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NSR database version of May 22, 2024.

Search: Author = S.Stroberg

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2024BE11      Phys.Rev.Lett. 132, 182502 (2024)

A.Belley, J.M.Yao, B.Bally, J.Pitcher, J.Engel, H.Hergert, J.D.Holt, T.Miyagi, T.R.Rodriguez, A.M.Romero, S.R.Stroberg, X.Zhang

Ab Initio Uncertainty Quantification of Neutrinoless Double-Beta Decay in 76Ge

RADIOACTIVITY 76Ge(2β-); calculated nuclear matrix elements with uncertainties; deduced Majorana neutrino mass limit. Comparison with availabl e data.

doi: 10.1103/PhysRevLett.132.182502
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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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2023JO01      Phys.Rev. C 107, 014327 (2023)

L.Jokiniemi, T.Miyagi, S.R.Stroberg, J.D.Holt, J.Kotila, J.Suhonen

Ab initio calculation of muon capture on 24Mg

NUCLEAR REACTIONS 24Mg(μ-, ν), E at rest; calculated nuclear matrix elements, capture rates to the lowest levels of 24Na. Valence-space in-medium similarity renormalization group (VS-IMSRG) and nuclear shell model calculations. Comparison to experimental data.

NUCLEAR STRUCTURE 24Mg, 24Na; calculated levels, J, π, B(E2), B(M1), magnetic dipole moments. 24Mg; calculated electric quadrupole moments.

RADIOACTIVITY 24Na(β-); calculated log ft values for decay to excited states in 24Mg.

doi: 10.1103/PhysRevC.107.014327
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2023LE15      Phys.Lett. B 847, 138278 (2023)

S.Lechner, T.Miyagi, Z.Y.Xu, M.L.Bissell, K.Blaum, B.Cheal, C.S.Devlin, R.F.Garcia Ruiz, J.S.M.Ginges, H.Heylen, J.D.Holt, P.Imgram, A.Kanellakopoulos, A.Koszorus, S.Malbrunot-Ettenauer, R.Neugart, G.Neyens, W.Nortershauser, P.Plattner, L.V.Rodriguez, G.Sanamyan, S.R.Stroberg, Y.Utsuno, X.F.Yang, D.T.Yordanov

Electromagnetic moments of the antimony isotopes 112-133Sb

NUCLEAR MOMENTS 113,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133Sb; measured frequencies; deduced hyperfine spectra parameters, hyperfine anomaly, nuclear magnetic dipole and electric quadrupole moments. Comparison with shell model and ab initio calculations. Radioactive antimony (Sb) isotopes were produced at the radioactive ion beam facility ISOLDE-CERN.

doi: 10.1016/j.physletb.2023.138278
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2022CI08      J.Phys.(London) G49, 120502 (2022)

V.Cirigliano, Z.Davoudi, J.Engel, R.J.Furnstahl, G.Hagen, U.Heinz, H.Hergert, M.Horoi, C.W.Johnson, A.Lovato, E.Mereghetti, W.Nazarewicz, A.Nicholson, T.Papenbrock, S.Pastore, M.Plumlee, D.R.Phillips, P.E.Shanahan, S.R.Stroberg, F.Viens, A.Walker-Loud, K.A.Wendt, S.M.Wild

Towards precise and accurate calculations of neutrinoless double-beta decay

RADIOACTIVITY 48Ca(2β-); calculated neutrinoless nuclear matrix elements using chiral-EFT interactions, EDF, IBM, QRPA, SM-pf, SM-sdpf, SM-MBPT, RSM, QMC+SM, IM-GCM, VS-IMSRG, CCSD, CCSD-T1.

doi: 10.1088/1361-6471/aca03e
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2022HE06      Phys.Rev. C 105, 034332 (2022)

J.Henderson, G.Hackman, P.Ruotsalainen, J.D.Holt, S.R.Stroberg, C.Andreoiu, G.C.Ball, N.Bernier, M.Bowry, R.Caballero-Folch, S.Cruz, A.Diaz Varela, L.J.Evitts, R.Frederick, A.B.Garnsworthy, M.Holl, J.Lassen, J.Measures, B.Olaizola, E.O'Sullivan, O.Paetkau, J.Park, J.Smallcombe, C.E.Svensson, K.Whitmore, C.Y.Wu

Coulomb excitation of the ITzI = 1 over 2, A=23 mirror pair

NUCLEAR REACTIONS Ti(23Na, 23Na), E=42.9, 39.4 MeV; Ti(23Mg, 23Mg), E=42.9 MeV; measured reaction products, Eγ, Iγ, (particle)γ. 23Na, 23Mg deduced E2 matrix elements, B(E2), spectroscopic quadrupole moments, δ. GOSIA analysis of Coulomb excitation reactions. Comparison to other experimental data and theoretical calculations (shell model with the USDB interaction and ab initio calculations using the valence-space in-medium similarity renormalization group). TIGRESS array of 14 clover-type HPGe detectors with BGO Compton suppression at TRIUMF-ISAC facility.

doi: 10.1103/PhysRevC.105.034332
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2022HU04      Phys.Rev.Lett. 128, 072502 (2022)

B.S.Hu, J.Padua-Arguelles, S.Leutheusser, T.Miyagi, S.R.Stroberg, J.D.Holt

Ab Initio Structure Factors for Spin-Dependent Dark Matter Direct Detection

doi: 10.1103/PhysRevLett.128.072502
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2022HU13      Nat.Phys. 610, 1196 (2022)

B.Hu, W.Jiang, T.Miyagi, Z.Sun, A.Ekstrom, C.Forssen, G.Hagen, J.D.Holt, T.Papenbrock, S.R.Stroberg, I.Vernon

Ab initio predictions link the neutron skin of 208Pb to nuclear forces

NUCLEAR STRUCTURE 208Pb; analyzed available data; calculated neutron skin using Ab initio, bulk properties.

doi: 10.1038/s41567-022-01715-8
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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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2022MA04      Phys.Rev.Lett. 128, 022502 (2022)

S.Malbrunot-Ettenauer, S.Kaufmann, S.Bacca, C.Barbieri, J.Billowes, M.L.Bissell, K.Blaum, B.Cheal, T.Duguet, R.F.Garcia Ruiz, W.Gins, C.Gorges, G.Hagen, H.Heylen, J.D.Holt, G.R.Jansen, A.Kanellakopoulos, M.Kortelainen, T.Miyagi, P.Navratil, W.Nazarewicz, R.Neugart, G.Neyens, W.Nortershauser, S.J.Novario, T.Papenbrock, T.Ratajczyk, P.-G.Reinhard, L.V.Rodriguez, R.Sanchez, S.Sailer, A.Schwenk, J.Simonis, V.Soma, S.R.Stroberg, L.Wehner, C.Wraith, L.Xie, Z.Y.Xu, X.F.Yang, D.T.Yordanov

Nuclear Charge Radii of the Nickel Isotopes 58-68, 70Ni

NUCLEAR MOMENTS 58,59,60,61,62,63,64,65,66,67,68Ni, 70Ni; measured frequency-time spectrum; deduced isotope shifts, mean-square charge radii. Comparison with ab initio approaches. Collinear laser spectroscopy beam line COLLAPS, ISOLDE/CERN.

doi: 10.1103/PhysRevLett.128.022502
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2022MI01      Phys.Rev. C 105, 014302 (2022)

T.Miyagi, S.R.Stroberg, P.Navratil, K.Hebeler, J.D.Holt

Converged ab initio calculations of heavy nuclei

NUCLEAR STRUCTURE 132Sn; calculated ground-state energy, rms point-proton and point-neutron radii, and neutron skin thickness using many-body perturbation theory (MBPT(2)), Hartree-Fock based many-body perturbation theory (HF-MBPT(3)) to second and third order, and in-medium similarity renormalization group (IMSRG(2)). 127Cd; calculated excitation spectrum computed in valence-space (VS)IMSRG(2) approximation. 126,128,130,132,134,136Sn; calculated energies of the first 2+ states using (VS)IMSRG(2) approximation, and compared with experimental data. Ab initio calculations of atomic nuclei with a proposed novel storage scheme for three-nucleon (3N) interaction matrix elements for the normal-ordered two-body (NO2B) approximation. Relevance to neutron skin of 208Pb, neutrinoless double-β decays and dark matter searches in germanium, selenium, xenon and tellurium.

doi: 10.1103/PhysRevC.105.014302
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2022ST03      Phys.Rev. C 105, 034333 (2022)

S.R.Stroberg, J.Henderson, G.Hackman, P.Ruotsalainen, G.Hagen, J.D.Holt

Systematics of E2 strength in the sd shell with the valence-space in-medium similarity renormalization group

NUCLEAR STRUCTURE 18O, 18,19,21,22Ne, 19,21F, 21,23Na, 21,22,23,25,26Mg, 25,27,34Al, 26,27,29,30Si, 29,31,33P, 30,31,34S, 33,34Ar; calculated B(E2). 14C; calculated energies of first 0+ and 2+ states, neutron and proton quadrupole-excitation amplitudes. Ab initio valence-space in-medium similarity renormalization group (VS-IMSRG) and shell-model calculations with the USDB interaction. Comparison to experimental data.

doi: 10.1103/PhysRevC.105.034333
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2022YA19      Phys.Rev. C 106, 014315 (2022)

J.M.Yao, I.Ginnett, A.Belley, T.Miyagi, R.Wirth, S.Bogner, J.Engel, H.Hergert, J.D.Holt, S.R.Stroberg

