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NSR database version of April 11, 2024.

Search: Author = Y.Utsuno

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2024AJ01      Phys.Rev. C 109, 014305 (2024)

S.Ajayi, V.Tripathi, E.Rubino, S.Bhattacharya, L.T.Baby, R.S.Lubna, C.Benetti, C.Wibisono, M.B.Wheeler, S.L.Tabor, Y.Utsuno, N.Shimizu, J.M.Allmond

Observation of collective modes of excitations in 59Co, 59Ni, and 61Co and the influence of the g9/2 orbital

doi: 10.1103/PhysRevC.109.014305
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2024LI18      Phys.Rev. C 109, 034312 (2024)

B.D.Linh, A.Corsi, A.Gillibert, A.Obertelli, P.Doornenbal, C.Barbieri, T.Duguet, M.Gomez-Ramos, J.D.Holt, B.S.Hu, T.Miyagi, A.M.Moro, P.Navratil, K.Ogata, S.Peru, N.T.T.Phuc, N.Shimizu, V.Soma, Y.Utsuno, N.L.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, 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, N.T.Khai, D.Kim, T.Koiwai, Y.Kondo, P.Koseoglou, J.Lee, C.Lehr, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, D.Sohler, P.-A.Soderstrom, S.Takeuchi, H.Tornqvist, V.Vaquero, V.Wagner, S.T.Wang, V.Werner, X.Xu, Y.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

Onset of collectivity for argon isotopes close to N=32

doi: 10.1103/PhysRevC.109.034312
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2024PA05      Phys.Rev. C 109, 014310 (2024)

D.Patel, P.C.Srivastava, N.Shimizu, Y.Utsuno

Systematic shell-model study of 99-129Cd isotopes and isomers in neutron-rich 127-131In isotopes

doi: 10.1103/PhysRevC.109.014310
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2024SH01      Phys.Rev. C 109, 014302 (2024)

T.Shizuma, M.Omer, T.Hayakawa, F.Minato, S.Matsuba, S.Miyamoto, N.Shimizu, Y.Utsuno

Parity assignment for low-lying dipole states in 58Ni

doi: 10.1103/PhysRevC.109.014302
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2024UT01      Phys.Rev. C 109, 014617 (2024)

H.Utsunomiya, S.Goriely, M.Kimura, N.Shimizu, Y.Utsuno, G.M.Tveten, T.Renstrom, T.Ari-izumi, S.Miyamoto

Photoneutron emission cross sections for 13C

doi: 10.1103/PhysRevC.109.014617
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2023BH02      Phys.Rev. C 107, 054311 (2023)

S.Bhattacharya, V.Tripathi, E.Rubino, S.Ajayi, L.T.Baby, C.Benetti, R.S.Lubna, S.L.Tabor, J.Doring, Y.Utsuno, N.Shimizu, J.M.Allmond, G.Mukherjee

Coexistence of single-particle and collective excitation in 61Ni

NUCLEAR REACTIONS 50Ti(14C, 3n)61Ni, E=40 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), γγ(linear polarization) using a Compton-suppressed six clover detectors and three single-crystal HPGe detectors at the Superconducting Accelerator Facility at FSU. 61Ni; deduced high-spin levels, J, π, multipolarities, bands, magnetic rotational (shears) bands. Comparison with semiclassical model (SCM) for shears bands, and shell-model calculations for other bands.

NUCLEAR STRUCTURE 61Ni; calculated high-spin levels, J, π, occupation number for different orbitals, aligned angular momenta of bands using shell model with GXPF1Br+VMU (modified) interaction. Systematics of bands in 59,61,63Ni, 59Fe.

doi: 10.1103/PhysRevC.107.054311
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2023CH26      Phys.Lett. B 843, 138025 (2023)

S.Chen, F.Browne, P.Doornenbal, J.Lee, A.Obertelli, Y.Tsunoda, T.Otsuka, Y.Chazono, G.Hagen, J.D.Holt, G.R.Jansen, K.Ogata, N.Shimizu, Y.Utsuno, K.Yoshida, N.L.Achouri, H.Baba, D.Calvet, F.Chateau, N.Chiga, A.Corsi, M.L.Cortes, 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, W.Rodriguez, 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, C.Lehr, B.D.Linh, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, P.-A.Soderstrom, D.Sohler, S.Takeuchi, H.Tornqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

Level structures of 56, 58Ca cast doubt on a doubly magic 60Ca

NUCLEAR REACTIONS 1H(57Sc, 2p)56Ca, E=209 MeV/nucleon; 1H(59Sc, 2p)58Ca, E=199 MeV/nucleon, [57,59Sc secondary beams from 9Be(70Zn, X), E=345 MeV/nucleon, followed by separation and identification of ions of interest using the BigRIPS separator at RIBF-RIKEN facility]; measured reaction residues of 56Ca and 58Ca through identification by the SAMURAI spectrometer, Doppler-corrected Eγ, Iγ, (particle)γ-coin using the DALI2+ array using MINOS liquid hydrogen target. 56,58Ca; deduced energies of the first 2+ levels. Comparison with shell-model calculations with the GXPF1B Hamiltonian in full pf model space, and the state-of-the-art ab initio approaches: VS-IMSRG method, and CC calculations. Systematics of energies of the first 2+ states and S(2n) from experiment (N=22-36) and theory in N=22-54 Ca isotopes.

doi: 10.1016/j.physletb.2023.138025
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2023KO15      Nature(London) 620, 965 (2023)

Y.Kondo, N.L.Achouri, H.Al Falou, L.Atar, T.Aumann, H.Baba, K.Boretzky, C.Caesar, D.Calvet, H.Chae, N.Chiga, A.Corsi, F.Delaunay, A.Delbart, Q.Deshayes, Zs.Dombradi, C.A.Douma, A.Ekstrom, Z.Elekes, C.Forssen, I.Gasparic, J.-M.Gheller, J.Gibelin, A.Gillibert, G.Hagen, M.N.Harakeh, A.Hirayama, C.R.Hoffman, M.Holl, A.Horvat, A.Horvath, J.W.Hwang, T.Isobe, W.G.Jiang, J.Kahlbow, N.Kalantar-Nayestanaki, S.Kawase, S.Kim, K.Kisamori, T.Kobayashi, D.Korper, S.Koyama, I.Kuti, V.Lapoux, S.Lindberg, F.M.Marques, S.Masuoka, J.Mayer, K.Miki, T.Murakami, M.Najafi, T.Nakamura, K.Nakano, N.Nakatsuka, T.Nilsson, A.Obertelli, K.Ogata, F.de Oliveira Santos, N.A.Orr, H.Otsu, T.Otsuka, T.Ozaki, V.Panin, T.Papenbrock, S.Paschalis, A.Revel, D.Rossi, A.T.Saito, T.Y.Saito, M.Sasano, H.Sato, Y.Satou, H.Scheit, F.Schindler, P.Schrock, M.Shikata, N.Shimizu, Y.Shimizu, H.Simon, D.Sohler, O.Sorlin, L.Stuhl, Z.H.Sun, S.Takeuchi, M.Tanaka, M.Thoennessen, H.Tornqvist, Y.Togano, T.Tomai, J.Tscheuschner, J.Tsubota, N.Tsunoda, T.Uesaka, Y.Utsuno, I.Vernon, H.Wang, Z.Yang, M.Yasuda, K.Yoneda, S.Yoshida

First observation of 28O

NUCLEAR REACTIONS H(29F, X)27O/28O, E=235 MeV/nucleon; measured reaction products; deduced yields. The hydrogen target was surrounded by the MINOS Time Projection Chamber, SAMURAI spectrometer, RIKEN RI Beam Factory.

