Mutti, A.Negret, C.R.Nita, A.Olacel, A.Oprea, S.Pascu, C.Petrone, C.Porzio, D.Rhodes, D.Seweryniak, D.Schumann, C.Sotty, S.M.Stolze, R.Suvaila, S.Toma, S.Ujeniuc, W.B.Walters, C.Y.Wu, J.Wu, S.Zhu, S.Ziliani

Shape Coexistence at Zero Spin in 64Ni Driven by the Monopole Tensor Interaction

NUCLEAR REACTIONS 62Ni(18O, 16O), E=39 MeV; 65Cu(11B, 12C), E=26 MeV; 63Ni(n, γ), E thermal; measured reaction products, Eγ, Iγ; analyzed available data from multiple experiments. 64Ni; deduced γ-ray energies, J, π, B(E2). Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.125.102502
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2019AY04      Phys.Rev.Lett. 123, 102501 (2019)

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

Evidence for Rigid Triaxial Deformation in 76Ge from a Model-Independent Analysis

NUCLEAR REACTIONS 208Pb(76Ge, 76Ge'), E=304, 291, 317 MeV; measured reaction products, Eγ, Iγ. 76Ge; deduced γ-ray energies, E2 matrix elements, quadrupole asymmetry for bands, triaxial deformation.

doi: 10.1103/physrevlett.123.102501
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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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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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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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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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