Ab initio studies of the double-Gamow-Teller transition and its correlation with neutrinoless double-β decay

RADIOACTIVITY 6,8He, 10Be, 14C, 18,22O, 22Ne, 26,28Mg, 30Si, 34S, 38Ar, 42,44,48,56Ca, 50Cr, 46,52Ti(2β-); A=6-76(2β-); calculated nuclear matrix elements (NMEs) for ground-state-to-ground-state double Gamow-Teller transitions (DGT) and Gamow Teller (GT) 0νββ decay, transition densities of parent nuclei, correlation between the transition densities and NMEs of DGT transitions. Ab initio many body methods by importance-truncated no-core shell model (IT-NCSM) with GXPF1A interaction, valence-space in-medium similarity renormalization group method (VSIMSRG) with EM1.8/2.0 interaction, and in-medium generator coordinate method (IM-GCM). 6He, 10Be, 14C, 18O, 22Ne, 26Mg, 30Si, 34S, 38Ar, 42,44Ca, 46Ti, 50Cr; 2β- decay mode forbidden for these nuclei due to negative Q values, however, on query, authors mentioned that these nuclei were included for NMEs for 0νββ decays as these involved the same decay operators that determine the allowed decay rates, thus helpful to benchmark many-body approaches for the nuclear matrix elements of neutrinoless double beta decay.

doi: 10.1103/PhysRevC.106.014315
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2021BE03      Phys.Rev.Lett. 126, 042502 (2021)

A.Belley, C.G.Payne, S.R.Stroberg, T.Miyagi, J.D.Holt

Ab Initio Neutrinoless Double-Beta Decay Matrix Elements for 48Ca, 76Ge, and 82Se

RADIOACTIVITY 48Ca, 76Ge, 82Se(2β-); calculated basis-space converged neutrinoless ββ-decay nuclear matrix elements for the lightest candidates using ab initio in-medium similarity renormalization group to construct valence-space Hamiltonians and consistently transformed ββ-decay operators.

doi: 10.1103/PhysRevLett.126.042502
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2021BE31      Phys.Rev. C 104, 059801 (2021)

G.F.Bertsch, S.R.Stroberg

Comment on "Reexamining the relation between the binding energy of finite nuclei and the equation of state of infinite nuclear matter"

NUCLEAR STRUCTURE 208Pb; calculated binding energy at saturation density and symmetry energy in a comment to paper by 2020At02: Phys. Rev. C 102, 044333.

doi: 10.1103/PhysRevC.104.059801
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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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2021MA46      Phys.Rev. C 104, 014324 (2021)

M.S.Martin, S.R.Stroberg, J.D.Holt, K.G.Leach

Testing isospin symmetry breaking in ab initio nuclear theory

NUCLEAR STRUCTURE A=10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 62, 66, 70, 74; calculated coefficients of the isobaric multiplet mass equation (IMME) using the valence-space in-medium similarity renormalization group (VS-IMSRG) method, and two different Hamiltonians from chiral effective field theory. Comparison with experimental results for all T=1 isobaric analog triplets of relevance to superallowed β decay.

doi: 10.1103/PhysRevC.104.014324
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2021MA73      Phys.Rev. C 104, L051302 (2021)

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

Data-driven configuration-interaction Hamiltonian extrapolation to 60Ca

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

doi: 10.1103/PhysRevC.104.L051302
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2021MO23      Nat.Phys. 17, 1099 (2021)

M.Mougeot, D.Atanasov, J.Karthein, R.N.Wolf, P.Ascher, K.Blaum, K.Chrysalidis, G.Hagen, J.D.Holt, W.J.Huang, G.R.Jansen, I.Kulikov, Yu.A.Litvinov, D.Lunney, V.Manea, T.Miyagi, T.Papenbrock, L.Schweikhard, A.Schwenk, T.Steinsberger, S.R.Stroberg, Z.H.Sun, A.Welker, F.Wienholtz, S.G.Wilkins, K.Zuber

Mass measurements of 99-101In challenge ab initio nuclear theory of the nuclide 100Sn

NUCLEAR REACTIONS La(p, X)99In/100In/101In, E=1.4 GeV; measured reaction products, TOF; deduced atomic masses. Comparison with AME2020, theoretical calculations.

doi: 10.1038/s41567-021-01326-9
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2021ST03      Phys.Rev.Lett. 126, 022501 (2021)

S.R.Stroberg, J.D.Holt, A.Schwenk, J.Simonis

Ab Initio Limits of Atomic Nuclei

NUCLEAR STRUCTURE Z=1-26; calculated probabilities for given isotopes to be bound with respect to one- or two-neutron (proton) removals, separation energies, dripline using a chiral two- and three-nucleon interaction with good saturation properties, we use the valence-space in-medium similarity renormalization group. Comparison with available data.

doi: 10.1103/PhysRevLett.126.022501
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2021YA03      Phys.Rev. C 103, 014315 (2021)

J.M.Yao, A.Belley, R.Wirth, T.Miyagi, C.G.Payne, S.R.Stroberg, H.Hergert, J.D.Holt

Ab initio benchmarks of neutrinoless double-β decay in light nuclei with a chiral Hamiltonian

RADIOACTIVITY 6,8He, 10Be, 14C, 22O(2β-); calculated nuclear matrix elements (NMEs) for isospin-conserving and isospin-changing 0νββ decay modes. Valence-space in-medium similarity renormalization group (VS-IMSRG) and importance-truncated no-core shell model (IT-NCSM) calculations. Comparison with results of calculations using NCSM and coupled-cluster theory with singles and doubles plus leading-order triples excitations (CC-SDT1).

NUCLEAR STRUCTURE 6,8He, 6,8,10Be, 10,14C, 14,22O, 22Ne; calculated energies per nucleon (E/A) using VS-IMSRG, in-medium generator coordinate (IM-GCM), and IT-NCSM calculations, and compared with those from the CC-SDT1 calculations.

doi: 10.1103/PhysRevC.103.014315
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2020CO01      Phys.Lett. B 800, 135071 (2020)

M.L.Cortes, W.Rodriguez, P.Doornenbal, A.Obertelli, J.D.Holt, S.M.Lenzi, J.Menendez, F.Nowacki, K.Ogata, A.Poves, T.R.Rodriguez, A.Schwenk, J.Simonis, S.R.Stroberg, K.Yoshida, L.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, O.Aktas, T.Aumann, L.X.Chung, F.Flavigny, S.Franchoo, I.Gasparic, R.-B.Gerst, J.Gibelin, K.I.Hahn, D.Kim, T.Koiwai, Y.Kondo, P.Koseoglou, J.Lee, C.Lehr, B.D.Linh, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, D.Sohler, P.-A.Soderstrom, S.Takeuchi, H.Toernqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

Shell evolution of N=40 isotones towards 60Ca: First spectroscopy of 62Ti

NUCLEAR REACTIONS 1H(63V, 2p)62Ti, E≈200 MeV/nucleon, [secondary 63V beam from 9Be(70Zn, X), E=345 MeV/nucleon primary reaction followed by separation of fragments of interest event-by-event using BigRIPS spectrometer at RIBF-RIKEN]; measured yields of reaction products with Z=22-24 and A/Q=2.60 to 2.85, Eγ, Iγ, γγ-coin using MINOS device, SAMURAI dipole magnet, Time Projection Chamber (TPC), and DALI2+ array of 226 NaI(Tl) detectors. 62Ti; deduced first 2+ and 4+ levels, cross sections. Comparison with theoretical calculations for N=40, Z=20-32 (even) using large-scale shell model (LSSM), symmetry conserving configuration mixing (SCCM) with Gogny D1S effective interaction, and valence-space in-medium similarity renormalization group (VS-IMSRG).

doi: 10.1016/j.physletb.2019.135071
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2634. Data from this article have been entered in the XUNDL database. For more information, click here.


2020HE23      Phys.Rev. C 102, 031303 (2020)

J.Henderson, S.R.Stroberg

Examination of the inversion of isobaric analogue states in mirror nuclei

NUCLEAR STRUCTURE A=19, 59; analyzed available experimental data for odd-odd and odd-mass mirror pairs for energy splitting between the states in the N>Z nuclei, probability of inversion of a pair of states; deduced similar energy difference between different isobaric analogue states (IASs) in the mirror pairs, and the likelihood of normal isospin-symmetry-breaking behavior causing level inversions. 73Sr, 73Br; discussed recent experimental observation of inversion of the ground- and first-excited-states in the mirror pair.

doi: 10.1103/PhysRevC.102.031303
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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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2020MI15      Phys.Rev. C 102, 034320 (2020)

T.Miyagi, S.R.Stroberg, J.D.Holt, N.Shimizu

Ab initio multishell valence-space Hamiltonians and the island of inversion

NUCLEAR STRUCTURE 16O; calculated levels, J, π, single-particle energies with 4He core and psd valence space, ground-state energies and expectation values of the Hamiltonian with the 4He and p, pd5/2, pd5/2s1/2, and psd valence spaces. 26,28,30,32,34Ne, 28,30,32,34,36Mg, 30,32,34,36,38Si; calculated excitation energies of the first excited 0+ states, and the number of exciting neutrons from sd to pf orbits. 20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37Ne, 22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39Mg, 24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42Si; calculated ground-state energies, S(2n), energies of the first 2+ states and corresponding B(E2) values for even-even nuclei. 26,30Ne, 32Mg, 34Si; calculated energies and B(E2) of the 0+ and 2+ excited states from sd and sdf7/2p3/2 orbitals. 14,15,16,17,18,19,20,21,22O; calculated ground-state energies and charge radii. 40,41,42,43,44,45,46,47,48Ca; calculated changes in charge radii. Valence-space in-medium similarity renormalization group (VS-IMSRG) approach to derive the first multishell valence-space Hamiltonians from ab initio theory for calculation of properties of nuclei in the island-of-inversion region above oxygen. Comparison with experimental data.