RADIOACTIVITY 28O(4n), 27O(3n); measured decay products, En, In; deduced decay energy spectra and schemes from the measured momenta using the invariant-mass technique, resonance parameters. Comparison with the large-scale shell-model calculations using the new chiral effective field theory (EEdf3) interaction.

doi: 10.1038/s41586-023-06352-6
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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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2023RE02      Phys.Lett. B 838, 137704 (2023)

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

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

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

doi: 10.1016/j.physletb.2023.137704
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2022ID01      Phys.Rev.Lett. 128, 252501 (2022)

E.Ideguchi, T.Kibedi, J.T.H.Dowie, T.H.Hoang, M.Kumar Raju, N.Aoi, A.J.Mitchell, A.E.Stuchbery, N.Shimizu, Y.Utsuno, A.Akber, L.J.Bignell, B.J.Coombes, T.K.Eriksen, T.J.Gray, G.J.Lane, B.P.McCormick

Electric Monopole Transition from the Superdeformed Band in 40Ca

NUCLEAR REACTIONS 40Ca(p, p'), E<10 MeV; measured reaction products, Eγ, Iγ, X-rays; deduced γ-ray energies, energy levels, partial level scheme, electric monopole (E0) transition strengths, transition rates for 0+ states. Comparison with Large-scale shell-model (LSSM) calculations and systematics. The 14UD Pelletron tandem accelerator of the Heavy Ion Accelerator Facility at the Australian National University.

doi: 10.1103/PhysRevLett.128.252501
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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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2022KO06      Phys.Lett. B 827, 136953 (2022)

T.Koiwai, K.Wimmer, P.Doornenbal, A.Obertelli, C.Barbieri, T.Duguet, J.D.Holt, T.Miyagi, P.Navratil, K.Ogata, N.Shimizu, V.Soma, Y.Utsuno, K.Yoshida, N.L.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, M.L.Cortes, 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, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, 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, 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, P.-A.Soderstrom, D.Sohler, S.Takeuchi, H.Toernqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

A first glimpse at the shell structure beyond 54Ca: Spectroscopy of 55K, 55Ca, and 57Ca

NUCLEAR REACTIONS 1H(56Ca, 2p)55K, (56Ca, np)55Ca, E=250 MeV/nucleon; 1H(58Sc, 2p)57Ca, E not given, [secondary 56Ca and 58Sc beams from 9Be(70Zn, X), E=345 MeV/nucleon, followed by selection of fragments of interest using the BigRIPS separator through the TOF-ΔE-Bρ method at RIBF-RIKEN facility]; measured reaction products using the by SAMURAI magnetic spectrometer, protons, Eγ, Iγ, (proton)γ-coin using thick liquid hydrogen target system MINOS and DALI22 array of 226 NaI(Tl) scintillator detectors. 55K, 55,57Ca; deduced levels, J, π, level half-lives, exclusive population σ, spectroscopic factors, short-lived state in 57Ca. Comparison with state-of-the-art theoretical calculations using different approaches such as large-scale shell model (LSSM), valence-space in-medium similarity renormalization group (VS-IMSRG), full-space self-consistent Green's function (SCGF) with NNLOsat and NN+3N(lnl) interactions.

doi: 10.1016/j.physletb.2022.136953
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2022TR03      Phys.Rev. C 106, 064314 (2022)

V.Tripathi, S.Bhattacharya, E.Rubino, C.Benetti, J.F.Perello, S.L.Tabor, S.N.Liddick, P.C.Bender, M.P.Carpenter, J.J.Carroll, A.Chester, C.J.Chiara, K.Childers, B.R.Clark, B.P.Crider, J.T.Harke, B.Longfellow, R.S.Lubna, S.Luitel, T.H.Ogunbeku, A.L.Richard, S.Saha, N.Shimizu, O.A.Shehu, Y.Utsuno, R.Unz, Y.Xiao, S.Yoshida, Y.Zhu

β- decay of exotic P and S isotopes with neutron number near 28

RADIOACTIVITY 42,43,44P, 44,46S(β-), (β-n) [from Be(48Ca, X), E=140 MeV/nucleon)]; 41S(β-) [from 42P(β-n]; measured Iβ, Eγ, Iγ, βγ-coin, (implant)γ-coin; deduced T1/2, logft, delayed neutron emission probabilities. 42P; deduced J, π of the ground state. 42,41S, 41Cl; deduced levels, J, π, transition intensities. The half-lives were extracted from the fitting of decay curves. Comparison to calculations performed with shell-model using SDPFSDG-MU interaction. Beta Counting System (BCS) - 40x40 DSSD as the implant and β detector, surrounded by a γ-array of 16 Clover detectors in close geometry (NSCL).

doi: 10.1103/PhysRevC.106.064314
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2021AB10      Phys.Rev. C 104, 054315 (2021)

T.Abe, P.Maris, T.Otsuka, N.Shimizu, Y.Utsuno, J.P.Vary

Ground-state properties of light 4n self-conjugate nuclei in ab initio no-core Monte Carlo shell model calculations with nonlocal NN interactions

NUCLEAR STRUCTURE 4He, 8Be, 12C, 16O, 20Ne; calculated ground-state energies and point-proton rms radii using ab initio no-core Monte Carlo shell model (MCSM), with the JISP16 and Daejeon16 nonlocal nucleon-nucleon interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.104.054315
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2021AS06      Phys.Rev. C 103, L051302 (2021)

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

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

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

doi: 10.1103/PhysRevC.103.L051302
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2021BH12      Phys.Rev. C 104, 045801 (2021)

A.Bhattacharyya, U.Datta, A.Rahaman, S.Chakraborty, T.Aumann, S.Beceiro Novo, K.Boretzky, C.Caesar, B.V.Carlson, W.N.Catford, M.Chartier, D.Cortina-Gil, P.Das, G.D.Angelis, P.Diaz Fernandez, H.Emling, H.Geissel, D.Gonzalez-Diaz, M.Heine, H.Johansson, B.Jonson, N.Kalantar-Nayestanaki, T.Kroll, R.Krucken, J.Kurcewicz, C.Langer, T.Le Bleis, Y.Leifels, J.Marganiec, G.Munzenberg, T.Nilsson, C.Nociforo, V.Panin, S.Paschalis, R.Plag, R.Reifarth, M.V.Ricciardi, C.Rigollet, D.Rossi, C.Scheidenberger, H.Scheit, H.Simon, Y.Togano, S.Typel, Y.Utsuno, A.Wagner, F.Wamers, H.Weick, J.S.Winfield

Neutron capture cross sections of light neutron-rich nuclei relevant for r-process nucleosynthesis

NUCLEAR REACTIONS 208Pb, 12C(29Na, X), (30Na, X), (33Mg, X), (35Al, X), E=410-430 MeV/nucleon, [secondary 29,30Na, 33Mg, 35Al beams from fragmentation of 540 MeV/nucleon 40Ar beam, followed by separation of ions of interest using the FRS-ALADIN-LAND apparatus at GSI]; measured reaction products, Eγ, Iγ, invariant mass spectra in coincidence with the sum energy of γ rays in different energy ranges using an array of 162 NaI(Tl) detectors for γ rays emitted from the excited core of the projectiles after Coulomb dissociation; deduced number of E1 type virtual photons from Coulomb, invariant mass spectra of breakup of incident beams into 28Na, 29Na, 32Mg and 34Al and one neutron in each case, and analyzed using direct breakup model. 29Na, 30Na, 33Mg, (γ, n), E*=2-16 MeV; 35Al(γ, n), E*=5-20 MeV, virtual photons from Coulomb breakup of incident beams; deduced photoabsorption σ(E) as function of excitation energy. 28,29Na, 32Mg, 34Al(n, γ), E<13 MeV; deduced neutron capture σ(E) using the photoabsorption cross sections. 28,29Na, 32Mg, 34Al(n, γ), T9=0.01-100; deduced astrophysical total reaction rates at the onset and at the end of the r-process. 14C(n, γ), E(cm)=10-1000 keV; analyzed previous experimental cross section data, and compared with theoretical calculations. 29,30Na, 33Mg, 35Al; deduced spectroscopic factors for the occupied orbitals of valence neutron(s) in the ground states from Coulomb breakup cross sections, and compiled previous experimental spectroscopic factors. Relevance to neutrino-driven wind model of core-collapse supernovae, and r-process nucleosynthesis.