doi: 10.1103/PhysRevC.102.034320
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2020ZH30      Phys.Rev.Lett. 125, 112503 (2020)

X.Zhang, S.R.Stroberg, P.Navratil, C.Gwak, J.A.Melendez, R.J.Furnstahl, J.D.Holt

Ab Initio Calculations of Low-Energy Nuclear Scattering Using Confining Potential Traps

NUCLEAR REACTIONS 4He, 24O(n, n), E<3.5 MeV; calculated phase shifts and error bands.

doi: 10.1103/PhysRevLett.125.112503
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2019BA11      Phys.Lett. B 790, 251 (2019)

S.Bagchi, R.Kanungo, W.Horiuchi, G.Hagen, T.D.Morris, S.R.Stroberg, T.Suzuki, F.Ameil, J.Atkinson, Y.Ayyad, D.Cortina-Gil, I.Dillmann, A.Estrade, A.Evdokimov, F.Farinon, H.Geissel, G.Guastalla, R.Janik, S.Kaur, R.Knobel, J.Kurcewicz, Yu.A.Litvinov, M.Marta, M.Mostazo, I.Mukha, C.Nociforo, H.J.Ong, S.Pietri, A.Prochazka, C.Scheidenberger, B.Sitar, P.Strmen, M.Takechi, J.Tanaka, Y.Tanaka, I.Tanihata, S.Terashima, J.Vargas, H.Weick, J.S.Winfield

Neutron skin and signature of the N = 14 shell gap found from measured proton radii of 17-22N

NUCLEAR REACTIONS C(14N, X), (15N, X), (17N, X), (18N, X), (19N, X), (20N, X), (21N, X), (22N, X), E=851-932 MeV/nucleon; measured reaction products. 14,15,17,18,19,20,21,22N; deduced σ, root mean square point proton and matter radii, unconventional shell gap at N = 14 arising from the attractive proton–neutron tensor interaction. Comparison with ab initio calculations.

doi: 10.1016/j.physletb.2019.01.024
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2019GY02      Nat.Phys. 15, 428 (2019)

P.Gysbers, G.Hagen, J.D.Holt, G.R.Jansen, T.D.Morris, P.Navratil, T.Papenbrock, S.Quaglioni, A.Schwenk, S.R.Stroberg, K.A.Wendt

Discrepancy between experimental and theoretical β-decay rates resolved from first principles

NUCLEAR STRUCTURE 3H, 6Li, 7Be, 8He, 10C, 14O, 19,24Ne, 37K, 25,28Al, 24,26Na, 30Mg, 33,34P, 42,43,46Sc, 42,45Ti, 45,47V, 100Sn; calculated the Gamow–Teller strength for β decay.

doi: 10.1038/s41567-019-0450-7
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2019LE11      Phys.Rev. C 100, 014320 (2019)

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

High-resolution (p, t) reaction measurements as spectroscopic tests of ab-initio theory in the mid-pf shell

NUCLEAR REACTIONS 52Cr, 64Zn(p, t), (p, p), E=24 MeV; measured Ep, Ip, E(t), I(t), differential σ(θ) using Q3D spectrometer at the MLL, Garching tandem accelerator facility; deduced optical model parameters. 50Cr, 62Zn; deduced levels, J, π. Comparison with ab-initio shell-model calculations using chiral effective field theory with the valence-space in-medium similarity renormalization group method (VS-IMSRG), and with evaluated data in the ENSDF database.

doi: 10.1103/PhysRevC.100.014320
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2019MI17      Phys.Rev. C 100, 034310 (2019)

T.Miyagi, T.Abe, M.Kohno, P.Navratil, R.Okamoto, T.Otsuka, N.Shimizu, S.R.Stroberg

Ground-state properties of doubly magic nuclei from the unitary-model-operator approach with chiral two- and three-nucleon forces

NUCLEAR STRUCTURE 4He, 16O, 40Ca; calculated ground-state energies, root-mean square (rms) radii, charge radii. Unitary-model-operator approach (UMOA), with similarity renormalization group (SRG) evolved nucleon-nucleon (NN) and three-nucleon (3N) interactions based on chiral effective field theory. Comparison with experimental data.

doi: 10.1103/PhysRevC.100.034310
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2019RA06      Phys.Rev. C 99, 021301 (2019)

J.S.Randhawa, R.Kanungo, M.Holl, J.D.Holt, P.Navratil, S.R.Stroberg, G.Hagen, G.R.Jansen, M.Alcorta, C.Andreoiu, C.Barnes, C.Burbadge, D.Burke, A.A.Chen, A.Chester, G.Christian, S.Cruz, B.Davids, J.Even, G.Hackman, J.Henderson, S.Ishimoto, P.Jassal, S.Kaur, M.Keefe, D.Kisliuk, R.Krucken, J.Liang, J.Lighthall, E.McGee, J.Measures, M.Moukaddam, E.Padilla-Rodal, A.Shotter, I.J.Thompson, J.Turko, M.Williams, O.Workman

Observation of excited states in 20Mg sheds light on nuclear forces and shell evolution

NUCLEAR REACTIONS 2H(20Mg, d), (20Mg, d'), E=8.5 MeV/nucleon, [secondary 20Mg beam produced in Si(p, X), E=480 MeV fragmentation reaction using SiC target at ISAC-II facility]; measured scattered deuteron spectra, differential σ(θ) using annular single-sided silicon strip detector array and CsI(Tl) detectors (IRIS reaction spectroscopy facility) at TRIUMF. 20Mg; deduced levels, J, π, proton-unbound resonances. Comparison with ab initio calculations using the valence-space in-medium similarity renormalization-group (VS-IMSRG) approach.

doi: 10.1103/PhysRevC.99.021301
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2019RU02      Phys.Rev. C 99, 051301 (2019)

P.Ruotsalainen, J.Henderson, G.Hackman, G.H.Sargsyan, K.D.Launey, A.Saxena, P.C.Srivastava, S.R.Stroberg, T.Grahn, J.Pakarinen, G.C.Ball, R.Julin, P.T.Greenlees, J.Smallcombe, C.Andreoiu, N.Bernier, M.Bowry, M.Buckner, R.Caballero-Folch, A.Chester, S.Cruz, L.J.Evitts, R.Frederick, A.B.Garnsworthy, M.Holl, A.Kurkjian, D.Kisliuk, K.G.Leach, E.McGee, J.Measures, D.Mucher, J.Park, F.Sarazin, J.K.Smith, D.Southall, K.Starosta, C.E.Svensson, K.Whitmore, M.Williams, C.Y.Wu

Isospin symmetry in B(E2) values: Coulomb excitation study of 21Mg

NUCLEAR REACTIONS 196Pt(21Mg, 21Mg'), E=95 MeV; 110Pd(21Mg, 21Mg'), E=67 MeV; measured Eγ, Iγ, (particle)γ-coin, Coulomb excitation yields, half-life of the 1/2+ state in 21Mg using BAMBINO array for particle detection, and TIGRESS array for γ rays from Coulomb excited 21Mg states at TRIUMF-ISAC-II facility. 21Mg; deduced levels, J, π, Coulomb-excitation yields, E2 matrix elements, B(E2). GOSIA least-squares fit analysis. Systematics of 5/2+ to 1/2+ B(E2) values in T=-3/2 and +3/2 mirror nuclei: 21Mg, 21Fl; 25Si, 25Na; 29S, 29Al; 33Ar, 33P; 37Ca, 37Cl. Comparison with shell-model calculations with isospin conserving and breaking USD interactions, and using modern ab initio approach.

doi: 10.1103/PhysRevC.99.051301
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2019TA10      Nature(London) 569, 53 (2019)

R.Taniuchi, C.Santamaria, P.Doornenbal, A.Obertelli, K.Yoneda, G.Authelet, H.Baba, D.Calvet, F.Chateau, A.Corsi, A.Delbart, J.-M.Gheller, A.Gillibert, J.D.Holt, T.Isobe, V.Lapoux, M.Matsushita, J.Menendez, S.Momiyama, T.Motobayashi, M.Niikura, F.Nowacki, K.Ogata, H.Otsu, T.Otsuka, C.Péron, S.Peru, A.Peyaud, E.C.Pollacco, A.Poves, J.-Y.Rousse, H.Sakurai, A.Schwenk, Y.Shiga, J.Simonis, S.R.Stroberg, S.Takeuchi, Y.Tsunoda, T.Uesaka, H.Wang, F.Browne, L.X.Chung, Z.Dombradi, S.Franchoo, F.Giacoppo, A.Gottardo, K.Hadynska-Klek, Z.Korkulu, S.Koyama, Y.Kubota, J.Lee, M.Lettmann, C.Louchart, R.Lozeva, K.Matsui, T.Miyazaki, S.Nishimura, L.Olivier, S.Ota, Z.Patel, E.Sahin, C.Shand, P.-A.Soderstrom, I.Stefan, D.Steppenbeck, T.Sumikama, D.Suzuki, Z.Vajta, V.Werner, J.Wu, Z.Y.Xu

78Ni revealed as a doubly magic stronghold against nuclear deformation

NUCLEAR REACTIONS 1H(79Cu, 2p), (80Zn, 3p)78Ni, E ∼ 250 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced partial σ, energy levels, J, π, magic nature. Comparison with theoretical calculations.

doi: 10.1038/s41586-019-1155-x
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2019XU09      Phys.Rev. C 99, 064303 (2019)

X.Xu, M.Wang, K.Blaum, J.D.Holt, Yu.A.Litvinov, A.Schwenk, J.Simonis, S.R.Stroberg, Y.H.Zhang, H.S.Xu, P.Shuai, X.L.Tu, X.H.Zhou, F.R.Xu, G.Audi, R.J.Chen, X.C.Chen, C.Y.Fu, Z.Ge, W.J.Huang, S.Litvinov, D.W.Liu, Y.H.Lam, X.W.Ma, R.S.Mao, A.Ozawa, B.H.Sun, Y.Sun, T.Uesaka, G.Q.Xiao, Y.M.Xing, T.Yamaguchi, Y.Yamaguchi, X.L.Yan, Q.Zeng, H.W.Zhao, T.C.Zhao, W.Zhang, W.L.Zhan

Masses of neutron-rich 52-54Sc and 54, 56Ti nuclides: The N=32 subshell closure in scandium

ATOMIC MASSES 52,53,54Sc, 54,56Ti; measured mass excesses using isochronous mass spectrometry at CRSe-HIRFL, Lanzhou. Isotopes produced in 9Be(86Kr, X), E=460.65 MeV/nucleon reaction and separated using RIBLL2. Comparison with AME-2012 evaluation, and results from six previous experiments, and with valence-space in-medium similarity renormalization group (VS-IMSRG) calculations. Systematics of S(2n) values in N=27-34 K, Ca, Sc, Ti isotopic chains, and those of empirical shell gaps in N=24-34 K, Ca, Sc, Ti isotopic chains and Z=19-25 N=32 isotones.

doi: 10.1103/PhysRevC.99.064303
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2018EV01      Phys.Lett. B 779, 396 (2018)

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

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

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

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

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

Nuclear Structure Studied with Direct Reactions for Fundamental Symmetry Tests

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

doi: 10.5506/APhysPolB.49.229
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2018HE12      Phys.Lett. B 782, 468 (2018)

J.Henderson, G.Hackman, P.Ruotsalainen, S.R.Stroberg, K.D.Launey, J.D.Holt, F.A.Ali, N.Bernier, M.A.Bentley, M.Bowry, R.Caballero-Folch, L.J.Evitts, R.Frederick, A.B.Garnsworthy, P.E.Garrett, B.Jigmeddorj, A.I.Kilic, J.Lassen, J.Measures, D.Muecher, B.Olaizola, E.O'Sullivan, O.Paetkau, J.Park, J.Smallcombe, C.E.Svensson, R.Wadsworth, C.Y.Wu

Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of 22Mg

NUCLEAR REACTIONS 110Pd(22Mg, 22Mg'), (22Ne, 22Ne'), E=83.4, 92.4 MeV; measured reaction products, Eγ, Iγ. 22Ne, 22Mg; deduced γ-ray energies, B(E2) values and quadrupole moments. Comparison with the state-of-the-art no-core symplectic shell model calculations.

doi: 10.1016/j.physletb.2018.05.064
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2018IZ01      Phys.Rev. C 97, 014309 (2018)

C.Izzo, G.Bollen, M.Brodeur, M.Eibach, K.Gulyuz, J.D.Holt, J.M.Kelly, M.Redshaw, R.Ringle, R.Sandler, S.Schwarz, S.R.Stroberg, C.S.Sumithrarachchi, A.A.Valverde, A.C.C.Villari

Precision mass measurements of neutron-rich Co isotopes beyond N=40

ATOMIC MASSES 68,69Co; measured time-of-flight ion cyclotron resonances (TOF-ICR), mass excesses using LEBIT Penning trap system at NSCL-MSU facility. Comparison with AME-2016 values. Systematics of S(2n) values in N=36-44 Fe, Co, Ni and Cu nuclides. Discussed low- and high-spin isomers in 68Co and 69Co, and concluded the main contribution from the high-spin activities.

RADIOACTIVITY 68,69Co(β-)[from 9Be(76Ge, X), E=130 MeV/nucleon followed by fragment selection using A1900 fragment separator]; measured Eγ, Iγ from the decay of 68Co. 68,69Co; calculated levels, J, π by ab initio approach using the valence-space in-medium similarity renormalization group (VS-IMSRG) framework based on two-nucleon (NN) and three-nucleon (3N) forces from chiral effective field theory; discussed energy ordering of the ground state and isomer.

doi: 10.1103/PhysRevC.97.014309
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2018LE03      Phys.Rev.Lett. 120, 062503 (2018)

E.Leistenschneider, M.P.Reiter, S.Ayet San Andres, B.Kootte, J.D.Holt, P.Navratil, C.Babcock, C.Barbieri, B.R.Barquest, J.Bergmann, J.Bollig, T.Brunner, E.Dunling, A.Finlay, H.Geissel, L.Graham, F.Greiner, H.Hergert, C.Hornung, C.Jesch, R.Klawitter, Y.Lan, D.Lascar, K.G.Leach, W.Lippert, J.E.McKay, S.F.Paul, A.Schwenk, D.Short, J.Simonis, V.Soma, R.Steinbrugge, S.R.Stroberg, R.Thompson, M.E.Wieser, C.Will, M.Yavor, C.Andreoiu, T.Dickel, I.Dillmann, G.Gwinner, W.R.Plass, C.Scheidenberger, A.A.Kwiatkowski, J.Dilling

Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes

ATOMIC MASSES 51V, 51,52,53,54,55Ti, 52,53,54,55Cr; measured radio frequencies, TOF; deduced mass excesses. Comparison with the AME16 recommended values.

doi: 10.1103/PhysRevLett.120.062503
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2018MO07      Phys.Rev.Lett. 120, 152503 (2018)

T.D.Morris, J.Simonis, S.R.Stroberg, C.Stumpf, G.Hagen, J.D.Holt, G.R.Jansen, T.Papenbrock, R.Roth, A.Schwenk

Structure of the Lightest Tin Isotopes

NUCLEAR STRUCTURE 100,108,116,124,132Sn, 101Sn, 105Te; calculated energy levels, J, π using nucleon-nucleon and three-nucleon forces constrained by data of few-nucleon systems.

doi: 10.1103/physrevlett.120.152503
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2018MO14      Phys.Rev.Lett. 120, 232501 (2018)

M.Mougeot, D.Atanasov, K.Blaum, K.Chrysalidis, T.Day Goodacre, D.Fedorov, V.Fedosseev, S.George, F.Herfurth, J.D.Holt, D.Lunney, V.Manea, B.Marsh, D.Neidherr, M.Rosenbusch, S.Rothe, L.Schweikhard, A.Schwenk, C.Seiffert, J.Simonis, S.R.Stroberg, A.Welker, F.Wienholtz, R.N.Wolf, K.Zuber

Precision Mass Measurements of 58-63Cr: Nuclear Collectivity Towards the N=40 Island of Inversion

ATOMIC MASSES 58,59,60,61,62,63Cr; measured cyclotron frequency, TOF; deduced mass excesses. Comparison with AME16, theoretical calculations.

doi: 10.1103/PhysRevLett.120.232501
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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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2017AL11      Eur.Phys.J. A 53, 62 (2017)

J.M.Allmond, C.W.Beausang, T.J.Ross, P.Humby, M.S.Basunia, L.A.Bernstein, D.L.Bleuel, W.Brooks, N.Brown, J.T.Burke, B.K.Darakchieva, K.R.Dudziak, K.E.Evans, P.Fallon, H.B.Jeppesen, J.D.LeBlanc, S.R.Lesher, M.A.McMahan, D.A.Meyer, L.Phair, J.O.Rasmussen, N.D.Scielzo, S.R.Stroberg, M.Wiedeking

Particle-γ coincidence spectroscopy of the N = 90 nucleus 154Gd by (p, tγ)

NUCLEAR REACTIONS 156Gd(p, tγ)154Gd, E=25 MeV; measured Eγ, Iγ(θ), γ∓coin, E(t), I(t), tγ-coin using segmented Si telescope array and HPGe array; deduced triton energy spectra, σ(θ) to discrete states. 154Gd; deduced level scheme, rotational bands. Compared with other (p, t) and (t, p) data.

doi: 10.1140/epja/i2017-12253-2
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2017BR14      Phys.Rev. C 96, 034316 (2017)

M.Brodeur, A.A.Kwiatkowski, O.M.Drozdowski, C.Andreoiu, D.Burdette, A.Chaudhuri, U.Chowdhury, A.T.Gallant, A.Grossheim, G.Gwinner, H.Heggen, J.D.Holt, R.Klawitter, J.Lassen, K.G.Leach, A.Lennarz, C.Nicoloff, S.Raeder, B.E.Schultz, S.R.Stroberg, A.Teigelhofer, R.Thompson, M.Wieser, J.Dilling

Precision mass measurements of magnesium isotopes and implications for the validity of the isobaric mass multiplet equation

ATOMIC MASSES 27,28,29Mg; measured cyclotron frequencies, mass excesses using TITAN Penning trap at ISAC-TRIUMF facility; deduced S(p). Comparison with AME-2016 evaluated data, and with ab initio calculations from the valence-space in-medium similarity renormalization group. 27,28,29Mg produced in SiC(p, X), E=480 MeV reaction, followed by laser resonance ionization in a radio-frequency ion guide (IG-LIS).29Mg, 29Cl, 30Mg, 30Ar; analyzed isobaric mass multiplet equation (IMME) in the form of a cubic term. 28S, 29Cl; need to confirm mass excess of 28S and S(n) of 29Cl.