doi: 10.1103/PhysRevC.104.045801
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2021BR11      Phys.Rev.Lett. 126, 252501 (2021)

F.Browne, S.Chen, P.Doornenbal, A.Obertelli, K.Ogata, Y.Utsuno, K.Yoshida, N.L.Achouri, H.Baba, D.Calvet, F.Chateau, N.Chiga, A.Corsi, M.L.Cortes, 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, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, O.Aktas, T.Aumann, K.Boretzky, C.Caesar, L.X.Chung, F.Flavigny, S.Franchoo, I.Gasparic, R.-B.Gerst, J.Gibelin, K.I.Hahn, M.Holl, J.Kahlbow, D.Kim, D.Korper, T.Koiwai, Y.Kondo, P.Koseoglou, J.Lee, C.Lehr, B.D.Linh, T.Lokotko, M.MacCormick, K.Miki, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, F.Schindler, H.Simon, P.-A.Soderstrom, D.Sohler, S.Takeuchi, H.Tornqvist, J.Tscheuschner, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

Pairing Forces Govern Population of Doubly Magic 54Ca from Direct Reactions

NUCLEAR REACTIONS 1H(55Sc, 2p), E<345 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, partial σ. Comparison with distorted-wave impulse approximation estimates multiplied by the shell model spectroscopic factors. RIKEN RadioactiveIsotope Beam Factory.

doi: 10.1103/PhysRevLett.126.252501
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2021GO09      Phys.Rev. C 103, 034327 (2021)

S.Go, E.Ideguchi, R.Yokoyama, N.Aoi, F.Azaiez, K.Furutaka, Y.Hatsukawa, A.Kimura, K.Kisamori, M.Kobayashi, F.Kitatani, M.Koizumi, H.Harada, I.Matea, S.Michimasa, H.Miya, S.Nakamura, M.Niikura, H.Nishibata, N.Shimizu, S.Shimoura, T.Shizuma, M.Sugawara, D.Suzuki, M.Takaki, Y.Toh, Y.Utsuno, D.Verney, A.Yagi

High-spin states in 35S

NUCLEAR REACTIONS 26Mg(18O, n2α)35S, E=80 MeV; measured Eγ, Iγ, γγ-coin, (particle)γγ-coin, γγ(θ)(ADO) using GEMINI-II array with the BGO Compton suppressors at JAEA tandem accelerator facility, and ORGAM array with BGO anti-Compton suppressors at ALTO-Tandem facility. 35S; deduced high-spin levels, J, π, multipolarities; calculated levels, J, π, B(M1), B(E2) using large-scale shell-model calculations with SDPF-MSD4 interaction, and compared with experimental data.

doi: 10.1103/PhysRevC.103.034327
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2021JU02      Phys.Lett. B 814, 136108 (2021)

M.M.Juhasz, Z.Elekes, D.Sohler, Y.Utsuno, K.Yoshida, T.Otsuka, K.Ogata, P.Doornenbal, A.Obertelli, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, N.L.Achouri, O.Aktas, T.Aumann, L.X.Chung, Zs.Dombradi, 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, H.N.Liu, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, P.-A.Soderstrom, S.Takeuchi, H.Tornqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

First spectroscopic study of 51Ar by the (p, 2p) reaction

NUCLEAR REACTIONS 1H(51Ar, 2p), (52K, 2p), E ∼ 260 MeV/nucleon; measured reaction products, Eγ, Iγ. 51Ar, 52K; deduced γ-ray energies and intensities, resonance parameters, σ, spectroscopic factors, partial level schemes, J, π. Comparison with shell model calculations, the Radioactive Isotope Beam Factory operated by the RIKEN Nishina Center and the Center for Nuclear Study of the University of Tokyo.

doi: 10.1016/j.physletb.2021.136108
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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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2021KL03      Phys.Rev. C 104, 034310 (2021)

H.Kleis, M.Seidlitz, A.Blazhev, L.Kaya, P.Reiter, K.Arnswald, A.Dewald, M.Droste, C.Fransen, O.Moller, N.Shimizu, Y.Tsunoda, Y.Utsuno, P.von Brentano, K.O.Zell

Lifetime measurements of excited states in 55Cr

NUCLEAR REACTIONS 48Ca(11B, 3np)55Cr, E=32 MeV; measured Eγ, Iγ, level T1/2 by recoil-distance Doppler shift (RDDS) method using Cologne plunger device surrounded by a cluster of seven HPGe crystals and five single HPGe detectors. 55Cr; deduced levels, J, π, B(M1), B(E2). Comparison with shell-model calculations, with previous results for level half-lives, and systematics of N=31 isotones.

NUCLEAR STRUCTURE 53Ti, 55Cr, 57Fe, 59Ni, 61Zn; calculated levels, J, π, B(M1), B(E2), dominant neutron configurations for N=31 isotones using shell model, KB3G, FPD6, GXPF1A, and GXPF1Br interactions, and KSHELL, NUSHELLX@MSU computer codes. Comparison with experimental values.

doi: 10.1103/PhysRevC.104.034310
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2021LI58      Phys.Rev. C 104, 044331 (2021)

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

Investigation of the ground-state spin inversion in the neutron-rich 47, 49Cl isotopes

NUCLEAR REACTIONS 1H(50Ar, 2p)49Cl, (50Ar, 2n2p)47Cl; 1H(52K, n3p)49Cl; 1H(48Cl, np)47Cl, [secondary ion beams from 9Be(70Zn, X), E=345 MeV/nucleon primary reaction at RIBF-RIKEN facility, followed by separation of ions by BigRIPS separator using Bπ-ΔE-TOF measurement and MINOS hydrogen target system]; measured reaction products, A/Q versus Z plot, scattered ions of 47Cl and 49Cl using the SAMURAI spectrometer and identified by A/Q and Z, Eγ, Iγ, γγ-coin using DALI2+ array of 226 NaI(Tl) detectors. 47,49Cl; deduced levels, J and π for 49Cl, parallel and transverse momentum distributions and L-transfers for 49Cl, inclusive cross sections. Comparison of experimental level structure with shell-model calculations using SDPF-MU interactions, and IMSRG calculation. Comparison of momentum distributions with distorted-wave impulse approximation (DWIA), and transfer to continuum (TC) methods. Comparison of inclusive cross sections with LISE++ theoretical calculations. 49Cl; calculated levels, J, π, T1/2 of levels, B(E2), B(M1) using SDFP-MU shell-model. 45,47,49Cl; calculated levels, J, π, spectroscopic factors using shell-model and ab initio approaches. 41,43,45,47Cl; spin inversion issue not settled. Comparison of experimental and theoretical (from CGF) energy difference between the first 1/2+ and 3/2+ states in 35,36,37,38,39,40,41,43,45,47,49,51,53Cl, 37,38,39,40,41,43,45,47,49,51,53,55K.

doi: 10.1103/PhysRevC.104.044331
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2021SH01      Phys.Rev. C 103, 014312 (2021)

N.Shimizu, Y.Tsunoda, Y.Utsuno, T.Otsuka

Variational approach with the superposition of the symmetry-restored quasiparticle vacua for nuclear shell-model calculations

NUCLEAR STRUCTURE 132Ba, 150Nd, 150Sm; calculated energies, quadrupole moments, B(E2), variance-energy plot of low-spin positive-parity levels using variational calculation in quasiparticle vacua shell model (QVSM), utilizing the superposition of the angular-momentum, parity, number projected quasiparticle vacua.