doi: 10.1103/PhysRevC.96.034316
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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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2017GA25      Phys.Rev. C 96, 044329 (2017)

A.B.Garnsworthy, M.Bowry, B.Olaizola, J.D.Holt, S.R.Stroberg, S.Cruz, S.Georges, G.Hackman, A.D.MacLean, J.Measures, H.P.Patel, C.J.Pearson, C.E.Svensson

Spectroscopy of 50Sc and ab initio calculations of B(M3) strengths

RADIOACTIVITY 50Ca(β-)[from Ta(p, X), E=500 MeV at TRIUMF-ISAC facility]; measured Eγ, Iγ, γγ-coin, γγ(θ), level half-lives by γγ(t) using GRIFFIN array of clover HPGe detectors, LaBr3(Ce) scintillators for fast timing, and plastic scintillator array SCEPTAR for β particles. 50Sc; deduced levels, J, π, γ-ray branching ratios, B(M3), B(M1), B(E2), mixing ratio, single-particle-orbital occupation numbers. Comparison with theoretical transition strengths from standard operators and from wave functions produced with the KB3G-pf shell interaction and the valence-space in-medium similarity renormalization group (VS-IMSRG). Comparison of experimental and theoretical B(M3) for transitions in 24Na, 24Al, 34,38Cl, 38K and 50Sc, the theoretical values from ab initio calculations using the VS-IMSRG approach with consistently derived effective Hamiltonians and effective M3 operator.

doi: 10.1103/PhysRevC.96.044329
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2017LA16      Phys.Rev. C 96, 044323 (2017)

D.Lascar, R.Klawitter, C.Babcock, E.Leistenschneider, S.R.Stroberg, B.R.Barquest, A.Finlay, M.Foster, A.T.Gallant, P.Hunt, J.Kelly, B.Kootte, Y.Lan, S.F.Paul, M.L.Phan, M.P.Reiter, B.Schultz, D.Short, J.Simonis, C.Andreoiu, M.Brodeur, I.Dillmann, G.Gwinner, J.D.Holt, A.A.Kwiatkowski, K.G.Leach, J.Dilling

Precision mass measurements of 125-127Cd isotopes and isomers approaching the N=82 closed shell

ATOMIC MASSES 125,125m,126,127,127mCd, 133Cs; measured TOF ion cyclotron resonances, cyclotron frequencies using TITAN-ISOLTRAP-TRIUMF facility; deduced mass excesses. Comparison with AME-2012 evaluated data, and ab initio shell-model calculations using NUSHELLX code, and with IMSRG calculations. The Cd isotopes produced in U(p, F), E=500 MeV protons using uranium carbide target and Ion Guide Laser Ion Source (IG-LIS) at ISAC-TRIUMF facility.

doi: 10.1103/PhysRevC.96.044323
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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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2017PA26      Phys.Rev. C 96, 034324 (2017)

N.M.Parzuchowski, S.R.Stroberg, P.Navratil, H.Hergert, S.K.Bogner

Ab initio electromagnetic observables with the in-medium similarity renormalization group

NUCLEAR STRUCTURE 14C; calculated energies of the ground state and first 2+ state, B(E2) for the first 2+ state. 2H; calculated energy, magnetic dipole moment, electric quadrupole moment and charge radius of the ground state. 6Li; calculated energies of ground-state and first 3+ state, quadrupole moments, B(M1), B(E2). 6He, 14C, 22O, 32S, 48Ca, 56,60Ni; calculated energies and B(E2) of first 2+ states. 14N; calculated energy and B(M1) of the first excited 0+ state. 32S, 32Cl; calculated energies, B(M1) and magnetic-dipole moments of first 1+ states. 16O, 40Ca; calculated energies and B(E3) of first 3- states. 14C, 22O, 32S; calculated E2 and M1 transition matrix elements. Equations-of-motion in-medium similarity renormalization group (EOM-IMSRG), and valence-space VS-IMSRG methods. Comparison with available experimental values, and theoretical calculations from no-core shell-model.

doi: 10.1103/PhysRevC.96.034324
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2017RE10      Phys.Rev. C 96, 052501 (2017)

M.P.Reiter, K.G.Leach, O.M.Drozdowski, S.R.Stroberg, J.D.Holt, C.Andreoiu, C.Babcock, B.Barquest, M.Brodeur, A.Finlay, M.Foster, A.T.Gallant, G.Gwinner, R.Klawitter, B.Kootte, A.A.Kwiatkowski, Y.Lan, D.Lascar, E.Leistenschneider, A.Lennarz, S.Paul, R.Steinbrugge, R.I.Thompson, M.Wieser, J.Dilling

High-precision QEC-value measurement of the superallowed β+ emitter 22Mg and an ab initio evaluation of the A=22 isobaric triplet

ATOMIC MASSES 22Mg; measured time-of-flight quadrupole-excitation and Ramsey-excitation resonance spectra using Ion Trap for Atomic and Nuclear Science (TITAN) at TRIUMF; deduced average frequency ratios for the mass measurements. 22Mg, 22Na; deduced mass excesses and Q value for ϵ decay of 22Mg decay to 22Na. Comparison with AME-2016 and Hardy-Towner evaluations. 22Mg, 22Ne, 22Na; deduced new coefficients of the IMME by using state-of-the-art ab initio shell-model calculations of the IAS energies. Relevance to isospin-symmetry-breaking (ISB) correction in superallowed β decays.

doi: 10.1103/PhysRevC.96.052501
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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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2017SI17      Phys.Rev. C 96, 014303 (2017)

J.Simonis, S.R.Stroberg, K.Hebeler, J.D.Holt, A.Schwenk

Saturation with chiral interactions and consequences for finite nuclei

NUCLEAR STRUCTURE 40,54Ca, 56,78Ni; calculated ground-state energies and charge radii using the closed-shell IM-SRG, and compared with evaluated experimental data. 4He, 16,22,24O, 36,40,48,52,54,60Ca, 48,56,68,78Ni; calculated binding energies and charge radii using the IM-SRG for the four Hamiltonians, and compared with evaluated data. 19,20,21,22,23,24,25,26,27,28,29,30,31,32Na, 28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45S, 40,41,42,43,44,45,46,47,48,49,50,51,52,53,54Ca, 48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64Mn, 53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72Ni; calculated ground-state energies and S(2n), charge radii of Mn isotopes, first excited 2+ states of Ca, S and Ni isotopes using the VS-IM-SRG, and compared with experimental data. Calculations used ab initio in-medium similarity renormalization group (IM-SRG) method, and valence-space (VS) IM-SRG for charge radii.

doi: 10.1103/PhysRevC.96.014303
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2017ST03      Phys.Rev.Lett. 118, 032502 (2017)

S.R.Stroberg, A.Calci, H.Hergert, J.D.Holt, S.K.Bogner, R.Roth, A.Schwenk

Nucleus-Dependent Valence-Space Approach to Nuclear Structure

NUCLEAR STRUCTURE 16,18,22O, 10B, 22Na, 46V, C, N, O, Na, Ca, Ni; calculated ground-state energies, J, π, the extension of ab initio nuclear structure calculations.

doi: 10.1103/PhysRevLett.118.032502
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2017ST22      Phys.Rev. C 96, 064310 (2017)

D.Steppenbeck, S.Takeuchi, N.Aoi, P.Doornenbal, M.Matsushita, H.Wang, H.Baba, S.Go, J.D.Holt, J.Lee, K.Matsui, S.Michimasa, T.Motobayashi, D.Nishimura, T.Otsuka, H.Sakurai, Y.Shiga, P.-A.Soderstrom, S.R.Stroberg, T.Sumikama, R.Taniuchi, J.A.Tostevin, Y.Utsuno, J.J.Valiente-Dobon, K.Yoneda

Structure of 55Sc and development of the N=34 subshell closure

NUCLEAR REACTIONS 9Be(56Ti, 55Sc), (55Sc, 55Sc'), E=200 MeV/nucleon, ; [secondary 56Ti and 55Sc beams from primary 70Zn beam and using BigRIPS for fragment identification at RIBF-RIKEN facility]; measured Eγ, Iγ, γγ-coin using DALI2 array of scintillation detectors for γ radiation, and ZeroDegree spectrometer for reaction products. 55Sc; deduced levels. Comparison with large-scale shell-model calculations in sdpf model space, and with ab initio shell-model calculations from the in-medium similarity renormalization group.

NUCLEAR STRUCTURE 55Sc; calculated levels, J, π, σ, spectroscopic factors for one-proton removal reaction; discussed configurations. Large-scale shell-model with SDPF-MUr effective interaction, and ab initio many-body method with the valence-space formulation of the in-medium similarity renormalization group (VS-IM-SRG). Comparison with experimental data, and proton-removal reaction treated with the eikonal model.

doi: 10.1103/PhysRevC.96.064310
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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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2016LA16      Phys.Rev.Lett. 117, 052501 (2016)

V.Lapoux, V.Soma, C.Barbieri, H.Hergert, J.D.Holt, S.R.Stroberg

Radii and Binding Energies in Oxygen Isotopes: A Challenge for Nuclear Forces

NUCLEAR STRUCTURE 14,15,16,17,18,19,20,21,22,23,24O; analyzed available data; calculated proton and neutron radii, binding energies. ab initio calculations with conventional nuclear interactions derived within chiral effective field theory.

doi: 10.1103/PhysRevLett.117.052501
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2016LE10      Phys.Rev. C 94, 011304 (2016)

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

Searching for 0+ states in 50Cr: Implications for the superallowed β decay of 50Mn

NUCLEAR REACTIONS 52Cr(p, t), E=24 MeV; measured E(t), I(t), σ(θ) using Q3D magnetic spectrograph at MLL-Munich. 50Cr; deduced levels, J, π, L-transfers, 0+ states. Coupled-channel, finite-range DWBA analysis using software FRESCO code. Comparison with ab initio shell-model predictions using in-medium similarity renormalization group (IM-SRG) formalism based on NN and 3N forces from chiral-energy density functionals (EFT).Comparison with previous experimental results and evaluated data in the ENSDF database.

RADIOACTIVITY 50Mn(EC); discussed possible Fermi non-analog β transitions to 0+ states at 3895 and 4069 keV assigned in authors' (p, t) work.

doi: 10.1103/PhysRevC.94.011304
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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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2016ST12      Phys.Rev. C 93, 051301 (2016)

S.R.Stroberg, H.Hergert, J.D.Holt, S.K.Bogner, A.Schwenk

Ground and excited states of doubly open-shell nuclei from ab initio valence-space Hamiltonians

NUCLEAR STRUCTURE 19,23,25,26F, 20,22,24,25,26Ne, 24Mg; calculated levels, J, π, yrast states from ab initio in-medium similarity renormalization group (IM-SRG) Hamiltonians based on NN+3N-induced and NN+3N-full Hamiltonians. Comparison with experimental data, and with phenomenological USDB predictions. 17,18,19,20,21,22,23,24,25,26,27,28,29F, 18,19,20,21,22,23,24,25,26,27,28,29,30Ne; calculated ground-state energies from the A-dependent IM-SRG valence-space Hamiltonian. Comparison with AME-2012 values, and the phenomenological USDB interaction.

doi: 10.1103/PhysRevC.93.051301
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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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2015NO04      Phys.Rev. C 92, 024312 (2015)

S.Noji, R.G.T.Zegers, SamM.Austin, T.Baugher, D.Bazin, B.A.Brown, C.M.Campbell, A.L.Cole, H.J.Doster, A.Gade, C.J.Guess, S.Gupta, G.W.Hitt, C.Langer, S.Lipschutz, E.Lunderberg, R.Meharchand, Z.Meisel, G.Perdikakis, J.Pereira, F.Recchia, H.Schatz, M.Scott, S.R.Stroberg, C.Sullivan, L.Valdez, C.Walz, D.Weisshaar, S.J.Williams, K.Wimmer

Gamow-Teller transitions to 45Ca via the 45Sc (t, 3He+γ) reaction at 115 MeV/u and its application to stellar electron-capture rates

NUCLEAR REACTIONS 45Sc(t, 3He), E=115 MeV/nucleon, [triton beam from 9Be(16O, X), E=150 MeV/nucleon reaction]; measured 3He spectra, double-differential σ(θ), Eγ, Iγ, (particle)γ-coin using S800 spectrometer, cathode-readout drift chambers (CRDCs) and Gretina array at NSCL-MSU Coupled-Cyclotron facility. 45Ca; deduced levels, J, π, B(GT) strength functions, electron capture rates on 45Ca as function of stellar temperatures T9=8.5-10.5, poor agreement with shell-model calculations in the pf space and using GXPF1A, KB3G, and FPD6 interactions. Comparison of B(GT) with that from 45Ca g.s. to 45Sc g.s. β transition.

doi: 10.1103/PhysRevC.92.024312
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2015SM03      Phys.Rev. C 92, 064314 (2015)

D.Smalley, H.Iwasaki, P.Navratil, R.Roth, J.Langhammer, V.M.Bader, D.Bazin, J.S.Berryman, C.M.Campbell, J.Dohet-Eraly, P.Fallon, A.Gade, C.Langer, A.Lemasson, C.Loelius, A.O.Macchiavelli, C.Morse, J.Parker, S.Quaglioni, F.Recchia, S.R.Stroberg, D.Weisshaar, K.Whitmore, K.Wimmer

Lifetime measurements of 17C excited states and three-body and continuum effects

NUCLEAR REACTIONS 9Be(18C, 17C), E=74.2 MeV/nucleon, [secondary 18C beam from 9Be(22Ne, X), E=120 MeV/nucleon primary reaction using A1900 fragment separator at NSCL-MSU]; measured one-neutron knockout reaction products, Eγ, Iγ, (particle)γ-coin using GRETINA array for γ rays, and S800 spectrograph for particles, level half-lives using RDM method and a plunger device. 17C; deduced levels, J, π, B(M1). Comparison with importance-truncated no-core shell model (IT-NCSM), and importance-truncated no-core shell model with continuum (IT-NCSMC) calculations.

doi: 10.1103/PhysRevC.92.064314
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2015ST06      Phys.Rev. C 91, 041302 (2015)

S.R.Stroberg, A.Gade, J.A.Tostevin, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, B.A.Brown, C.M.Campbell, K.W.Kemper, C.Langer, E.Lunderberg, A.Lemasson, S.Noji, T.Otsuka, F.Recchia, C.Walz, D.Weisshaar, S.Williams

Neutron single-particle strength in silicon isotopes: Constraining the driving forces of shell evolution

NUCLEAR REACTIONS 9Be(36Si, 35Si), E=100 MeV/nucleon; 9Be(38Si, 37Si), E=95 MeV/nucleon; 9Be(40Si, 39Si), E=85 MeV/nucleon, [secondary 36,38,40Si beams from fragmentation of 48Ca]; measured Eγ, Iγ, γγ-coin using GRETINA array at NSCL-MSU facility; deduced momentum distributions and partial cross sections of the residual nuclei following one-neutron knockout reactions. 35,37,39Si; deduced levels, intruder states, J, π, half-life of a level in 39Si. Comparison with shell-model calculations with SDPF-U and SDPF-MU interactions.

doi: 10.1103/PhysRevC.91.041302
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2015WH02      Phys.Rev. C 91, 041303 (2015)

K.Whitmore, D.Smalley, H.Iwasaki, T.Suzuki, V.M.Bader, D.Bazin, J.S.Berryman, B.A.Brown, C.M.Campbell, P.Fallon, A.Gade, C.Langer, A.Lemasson, C.Loelius, A.O.Macchiavelli, C.Morse, T.Otsuka, J.Parker, F.Recchia, S.R.Stroberg, D.Weisshaar, K.Wimmer

Magnetic response of the halo nucleus 19C studied via lifetime measurement

NUCLEAR REACTIONS 9Be, Ta(20N, 19C), E=74 MeV/nucleon, [secondary 20N beam from 9Be(22Ne, X), E=120 MeV/nucleon primary reaction]; measured reaction products using A1900 separator, Eγ, Iγ, (particle)γ-, γγ-coin, half-life of the first excited state from line-shape and recoil-distance methods using GRETINA array at NSCL-MSU facility. 19C; deduced levels, J, π, B(M1), configuration. One-neutron halo nucleus populated in one-proton knockout reaction. Comparison with shell-model calculations using several different interactions.

doi: 10.1103/PhysRevC.91.041303
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2014GA07      Phys.Rev.Lett. 112, 112503 (2014)

A.Gade, R.V.F.Janssens, D.Weisshaar, B.A.Brown, E.Lunderberg, M.Albers, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, C.M.Campbell, M.P.Carpenter, C.J.Chiara, H.L.Crawford, M.Cromaz, U.Garg, C.R.Hoffman, F.G.Kondev, C.Langer, T.Lauritsen, I.Y.Lee, S.M.Lenzi, J.T.Matta, F.Nowacki, F.Recchia, K.Sieja, S.R.Stroberg, J.A.Tostevin, S.J.Williams, K.Wimmer, S.Zhu

Nuclear Structure Towards N=40 60Ca: In-Beam γ-Ray Spectroscopy of 58, 60Ti

NUCLEAR REACTIONS Be(61V, X)58Ti/60Ti, E=90 MeV/nucleon; measured reaction products, Eγ, Iγ, γ-γ-coin.; deduced energy levels, J, π, partial σ. Comparison with calculations using GXPF1A and LNPS spectroscopic factors, GRETINA at MSU.

doi: 10.1103/PhysRevLett.112.112503
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2014IW01      Phys.Rev.Lett. 112, 142502 (2014)

H.Iwasaki, A.Lemasson, C.Morse, 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

Evolution of Collectivity in 72Kr: Evidence for Rapid Shape Transition

NUCLEAR REACTIONS 9Be(74Kr, 74Kr'), (74Kr, 72Kr'), E<150 MeV/nucleon; measured reaction products, Eγ, Iγ. 72,74Kr; deduced energy levels, B(E2) values. Comparison with theoretical calculations, available data.

doi: 10.1103/PhysRevLett.112.142502
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2014LA16      Phys.Rev.Lett. 113, 032502 (2014)

C.Langer, F.Montes, A.Aprahamian, D.W.Bardayan, D.Bazin, B.A.Brown, J.Browne, H.Crawford, R.H.Cyburt, 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

Determining the rp-Process Flow through 56Ni: Resonances in 57Cu(p, γ)58Zn identified with GRETINA