RADIOACTIVITY 76Ge, 150Nd(2β-); calculated 0νββ-decay GT-type, Fermi-type, and tensor-type nuclear matrix elements (NME) by Monte Carlo Shell-model (MCSM), and quasiparticle vacua shell model (QVSM).

doi: 10.1103/PhysRevC.103.014312
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2021SH17      Prog.Theor.Exp.Phys. 2021, 033D01 (2021)

N.Shimizu, T.Togashi, Y.Utsuno

Gamow-Teller transitions of neutron-rich N = 82, 81 nuclei by shell-model calculations

NUCLEAR STRUCTURE 132Sn, 130Cd, 128Pd, 130In, 133Sb, 131In, 129Ag, 127Rh, 126Ru, 125Tc, 124Mo; calculated energy levels, J, π, neutron separation energies, Gamow-Teller transitions. Large-scale shell-model calculations.

doi: 10.1093/ptep/ptab022
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2020CO12      Phys.Rev. C 102, 064320 (2020)

M.L.Cortes, W.Rodriguez, P.Doornenbal, A.Obertelli, J.D.Holt, J.Menendez, K.Ogata, A.Schwenk, N.Shimizu, J.Simonis, Y.Utsuno, 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, P.-A.Soderstrom, D.Sohler, S.Takeuchi, H.Toernqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

N = 32 shell closure below calcium: Low-lying structure of 50Ar

NUCLEAR REACTIONS 1H(52Ca, 3p), E=266 MeV; 1H(53Ca, n3p), E=258 MeV; 1H(54Ca, 2n3p), E=251 MeV; 1H(55Ca, 3n3p), E=247 MeV; 1H(51K, 2p), E=257 MeV; 1H(52K, n2p), E=250 MeV; 1H(53K, 2n2p), E=245 MeV; 1H(51Ar, np), E=241 MeV; 1H(50Ar, p'), [secondary 52,53,54,55Ca, 51,52,53K, 50,51Ar beams from 9Be(70Zn, X), E=345 MeV/nucleon primary beam, followed by separation of fragments using BigRIPS separator at RIBF-RIKEN facility]; measured reaction products, yields, inclusive σ, Eγ, Iγ, γγ-coin using the MINOS hydrogen target, time projection chamber, SAMURAI dipole magnet, and DALI2+ array of 226 NaI(Tl) detectors. 50Ar; deduced Doppler corrected γ-ray spectra, levels, J, π; calculated levels, J, π, spectroscopic factors and cross sections for levels using the SDPF-MU shell model, and ab initio VS-IMSRG approach.

doi: 10.1103/PhysRevC.102.064320
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2020FU02      Eur.Phys.J. A 56, 138 (2020)

Y.Fujita, Y.Utsuno, H.Fujita

Low-energy super Gamow-Teller (LeSGT) and anti-LeSGT transitions

doi: 10.1140/epja/s10050-020-00133-9
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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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2020LA06      Phys.Rev. C 101, 034315 (2020)

Md.S.R.Laskar, R.Palit, S.N.Mishra, N.Shimizu, Y.Utsuno, E.Ideguchi, U.Garg, S.Biswas, F.S.Babra, R.Gala, C.S.Palshetkar, Z.Naik

Structure of the 11/2- isomeric state in 133La

NUCLEAR REACTIONS 126Te(11B, 4n)133La, E=52 MeV; measured Eγ, Iγ, spin precession, g factor of the 11/2- isomeric state in 133La by time differential perturbed angular distribution (TDPAD) technique, and its half-life by γ(t) at the Pelletron Linac Facility of BARC-TIFR. 133La; deduced levels, J, π, spectroscopic quadrupole moment, β2. Analysis of spin rotation data by magnetic dipole and electric quadrupole hyperfine interactions. Comparison with large scale shell model calculations.

doi: 10.1103/PhysRevC.101.034315
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2020OT02      Rev.Mod.Phys. 92, 015002 (2020)

T.Otsuka, A.Gade, O.Sorlin, T.Suzuki, Y.Utsuno

Evolution of shell structure in exotic nuclei

NUCLEAR STRUCTURE Z=8-126; analyzed available data; deduced changes in magic numbers for hort-lived, so-called exotic nuclei or rare isotopes, characterized by a large N=Z asymmetry and located far from the valley of β stability on the nuclear chart.

doi: 10.1103/RevModPhys.92.015002
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2020SU06      Phys.Lett. B 802, 135215 (2020)

Y.L.Sun, A.Obertelli, P.Doornenbal, C.Barbieri, Y.Chazono, T.Duguet, H.N.Liu, P.Navratil, F.Nowacki, K.Ogata, T.Otsuka, F.Raimondi, V.Soma, Y.Utsuno, K.Yoshida, N.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, 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.Tornqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

Restoration of the natural E(1/2+1)-E(3/2+1) energy splitting in odd-K isotopes towards N = 40

NUCLEAR REACTIONS 52,54Ca(p, 2p)51K/53K, E ∼ 250 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, partial σ. Comparison with ab initio and shell-model calculations with improved phenomenological effective interactions.

doi: 10.1016/j.physletb.2020.135215
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2020TS03      Nature(London) 587, 66 (2020)

N.Tsunoda, T.Otsuka, K.Takayanagi, N.Shimizu, T.Suzuki, Y.Utsuno, S.Yoshida, H.Ueno

The impact of nuclear shape on the emergence of the neutron dripline

NUCLEAR STRUCTURE 22,24,26,28,30,32,34,36Ne, 24,26,28,30,32,34,36,38,40,42Mg, 23,25,27,29,31,33,35,37Na, 19,21,23,25,27,29F; analyzed available data; calculated 2+ and 4+ energies using configuration interaction, ground-state energies, dripline, magic numbers, J, π and energy levels using nucleon-nucleon interactions, nuclear shapes. Comparison with ENSDF library, available data; deduced mechanism for the formation of the neutron dripline.

doi: 10.1038/s41586-020-2848-x
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2019AB06      Phys.Rev. C 100, 014323 (2019)

B.Abromeit, V.Tripathi, H.L.Crawford, S.N.Liddick, S.Yoshida, Y.Utsuno, P.C.Bender, B.P.Crider, R.Dungan, P.Fallon, K.Kravvaris, N.Larson, R.S.Lubna, T.Otsuka, C.J.Prokop, A.L.Richard, N.Shimizu, S.L.Tabor, A.Volya

Β- decay of Tz = +11/2 isotopes 37Al and 39Si: Understanding Gamow-Teller strength distribution in neutron-rich nuclei

RADIOACTIVITY 37Al, 37,39,40Si, 37,39P(β-)[from 9Be(48Ca, X), E=140 MeV/nucleon, followed by fragment separation using A1900 separator at NSCL-MSU]; 37Al, 39Si(β-n); measured β, Eγ, Iγ, βγ-coin, half-lives of decays of 37Al, 37Si and 39Si, %β-n for decays of 37Al and 39Si using β-counting system (BCS) at NSCL-MSU which consisted of silicon PIN detectors, segmented planar Ge double-sided strip detector (GeDSSD) for implants and β- detection, and an array of 16 segmented Ge detectors for γ rays. 36Si, 37Si, 37,39,40P, 37,39S; deduced levels, J, π, β feedings, logft, %β-n. Systematics of low-lying positive π states in 35,37,39P, and T1/2 in N=20-28 Si isotopes. Comparison with shell model calculations.