NUCLEAR REACTIONS 2H(57Cu, n), E=75 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced resonance energies, J, π, reaction rates. Shell model calculations, GXPF1A interaction.

doi: 10.1103/PhysRevLett.113.032502
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2014MO26      Phys.Rev. C 90, 034310 (2014)

C.Morse, H.Iwasaki, A.Lemasson, T.Baugher, D.Bazin, J.S.Berryman, A.Dewald, C.Fransen, A.Gade, S.McDaniel, A.J.Nichols, A.Ratkiewicz, S.R.Stroberg, P.Voss, R.Wadsworth, D.Weisshaar, K.Wimmer, R.Winkler

Lifetime measurements of the yrast 8+ and 9+ states in 70As

NUCLEAR REACTIONS 9Be(78Rb, 70As), E=101.6 MeV/nucleon, [secondary 78Rb beam from 9Be(78Kr, X), E=150 MeV/nucleon primary reaction]; measured Doppler corrected Eγ, Iγ, γγ-, (70As)γ-coin, level half-lives by line-shape analysis using A1900 fragment separator, S-800 spectrometer, and SeGA array at NSCL-MSU facility. 70As; deduced levels, J, π, B(E1), B(M1), configuration. Comparison of B(M1) values for 66Ga, 70As, 74Br, 78Rb and 82Y with predictions of particle-vibration coupling model.

doi: 10.1103/PhysRevC.90.034310
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2014NI09      Phys.Lett. B 733, 52 (2014)

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

Collectivity in A ∼ 70 nuclei studied via lifetime measurements in 70Br and 68, 70Se

NUCLEAR REACTIONS 9Be(71Br, 70Br'), (70Se, 68Se'), (70Se, 70Se'), E < 150 MeV/nucleon; measured reaction products, Eγ, Iγ. 70Br, 68,70Se; deduced energy levels, J, π, B(Eλ). Comparison with shell model calculations using GXPF1 nuclear interaction, available data.

doi: 10.1016/j.physletb.2014.04.016
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2014NO05      Phys.Rev.Lett. 112, 252501 (2014)

S.Noji, R.G.T.Zegers, S.M.Austin, T.Baugher, D.Bazin, B.A.Brown, C.M.Campbell, A.L.Cole, H.J.Doster, A.Gade, C.J.Guess, S.Gupta, G.W.Hitt, C.Langer, S.Lipschutz, E.Lunderberg, R.Meharchand, Z.Meisel, G.Perdikakis, J.Pereira, F.Recchia, H.Schatz, M.Scott, S.R.Stroberg, C.Sullivan, L.Valdez, C.Walz, D.Weisshaar, S.Williams, K.Wimmer

β+ Gamow-Teller Transition Strengths from 46Ti and Stellar Electron-Capture Rates

RADIOACTIVITY 46Ti(β+), (EC) [from 46Ti(t, 3He), E=115 MeV/nucleon]; measured reaction and decay products, Eγ, Iγ; deduced σ(θ, E), Gamow-Teller transition strength, energy levels, J, π, electron capture decay rates. Comparison with shell model calculations using GXPF1A, KB3G, FPD6 interactions, QRPA calculations.

doi: 10.1103/PhysRevLett.112.252501
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2014ST18      Phys.Rev. C 90, 034301 (2014)

S.R.Stroberg, A.Gade, J.A.Tostevin, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, B.A.Brown, C.M.Campbell, K.W.Kemper, C.Langer, E.Lunderberg, A.Lemasson, S.Noji, F.Recchia, C.Walz, D.Weisshaar, S.J.Williams

Single-particle structure of silicon isotopes approaching 42Si

NUCLEAR REACTIONS 9Be(36Si, 35Si), (36Si, 35Al), E=97.7 MeV/nucleon; 9Be(38Si, 37Si), (38Si, 37Al), E=86 MeV/nucleon; 9Be(40Si, 39Si), (40Si, 39Al), E=79 MeV/nucleon, [secondary beams of 36,38,40Si produced in 9Be(48Ca, X), E=140 MeV/nucleon primary reaction]; measured Doppler-shifted γ-ray spectra, Eγ, Iγ, γγ-, (residue)γ-coin, (36Si)γ-coin using GRETINA array for γ detection and ionization chamber and plastic scintillators in the focal plane of S800 spectrograph at NSCL-MSU facility. 35,37,39Al, 35,37,39Si; deduced levels, J, π, parallel momentum distributions, l-values. 36,38,40Si; one-neutron and one-proton total and partial knockout σ, single-particle structure, and enhanced collectivity in the region of 42Si. Eikonal model analysis of parallel momentum distributions. Comparison with large-scale shell model calculations.

NUCLEAR STRUCTURE 35,37,39Al, 35,37,39Si; calculated levels, J, π using large-scale shell model with SDPF-U and SDPF-MU interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.90.034301
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2014WI07      Phys.Rev. C 90, 064615 (2014)

K.Wimmer, D.Bazin, A.Gade, J.A.Tostevin, T.Baugher, Z.Chajecki, D.Coupland, M.A.Famiano, T.K.Ghosh, G.F.Grinyer, M.E.Howard, M.Kilburn, W.G.Lynch, B.Manning, K.Meierbachtol, P.Quarterman, A.Ratkiewicz, A.Sanetullaev, R.H.Showalter, S.R.Stroberg, M.B.Tsang, D.Weisshaar, J.Winkelbauer, R.Winkler, M.Youngs

Elastic breakup cross sections of well-bound nucleons

NUCLEAR REACTIONS 9Be(28Mg, 27Na), E=93 MeV/nucleon, [28Mg secondary beam from 9Be(40ar, X), E=140 MeV/nucleon primary reaction]; measured fragment spectra, (light charged particles)fragment-coin using A1900 fragment separator, S800 magnetic spectrograph and high-resolution array HiRA at NSCL-MSU facility; deduced missing-mass spectra of the one-proton removal reaction residues 7Be, 8B and 27Na, and percentage contributions to proton removal cross section from the elastic and inelastic nucleon removal mechanisms. Comparison of experimental breakup fractions with eikonal reaction model predictions, and previous experimental results.

doi: 10.1103/PhysRevC.90.064615
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2013BA57      Phys.Rev. C 88, 051301 (2013)

V.M.Bader, A.Gade, D.Weisshaar, B.A.Brown, T.Baugher, D.Bazin, J.S.Berryman, A.Ekstrom, M.Hjorth-Jensen, S.R.Stroberg, W.B.Walters, K.Wimmer, R.Winkler

Quadrupole collectivity in neutron-deficient Sn nuclei: 104Sn and the role of proton excitations

NUCLEAR REACTIONS 197Au(104Sn, 104Sn'), (102Cd, 102Cd'), [102Cd, 104Sn secondary beams from 9Be(124Xe, X), E=140 MeV/nucleon primary reaction], E=67 MeV/nucleon for 104Sn and 64 MeV/nucleon for 102Cd; measured scattered particle spectra, Eγ, Iγ, (particle)γ-coin using A1900 fragment separator, Si p-i-n detector and TOF for particles and CAESAR array of scintillation detectors for γ rays at NSCL-MSU facility. 104Sn; deduced level, B(E2) for first 2+ state relative to that for 102Cd. Comparison with previous experimental results, and with large-scale shell model calculations. Enhanced quadrupole collectivity. Systematics of B(E2) values for A=104 to 130 even-A Sn nuclei.

doi: 10.1103/PhysRevC.88.051301
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2013RE18      Phys.Rev. C 88, 041302 (2013)

F.Recchia, C.J.Chiara, R.V.F.Janssens, D.Weisshaar, A.Gade, W.B.Walters, M.Albers, M.Alcorta, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, P.F.Bertone, B.A.Brown, C.M.Campbell, M.P.Carpenter, J.Chen, H.L.Crawford, H.M.David, D.T.Doherty, C.R.Hoffman, 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, S.R.Stroberg, S.Suchyta, S.Williams, K.Wimmer, S.Zhu

Configuration mixing and relative transition rates between low-spin states in 68Ni

NUCLEAR REACTIONS 208Pb(70Zn, X)68Ni, E=440 MeV; measured Eγ, Iγ, (68Ni)γ-, γγ-coin, prompt and delayed γ rays, level half-life using Gammasphere array at ATLAS-ANL facility. 9Be(70Ni, X)68Ni, E=75 MeV/nucleon, [secondary 70Ni beam from 9Be(82Se, X), E=140 MeV/nucleon primary reaction]; measured Eγ, Iγ, γγ-coin, prompt and delayed γ rays, level half-life using S800 spectrograph, GRETINA and CsI(Na) arrays at NSCL-MSU facility. 68Ni; deduced levels, J, π, B(E2) ratios. Comparison with shell-model calculations using jj44pna, jj44b, JUN45, and LNPS effective interactions. Discussed configuration mixing.

doi: 10.1103/PhysRevC.88.041302
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2012DI20      J.Phys.:Conf.Ser. 381, 012119 (2012)

C.A.Diget, T.Baugher, D.Bazin, M.A.Bentley, J S.Berryman, J.R.Brown, K.A.Chipps, P.J.Davies, B.R.Fulton, A.Gade, H.Iwasaki, A.M.Laird, A.Lemasson, S.McDaniel, A.Ratkiewicz, L.Scruton, A.Shore, S.R.Stroberg, D.Weisshaar, K.Wimmer, R.Winkler

Electron capture in core-collapse supernovae investigated through configuration mixing in neutron-rich nuclei

doi: 10.1088/1742-6596/381/1/012119
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2012LE05      Phys.Rev. C 85, 041303 (2012)