NUCLEAR STRUCTURE 35,37,39P, 37,39S, 37Si; calculated levels, J, π, logft values. Shell model calculations using the SDPFSDG-MU interaction. Comparison with experimental data from the present experiment, and the evaluated data in the ENSDF database at NNDC.

doi: 10.1103/PhysRevC.100.014323
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2019CH43      Phys.Rev.Lett. 123, 142501 (2019)

S.Chen, J.Lee, P.Doornenbal, A.Obertelli, C.Barbieri, Y.Chazono, P.Navratil, K.Ogata, T.Otsuka, F.Raimondi, V.Soma, Y.Utsuno, K.Yoshida, H.Baba, F.Browne, D.Calvet, F.Chateau, N.Chiga, A.Corsi, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, J.Kahlbow, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, N.Achouri, 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, 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.Tornqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

Quasifree Neutron Knockout from 54Ca Corroborates Arising N=34 Neutron Magic Number

NUCLEAR REACTIONS 1H(54Ca, X)53Ca, E=216 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, exclusive σ, inclusive parallel momentum distributions. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.123.142501
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2019FU06      Phys.Rev. C 100, 034618 (2019)

H.Fujita, Y.Fujita, Y.Utsuno, K.Yoshida, T.Adachi, A.Algora, M.Csatlos, J.M.Deaven, E.Estevez Aguado, C.J.Guess, J.Gulyas, K.Hatanaka, K.Hirota, R.Hutton, D.Ishikawa, A.Krasznahorkay, H.Matsubara, F.Molina, H.Okamura, H.J.Ong, G.Perdikakis, B.Rubio, C.Scholl, Y.Shimbara, G.Susoy, T.Suzuki, A.Tamii, J.H.Thies, R.G.T.Zegers, J.Zenihiro

Experimental study of Gamow-Teller transitions via the high-energy-resolution 18O(3He, t)18F reaction: Identification of the low-energy "super"-Gamow-Teller state

NUCLEAR REACTIONS 18O(3He, t)18F, E=140 MeV/nucleon; measured E(t), I(t), angular distribution of tritons using Grand Raiden magnetic spectrometer at RCNP facility. 18F; deduced levels, J, π, L-transfers, widths, B(GT) Gamow-Teller strengths, low-energy super Gamow-Teller (LeSGT) state. DWBA analysis. Comparison with previous experimental and evaluated data, and with shell-model calculations using USDA, USDB and modified-PSDWBT interactions, and quasiparticle-random-phase approximation (QRPA) calculations.

doi: 10.1103/PhysRevC.100.034618
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2019KA36      Phys.Rev. C 100, 024323 (2019)

L.Kaya, A.Vogt, P.Reiter, M.Siciliano, N.Shimizu, Y.Utsuno, H.-K.Wang, A.Gargano, L.Coraggio, N.Itaco, K.Arnswald, D.Bazzacco, B.Birkenbach, A.Blazhev, A.Bracco, B.Bruyneel, L.Corradi, F.C.L.Crespi, G.de Angelis, M.Droste, J.Eberth, A.Esmaylzadeh, E.Farnea, E.Fioretto, C.Fransen, A.Gadea, A.Giaz, A.Gorgen, A.Gottardo, K.Hadynska-Klek, H.Hess, R.Hirsch, P.R.John, J.Jolie, A.Jungclaus, V.Karayonchev, L.Kornwebel, W.Korten, S.Leoni, L.Lewandowski, S.Lunardi, R.Menegazzo, D.Mengoni, C.Michelagnoli, T.Mijatovic, G.Montagnoli, D.Montanari, C.Muller-Gatermann, D.Napoli, Zs.Podolyak, G.Pollarolo, F.Recchia, J.-M.Regis, N.Saed-Samii, E.Sahin, F.Scarlassara, K.Schomacker, M.Seidlitz, B.Siebeck, P.-A.Soderstrom, A.M.Stefanini, O.Stezowski, S.Szilner, B.Szpak, E.Teruya, C.Ur, J.J.Valiente-Dobon, K.Wolf, K.Yanase, N.Yoshinaga, K.O.Zell

Isomer spectroscopy in 133Ba and high-spin structure of 134Ba

NUCLEAR REACTIONS 124Sn(13C, X)133Ba/134Ba, E=55 MeV from FN tandem accelerator at Cologne; 208Pb(136Xe, X)134Ba, E=6.84 MeV/nucleon from PIAVE+ALPI accelerator complex at LNL-Legnaro; measured Eγ, Iγ, γγ-coin, γγ(θ), half-lives of isomers by γγ(t) using eight HPGe and 12 LaBr3(ce) detectors at Cologne, and magnetic spectrometer PRISMA with AGATA array at Legnaro. 133,134Ba; deduced high-spin levels, isomers, J, π, multipolarities, alignments, bands, backbending, configurations, B(E1), B(E2). Comparison with shell-model calculations for 134Ba, and with previous experimental results. Systematics of positive- and negative-parity yrast states in N=78 nuclei: 130Te, 132Xe, 134Ba, 136Ce, 138Nd, 140Sm, 142Gd, and Z=56 nuclei: 126,128,130,132,134,136,138Ba.

NUCLEAR STRUCTURE 134Ba; calculated levels, J, π using GCN50:82, SN100PN, SNV, PQM130, and realistic SM interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.100.024323
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2019LA01      Phys.Rev. C 99, 014308 (2019)

Md.S.R.Laskar, S.Saha, R.Palit, S.N.Mishra, N.Shimizu, Y.Utsuno, E.Ideguchi, Z.Naik, F.S.Babra, S.Biswas, S.Kumar, S.K.Mohanta, C.S.Palshetkar, P.Singh, P.C.Srivastava

g-factor measurement of the 2738 keV isomer in 135La

NUCLEAR REACTIONS 128Te(11B, 4n), E=52 MeV; measured delayed γ spectra, g factor by hyperfine interactions using TDPAD technique, half-life of the 23/2+ nanosecond isomer at the heavy-ion accelerator facility of TIFR, Mumbai. 135La; deduced level, configuration. Comparison with large-scale shell model calculations with SNV interaction.

NUCLEAR MOMENTS 135La; measured g factor of the 2738-keV, 23/2+ isomer by hyperfine interactions using TDPAD technique, using 128Te(11B, 4n) reaction. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.99.014308
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2019MU03      Phys.Rev. C 99, 011302 (2019)

I.Murray, M.MacCormick, D.Bazin, P.Doornenbal, N.Aoi, H.Baba, H.Crawford, P.Fallon, K.Li, J.Lee, M.Matsushita, T.Motobayashi, T.Otsuka, H.Sakurai, H.Scheit, D.Steppenbeck, S.Takeuchi, J.A.Tostevin, N.Tsunoda, Y.Utsuno, H.Wang, K.Yoneda

Spectroscopy of strongly deformed 32Ne by proton knockout reactions

NUCLEAR REACTIONS 9Be(33Na, 32Ne), (34Mg, 32Ne), E=235, 221 MeV/nucleon; measured reaction products, Eγ, Iγ, γγ-coin, time of flight and energy loss, σ for one- and two-proton knockout reactions populating levels in 32Ne using the ZeroDegree spectrometer for particle identification and the DALI2 array for γ detection at the RIKEN-RIBF facility. 32Ne; deduced first 2+ and 4+ levels, configuration, E(first 4+)/E(first 2+) ratio. Systematics of energies of the first 2+ and 4+ levels in 26,28,30,32,34,36Ne, 28,30,32,34,36,38Mg, 30,32,34,36,38,40Si. Systematics of cross sections of two-proton knockout reactions for residues of 26,28,30,32Ne. Comparison of experimental inclusive and exclusive reaction cross sections with shell-model and eikonal reaction dynamical calculations.

doi: 10.1103/PhysRevC.99.011302
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2019SH26      Phys.Rev. C 100, 014307 (2019)

T.Shizuma, M.Omer, R.Hajima, N.Shimizu, Y.Utsuno

Spin and parity determination of the 3.004-MeV level in 27Al: Its low-lying multiplet structure