A.Lemasson, H.Iwasaki, C.Morse, D.Bazin, T.Baugher, J.S.Berryman, A.Dewald, C.Fransen, A.Gade, S.McDaniel, A.Nichols, A.Ratkiewicz, S.Stroberg, P.Voss, R.Wadsworth, D.Weisshaar, K.Wimmer, R.Winkler

Observation of mutually enhanced collectivity in self-conjugate 7638SR38

NUCLEAR REACTIONS 9Be(76Rb, 76Sr), E=104.5 MeV/nucleon; 9Be (78Rb, 78Sr), E=101.6 MeV/nucleon; measured time-of-flight and energy loss for outgoing particles, Eγ, Iγ, γγ-coin using SeGA array at NSCL, MSU facility, half-lives of first 2+ states by line-shape method. 76,78Rb secondary beams from 9Be(78Kr, X), E=140 MeV/nucleon primary beam. 76,78Sr; deduced levels, J, π, yrast bands, B(E2), deformation parameter. Systematics of energies and B(E2) values for first 2+ states in Z=30-40 and N=34-46 even-even nuclei. Comparison of B(E2) values with predictions from the CHFB+5DCH calculations.

doi: 10.1103/PhysRevC.85.041303
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2012ME05      Phys.Rev.Lett. 108, 122501 (2012)

R.Meharchand, R.G.T.Zegers, B.A.Brown, Sam M.Austin, T.Baugher, D.Bazin, J.Deaven, A.Gade, G.F.Grinyer, C.J.Guess, M.E.Howard, H.Iwasaki, S.McDaniel, K.Meierbachtol, G.Perdikakis, J.Pereira, A.M.Prinke, A.Ratkiewicz, A.Signoracci, S.Stroberg, L.Valdez, P.Voss, K.A.Walsh, D.Weisshaar, and R.Winkler

Probing Configuration Mixing in 12Be with Gamow-Teller Transition Strengths

NUCLEAR REACTIONS Li(12B, 7Be)12Be, E=80 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced σ(θ), B(GT) transition strength, level energies, J, π. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.108.122501
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2012ST12      Phys.Rev. C 86, 024321 (2012)

S.R.Stroberg, A.Gade, T.Baugher, D.Bazin, B.A.Brown, J.M.Cook, T.Glasmacher, G.F.Grinyer, S.McDaniel, A.Ratkiewicz, D.Weisshaar

In-beam γ-ray spectroscopy of 43-46Cl

NUCLEAR REACTIONS 9Be(48K, X)39P/41S/42S/43Cl/44Cl/45Cl/46Cl/46Ar/47Ar, [48K secondary beam from 9Be(48Ca, X), E=140 MeV/nucleon primary reaction], E=85 MeV/nucleon; measured time of flight, energy loss, yields, Eγ, Iγ, γγ-, (particle)γ-coin, level half-life by line shape analysis using SeGA array at NSCL facility. 43,44,45,46Cl; deduced levels, J, π, M1 strength, B(E2). Comparison with shell-model calculations using SDPF-U and EPQQM effective interactions in the sdpf model space. 37,45Cl, 39,47K; calculated M1 matrix elements for four L-forbidden transitions, and compared with experimental values.

doi: 10.1103/PhysRevC.86.024321
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2012WI06      Phys.Rev. C 85, 051603 (2012)

K.Wimmer, D.Bazin, A.Gade, J.A.Tostevin, T.Baugher, Z.Chajecki, D.Coupland, M.A.Famiano, T.K.Ghosh, G.F.Grinyer, R.Hodges, M.E.Howard, M.Kilburn, W.G.Lynch, B.Manning, K.Meierbachtol, P.Quarterman, A.Ratkiewicz, A.Sanetullaev, S.R.Stroberg, M.B.Tsang, D.Weisshaar, J.Winkelbauer, R.Winkler, M.Youngs

Probing elastic and inelastic breakup contributions to intermediate-energy two-proton removal reactions

NUCLEAR REACTIONS 9Be(28Mg, 26Ne), [28Mg secondary beam from 9Be(40Ar, X), E=140 MeV/nucleon primary reaction], E=93 MeV/nucleon; measured particle spectra, energy loss, time of flight, (26Ne)(particle)(particle)-coin, relative cross sections, σ(θ), relative and absolute yields using Coupled Cyclotron facility at NSCL; deduced missing mass spectrum for 26Ne and two proton coincidence events. Importance of stripping, diffraction-stripping, and diffraction two-proton removal mechanisms. Comparison with predictions of reaction model based on eikonal dynamics, and sd-shell structure amplitudes.

doi: 10.1103/PhysRevC.85.051603
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2012WI10      Phys.Rev.Lett. 109, 202505 (2012)

K.Wimmer, D.Bazin, A.Gade, J.A.Tostevin, T.Baugher, Z.Chajecki, D.Coupland, M.A.Famiano, T.K.Ghosh, G.F.Grinyer, R.Hodges, M.E.Howard, M.Kilburn, W.G.Lynch, B.Manning, K.Meierbachtol, P.Quarterman, A.Ratkiewicz, A.Sanetullaev, E.C.Simpson, S.R.Stroberg, M.B.Tsang, D.Weisshaar, J.Winkelbauer, R.Winkler, M.Youngs

Correlations in Intermediate Energy Two-Proton Removal Reactions

NUCLEAR REACTIONS 9Be(28Mg, X)26Ne, E=93 MeV/nucleon; measured reaction products; deduced σ(E), σ(θ, E), Dalitz plots. Comparison with calculations and available data.

doi: 10.1103/PhysRevLett.109.202505
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2011GA18      Phys.Rev. C 83, 054324 (2011)

A.Gade, J.A.Tostevin, T.Baugher, D.Bazin, B.A.Brown, C.M.Campbell, T.Glasmacher, G.F.Grinyer, S.McDaniel, K.Meierbachtol, A.Ratkiewicz, S.R.Stroberg, K.A.Walsh, D.Weisshaar, R.Winkler

Inverse-kinematics one-neutron pickup with fast rare-isotope beams

NUCLEAR REACTIONS 9Be, 12C(22Mg, 23Mg), E=84 MeV/nucleon; measured Eγ, Iγ, particle spectra, γγ-, (particle)γ-coin using SeGA array, momentum distributions, angular distribution. 23Mg; deduced levels, J, π, configuration, cross sections. Single-neutron pickup reactions. CCBA analysis for the reaction mechanism. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.83.054324
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2010AL15      Phys.Rev. C 81, 064316 (2010)

J.M.Allmond, C.W.Beausang, J.O.Rasmussen, T.J.Ross, M.S.Basunia, L.A.Bernstein, D.L.Bleuel, W.Brooks, N.Brown, J.T.Burke, B.K.Darakchieva, K.R.Dudziak, K.E.Evans, P.Fallon, H.B.Jeppesen, J.D.LeBlanc, S.R.Lesher, M.A.McMahan, D.A.Meyer, L.Phair, N.D.Scielzo, S.R.Stroberg, M.Wiedeking

Particle-γ spectroscopy of the (p, d-γ)155Gd reaction: Neutron single-quasiparticle states at N=91

NUCLEAR REACTIONS 156Gd(p, d), E=25 MeV; measured Eγ, Iγ, Ed, Id, dγ-, dγγ-coin, γd(θ), σ. 155Gd; deduced levels, J, π, Nilsson configurations, L transfers, C2jl expansion coefficients, occupancies V2. DWBA analysis of σ(θ) data.

doi: 10.1103/PhysRevC.81.064316
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2010GA06      Phys.Rev. C 81, 051304 (2010)

A.Gade, R.V.F.Janssens, T.Baugher, D.Bazin, B.A.Brown, 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, S.McDaniel, K.Meierbachtol, A.Ratkiewicz, S.R.Stroberg, K.A.Walsh, D.Weisshaar, R.Winkler, S.Zhu

Collectivity at N = 40 in neutron-rich 64Cr

NUCLEAR REACTIONS 9Be(62Fe, 62Fe'), E=73.0 MeV/nucleon [62Fe secondary beam from primary reaction 9Be(76Ge, X), E=130 MeV/nucleon], 9Be(64Fe, 64Fe'), E=67.5 MeV/nucleon [64Fe secondary beam from primary reaction 9Be(76Ge, X), E=130 MeV/nucleon], 9Be(66Fe, 66Fe'), E=82.6 MeV/nucleon [66Fe secondary beam from primary reaction 9Be(76Ge, X), E=130 MeV/nucleon], 9Be(60Cr, 60Cr'), E=80.6 MeV/nucleon [60Cr secondary beam from primary reaction 9Be(76Ge, X), E=130 MeV/nucleon], 9Be(62Cr, 62Cr'), E=74.6 MeV/nucleon [62Cr secondary beam from primary reaction 9Be(76Ge, X), E=130 MeV/nucleon], 9Be(64Cr, 64Cr'), E=87.0 MeV/nucleon [64Cr secondary beam from primary reaction 9Be(76Ge, X), E=130 MeV/nucleon]; measured Eγ, Iγ, (particle)γ-coin, σ. 62,64,66Fe, 60,62,64Cr; deduced levels, J, π. Comparison with large-scale shell-model calculations in different model spaces. 9Be(76Ge, X)62Fe/64Fe/66Fe/60Cr/62Cr/64Cr/65Mn/66Mn/67Fe/69Co, E=130 MeV/nucleon; measured yields of secondary ion beams.

doi: 10.1103/PhysRevC.81.051304
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