NUCLEAR REACTIONS 27Al(polarized γ, γ'), E=2900-3100 quasimonochromatic, linearly polarized photon beam from the TUNL High Intensity γ-ray Source (HIγS); measured Eγ, Iγ, azimuthal asymmetry and γ-ray angular distributions. 27Al; deduced levels, J and π of 2.982- and 3.004-MeV levels, multipolarity and mixing ratio of γ transition, Γ0, integrated cross section, and B(E2) for 3.004-MeV level. Comparisons with Monte-Carlo shell model calculations, and with previous measurements.

doi: 10.1103/PhysRevC.100.014307
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2018OR03      Phys.Lett. B 785, 615 (2018)

R.Orlandi, S.D.Pain, S.Ahn, A.Jungclaus, K.T.Schmitt, D.W.Bardayan, W.N.Catford, R.Chapman, K.A.Chipps, J.A.Cizewski, C.G.Gross, M.E.Howard, K.L.Jones, R.L.Kozub, B.Manning, M.Matos, K.Nishio, P.D.O'Malley, W.A.Peters, S.T.Pittman, A.Ratkiewicz, C.Shand, J.F.Smith, M.S.Smith, T.Fukui, J.A.Tostevin, Y.Utsuno

Neutron-hole states in 131Sn and spin-orbit splitting in neutron-rich nuclei

NUCLEAR STRUCTURE 131,132,133Sn; analyzed available data; deduced spectroscopic factors, a significant reduction of the energy splitting of the weakly bound 3p orbits compared to the well-bound 2d orbits; calculated energy splitting using a one-body spin-orbit interaction and a Woods–Saxon potential of standard radius and diffuseness.

NUCLEAR REACTIONS 2H(132Sn, t)131Sn, E ∼ 4.4 MeV/nucleon; measured reaction products; deduced σ(θ), orbital angular momentum, energy levels, J, π.

doi: 10.1016/j.physletb.2018.08.005
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2018XU05      Phys.Lett. B 782, 619 (2018)

Z.Y.Xu, H.Heylen, K.Asahi, F.Boulay, J.M.Daugas, R.P.de Groote, W.Gins, O.Kamalou, A.Koszorus, M.Lykiardopoulou, T.J.Mertzimekis, G.Neyens, H.Nishibata, T.Otsuka, R.Orset, A.Poves, T.Sato, C.Stodel, J.C.Thomas, N.Tsunoda, Y.Utsuno, M.Vandebrouck, X.F.Yang

Nuclear moments of the low-lying isomeric 1+ state of 34Al: Investigation on the neutron 1p1h excitation across N=20 in the island of inversion

NUCLEAR MOMENTS 32,34Al; measured transition frequencies using β-NMR/NQR techniques; deduced nuclear g factor and quadrupole moments. Comparison with large-scale shell-model calculations using several effective interactions.

doi: 10.1016/j.physletb.2018.06.009
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2018YO06      Phys.Rev. C 97, 054321 (2018); Erratum Phys.Rev. C 109, 029904 (2024)

S.Yoshida, Y.Utsuno, N.Shimizu, T.Otsuka

Systematic shell-model study of β-decay properties and Gamow-Teller strength distributions in A ≈ 40 neutron-rich nuclei

RADIOACTIVITY 39,40S, 40P, 41Cl(β-); calculated logft values and compared with experimental data. 35,36,37,38,39,40,41,42,43,44,45,46,47Al, 36,37,38,39,40,41,42,43,44,45,46,47,48Si, 37,38,39,40,41,42,43,44,45,46,47,48,49P, 38,39,40,41,42,43,44,45,46,47,48,49,50S, 39,40,41,42,43,44,45,46,47,48,49,50,51Cl, 40,41,42,43,44,45,46,47,48,49,50,51,52Ar(β-)(β-n); calculated β-decay T1/2, β-delayed neutron emission probabilities (Pn), Gamow-Teller (GT) strength distributions, and location of the Gamow-Teller giant resonances using large-scale shell-model with and without first-forbidden (FF) transitions included. Comparison with experimental values from the ENSDF database, and with other theoretical predictions.

doi: 10.1103/PhysRevC.97.054321
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2017CH36      Phys.Rev. C 96, 034301 (2017)

S.Chakraborty, U.Datta, T.Aumann, S.Beceiro Novo, K.Boretzky, C.Caesar, B.V.Carlson, W.N.Catford, M.Chartier, D.Cortina-Gil, G.De Angelis, P.Diaz Fernandez, H.Emling, O.Ershova, L.M.Fraile, H.Geissel, D.Gonzalez-Diaz, H.Johansson, B.Jonson, N.Kalantar-Nayestanaki, T.Kroll, R.Krucken, C.Langer, T.Le Bleis, Y.Leifels, J.Marganiec, G.Munzenberg, M.A.Najafi, T.Nilsson, C.Nociforo, V.Panin, R.Plag, A.Rahaman, R.Reifarth, M.V.Ricciardi, C.Rigollet, D.Rossi, C.Scheidenberger, H.Scheit, H.Simon, J.T.Taylor, Y.Togano, S.Typel, Y.Utsuno, A.Wagner, F.Wamers, H.Weick, J.S.Winfield

Ground-state configuration of neutron-rich 35Al via Coulomb breakup

NUCLEAR REACTIONS C, Pb(35Al, 34Al), E=403 MeV/nucleon, [secondary 35Al beam from fragmentation of 531 MeV/nucleon 40Ar primary beam followed by separation of reaction products using FRS separator at GSI]; measured four-momenta of the projectile, fragments, and other decay products such as fragments, neutrons, and γ rays after secondary reaction using Large Area Neutron Detector for neutrons and Crystal Ball array of NaI(Tl) detectors for γ detection at GSI; deduced inclusive differential Coulomb dissociation (CD) cross section of 35Al breaking up into a neutron and 34Al fragment in its ground state and isomer. 34Al; deduced levels, Coulomb dissociation σ, spectroscopic factors. 35Al; deduced J, π, configurations, spectroscopic factor for the ground state.

doi: 10.1103/PhysRevC.96.034301
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2017DO05      Phys.Rev. C 95, 041301 (2017)

P.Doornenbal, H.Scheit, S.Takeuchi, Y.Utsuno, N.Aoi, K.Li, M.Matsushita, D.Steppenbeck, H.Wang, H.Baba, E.Ideguchi, N.Kobayashi, Y.Kondo, J.Lee, S.Michimasa, T.Motobayashi, T.Otsuka, H.Sakurai, M.Takechi, Y.Togano, K.Yoneda

Low-Z shore of the "island of inversion" and the reduced neutron magicity toward 28O

NUCLEAR REACTIONS 1H, C(30Na, 29F), (30Na, 27F), E=228 MeV/nucleon, [secondary 30Na beam from 9Be(48Ca, X), E=345 MeV/nucleon primary reaction at RIBF-RIKEN facility]; measured reaction residues 27,29F using BigRIPS and ZeroDegree spectrometers, Eγ, Iγ, (27F)γ- and (29F)γ-coin using DALI2 array for γ detection. One-proton and one-proton-two-neutron removal reactions on carbon and polyethylene targets. 27,29F; deduced levels, J, π, binding energy. Comparison with calculations using the SDPF-M interaction, and correlation of 29F and 28O level spectra.

doi: 10.1103/PhysRevC.95.041301
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2017LI07      Phys.Lett. B 767, 58 (2017)

H.N.Liu, J.Lee, P.Doornenbal, H.Scheit, S.Takeuchi, N.Aoi, K.A.Li, M.Matsushita, D.Steppenbeck, H.Wang, H.Baba, E.Ideguchi, N.Kobayashi, Y.Kondo, G.Lee, S.Michimasa, T.Motobayashi, A.Poves, H.Sakurai, M.Takechi, Y.Togano, J.A.Tostevin, Y.Utsuno

Intruder configurations in the ground state of 30Ne

NUCLEAR REACTIONS 12C(30Ne, 29Ne'), E=228 MeV/nucleon; measured reaction products, Eγ, Iγ. 29,30Ne; deduced σ and and spectroscopic factors, J, π. Comparison with SDPF-U-MIX shell model calculations.

doi: 10.1016/j.physletb.2017.01.052
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2017MO26      Phys.Rev. C 96, 034328 (2017)

S.Momiyama, P.Doornenbal, H.Scheit, S.Takeuchi, M.Niikura, N.Aoi, K.Li, M.Matsushita, D.Steppenbeck, H.Wang, H.Baba, E.Ideguchi, M.Kimura, N.Kobayashi, Y.Kondo, J.Lee, S.Michimasa, T.Motobayashi, N.Shimizu, M.Takechi, Y.Togano, Y.Utsuno, K.Yoneda, H.Sakurai

In-beam γ-ray spectroscopy of 35Mg via knockout reactions at intermediate energies

NUCLEAR REACTIONS C(36Mg, 35Mg), E=235 MeV; C(37Al, 35Mg), E=246 MeV, [secondary 36Mg and 37Al beams from 9Be(48Ca, X), E=345 MeV/nucleon primary reaction, followed by separation using BigRIPS separator and Zero Degree spectrometer at RIBF-RIKEN facility]; measured reaction products, Eγ, Iγ, (35Mg)γ-coin, inclusive and γ-ray cross sections, parallel momentum distributions using DALI2 array of 186 large-volume NaI(Tl) crystals. 35Mg; deduced levels, J, π. Comparison with shell-model calculations using SDPF-M interaction, and with antisymmetrized molecular dynamics (AMD) model calculations using Gogny D1S force. C(36Mg, 34Mg), (36Mg, 33Mg), E=235 MeV; measured inclusive σ.

NUCLEAR STRUCTURE 35Mg; calculated levels, J, π, single-particle knockout cross sections, spectroscopic factors using shell-model with SDPF-M interaction, and antisymmetrized molecular dynamics (AMD) model with Gogny D1S force. Comparison with experimental data.

doi: 10.1103/PhysRevC.96.034328
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2017QU05      Phys.Rev. C 96, 044313 (2017)

M.Queiser, A.Vogt, M.Seidlitz, P.Reiter, T.Togashi, N.Shimizu, Y.Utsuno, T.Otsuka, M.Honma, P.Petkov, K.Arnswald, R.Altenkirch, B.Birkenbach, A.Blazhev, T.Braunroth, A.Dewald, J.Eberth, C.Fransen, B.Fu, H.Hess, R.Hetzenegger, R.Hirsch, J.Jolie, V.Karayonchev, L.Kaya, L.Lewandowski, C.Muller-Gatermann, J.-M.Regis, D.Rosiak, D.Schneiders, B.Siebeck, T.Steinbach, K.Wolf, K.-O.Zell

Cross-shell excitations from the fp shell: Lifetime measurements in 61Zn

NUCLEAR REACTIONS 40Ca(24Mg, n2p), E=77 MeV; 58Ni(α, n), E=19 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ), level half-lives by recoil-distance Doppler-shift (RDDS) method using Cologne plunger device and an array of 12 HPGe detectors, and by γγ(t) electronic fast timing technique using eight HPGe detectors and eight LaBr3:Ce detectors at the Tandem accelerator facility of the University of Cologne. 61Zn; deduced high-spin levels, nano-second isomers, J, π, multipolarities, mixing ratios, B(E2), B(E1), B(M1), B(M2), configurations, deformation. Comparison with shell-model calculations using jj44b, GXPF1, GXPF1A, and GXPF1Br+VMU interactions.

doi: 10.1103/PhysRevC.96.044313
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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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2017TR02      Phys.Rev. C 95, 024308 (2017)

V.Tripathi, R.S.Lubna, B.Abromeit, H.L.Crawford, S.N.Liddick, Y.Utsuno, P.C.Bender, B.P.Crider, R.Dungan, P.Fallon, K.Kravvaris, N.Larson, A.O.Macchiavelli, T.Otsuka, C.J.Prokop, A.L.Richard, N.Shimizu, S.L.Tabor, A.Volya, S.Yoshida

β decay of 38, 40Si (Tz =+5, +6) to low-lying core excited states in odd-odd 38-40P isotopes

RADIOACTIVITY 38,40Si(β-), (β-n)[from 9Be(48Ca, X), E=140 MeV/nucleon using A1900 separator at NSCL-MSU facility]; measured Eγ, Iγ, Eβ, γγ-coin, β-correlated γ spectra, half-lives and delayed-neutron probabilities (Pn) of decays of 38Si and 40Si using planar germanium double-sided strip detector (GeDSSD) and SeGA array. 38,40P; deduced levels, J, π, β feedings log ft values. Comparison with known experimental level schemes of 34 and 36P, and with shell model calculations using SDPF-MU interaction. 36,38,40Si(β-); calculated half-lives and log ft values of decays of Si isotopes, beta-delayed neutron probabilities (Pn) using shell model, and compared with experimental values.

NUCLEAR STRUCTURE 34,36,38,40P; calculated levels, J, π, proton and neutron occupancies for the ground state and the three excited 1+ states, Gamow-Teller matrix elements for the 1+ states. Shell model calculations with SDPF-MU interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.024308
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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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2016HE09      Phys.Rev. C 94, 034312 (2016)

H.Heylen, M.De Rydt, G.Neyens, M.L.Bissell, L.Caceres, R.Chevrier, J.M.Daugas, Y.Ichikawa, Y.Ishibashi, O.Kamalou, T.J.Mertzimekis, P.Morel, J.Papuga, A.Poves, M.M.Rajabali, C.Stodel, J.C.Thomas, H.Ueno, Y.Utsuno, N.Yoshida, A.Yoshimi

High-precision quadrupole moment reveals significant intruder component in 3313AL20 ground state

NUCLEAR MOMENTS 31,33Al; measured β-NQR spectra, static electric quadrupole moment by β-detected nuclear quadrupole resonance (β-NQR) method at LISE-GANIL facility. Spin polarized nuclei of 33Al were produced in 9Be(36S, X), E=77 MeV/nucleon reaction. Comparison with large-scale shell model calculations using SDPF-U-MIX interaction. Discussed configurations. Systematics of quadrupole moments for 27,29,31,33Al.

doi: 10.1103/PhysRevC.94.034312
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2016IW02      Phys.Rev.Lett. 116, 112502 (2016)

Y.Iwata, N.Shimizu, T.Otsuka, Y.Utsuno, J.Menendez, M.Honma, T.Abe

Large-Scale Shell-Model Analysis of the Neutrinoless ββ Decay of 48Ca

RADIOACTIVITY 48Ca(2β-); calculated nuclear matrix element for the neutrinoless double-beta decay using large-scale shell-model calculations.

doi: 10.1103/PhysRevLett.116.112502
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2016LE21      Prog.Theor.Exp.Phys. 2016, 083D01 (2016)

J.Lee, H.Liu, P.Doornenbal, M.Kimura, K.Minomo, K.Ogata, Y.Utsuno, N.Aoi, K.Li, M.Matsushita, H.Scheit, D.Steppenbeck, S.Takeuchi, H.Wang, H.Baba, E.Ideguchi, N.Kobayashi, Y.Kondo, S.Michimasa, T.Motobayashi, H.Sakurai, M.Takechi, Y.Togano

Asymmetry dependence of reduction factors from single-nucleon knockout of 30Ne at ∼ 230 MeV/nucleon

NUCLEAR STRUCTURE 29F, 29,30Ne; calculated structure, energy, spectroscopic factor for proton states in 29F and neutron ones in 29Ne using shell model in sd-pf model space and using AMD (Antisymmetrized Molelcular Dynamics).

NUCLEAR REACTIONS 12C(30Ne, 29F), (30Ne, 29Ne), E≈230 MeV/nucleon; measured 29F, 30Ne residues using ZeroDegree Spectrometer, Eγ, Iγ using detector array DALI2 of 186 NaI(Tl) scintillators; calculated inclusive deeply-bound one-nucleon knock-out σ using eikonal theory with wave functions, densities, spectroscopic factors from shell model and from AMD; deduced σ dependence on separation energy asymmetry and on nuclear radius parameter. Compared with data.

doi: 10.1093/ptep/ptw096
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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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2015ST10      Phys.Rev.Lett. 114, 252501 (2015)

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

Low-Lying Structure of 50Ar and the N=32 Subshell Closure

NUCLEAR REACTIONS 9Be(54Ca, X), (55Sc, X), (56Ti, X)50Ar, E=220 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced level energy, J, π. Comparison with large-scale shell-model calculations performed in the sdpf model space using the SDPF-MU effective interaction.

doi: 10.1103/PhysRevLett.114.252501
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2015ST14      Eur.Phys.J. A 51, 117 (2015)

K.Steiger, S.Nishimura, Z.Li, R.Gernhauser, Y.Utsuno, R.Chen, T.Faestermann, C.Hinke, R.Krucken, M.Kurata-Nishimura, G.Lorusso, Y.Miyashita, N.Shimizu, K.Sugimoto, T.Sumikama, H.Watanabe, K.Yoshinaga

Nuclear structure of 37, 38Si investigated by decay spectroscopy of 37, 38Al

RADIOACTIVITY 37,38Al(β-)[from 48Ca projectile fragmentation at 345 MeV/nucleon]; measured β-delayed Eγ, Iγ, γγ-coin; deduced T1/2. 37,38Si deduced levels, J, π, γ transitions; calculated levels, J, π using shell model with SDPF-MU and modified SDPF-MU interaction.

doi: 10.1140/epja/i2015-15117-9
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2015TO04      Phys.Rev. C 91, 024320 (2015)

T.Togashi, N.Shimizu, Y.Utsuno, T.Otsuka, M.Honma

Large-scale shell-model calculations for unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes

NUCLEAR STRUCTURE 55,56,57,58,59Cr, 57,58,59,60,61Fe; calculated levels, J, π, total energy surface contours in (Q0, Q2) plane, electric spectroscopic and intrinsic quadrupole moments, natural positive-parity and unnatural negative-parity high-spin states in 56,58Cr, 58,60Fe. 53,55,57,59Cr, 55,57,59,61Fe, 57,59,61,63Ni; calculated energies of 9/2+ states and one-neutron transfer spectroscopic factors. Z=24, N=22-35; Z=26, N=22-35; calculated effective single-particle energies (ESPEs) of a neutron. Large-scale shell-model calculations in fp-shell+0g9/2+1d5/2 space with GXPF1Br Hamiltonian. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.024320
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2015UT01      Phys.Rev.Lett. 114, 032501 (2015)

Y.Utsuno, N.Shimizu, T.Otsuka, T.Yoshida, Y.Tsunoda

Nature of Isomerism in Exotic Sulfur Isotopes

NUCLEAR STRUCTURE 43,44S; calculated energy levels, J, π, deformation parameters. Nuclear shell model, comparison with available data.

doi: 10.1103/PhysRevLett.114.032501
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2014DO05      Prog.Theor.Exp.Phys. 2014, 053D01 (2014)

P.Doornenbal, H.Scheit, S.Takeuchi, Y.Utsuno, N.Aoi, K.Li, M.Matsushita, D.Steppenbeck, H.Wang, H.Baba, E.Ideguchi, N.Kobayashi, Y.Kondo, J.Lee, S.Michimasa, T.Motobayashi, T.Otsuka, H.Sakurai, M.Takechi, Y.Togano, K.Yoneda

Rotational level structure of sodium isotopes inside the "island of inversion"

NUCLEAR REACTIONS H, C(36Mg, X)33Na/34Na/35Na, E=236 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, B(E2), B(M1). Shell model calculations, comparison with systematics and available data.

doi: 10.1093/ptep/ptu057
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2014KO14      Phys.Rev.Lett. 112, 242501 (2014)

N.Kobayashi, T.Nakamura, Y.Kondo, J.A.Tostevin, Y.Utsuno, N.Aoi, H.Baba, R.Barthelemy, M.A.Famiano, N.Fukuda, N.Inabe, M.Ishihara, R.Kanungo, S.Kim, T.Kubo, G.S.Lee, H.S.Lee, M.Matsushita, T.Motobayashi, T.Ohnishi, N.A.Orr, H.Otsu, T.Otsuka, T.Sako, H.Sakurai, Y.Satou, T.Sumikama, H.Takeda, S.Takeuchi, R.Tanaka, Y.Togano, K.Yoneda

Observation of a p-Wave One-Neutron Halo Configuration in 37Mg

NUCLEAR REACTIONS C, Pb(37Mg, 36Mg'), E=240-244 MeV/nucleon; measured reaction products, Eγ, Iγ. 36,37Mg; deduced 1-n removal σ, spectroscopic factors, neutron separation energy, J, π. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.112.242501
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2014NA10      Phys.Rev.Lett. 112, 142501 (2014)

T.Nakamura, N.Kobayashi, Y.Kondo, Y.Satou, J.A.Tostevin, Y.Utsuno, N.Aoi, H.Baba, N.Fukuda, J.Gibelin, N.Inabe, M.Ishihara, D.Kameda, T.Kubo, T.Motobayashi, T.Ohnishi, N.A.Orr, H.Otsu, T.Otsuka, H.Sakurai, T.Sumikama, H.Takeda, E.Takeshita, M.Takechi, S.Takeuchi, Y.Togano, K.Yoneda

Deformation-Driven p-Wave Halos at the Drip Line: 31Ne

NUCLEAR REACTIONS C, Pb(31Ne, n)30Ne, E=230, 234 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced partial and inclusive n-removal σ, parallel momentum distributions, neutron halo. Comparison with eikonal calculations.

doi: 10.1103/PhysRevLett.112.142501
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2014SA46      Phys.Lett. B 736, 137 (2014)

A.Sanetullaev, M.B.Tsang, W.G.Lynch, Jenny Lee, D.Bazin, K.P.Chan, D.Coupland, V.Henzl, D.Henzlova, M.Kilburn, A.M.Rogers, Z.Y.Sun, M.Youngs, R.J.Charity, L.G.Sobotka, M.Famiano, S.Hudan, D.Shapira, W.A.Peters, C.Barbieri, M.Hjorth-Jensen, M.Horoi, T.Otsuka, T.Suzuki, Y.Utsuno

Neutron spectroscopic factors of 55Ni hole-states from image transfer reactions

NUCLEAR REACTIONS 1H(56Ni, d), E=37 MeV/nucleon; measured reaction products; deduced spectroscopic factors, J, π, σ(θ). Comparison with shell model calculations.

doi: 10.1016/j.physletb.2014.07.003
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2014SU05      Phys.Rev. C 89, 021301 (2014)

S.Suchyta, S.N.Liddick, Y.Tsunoda, T.Otsuka, M.B.Bennett, A.Chemey, M.Honma, N.Larson, C.J.Prokop, S.J.Quinn, N.Shimizu, A.Simon, A.Spyrou, V.Tripathi, Y.Utsuno, J.M.VonMoss

Shape coexistence in 68Ni

RADIOACTIVITY 68Co(β-)[from 9Be(76Ge, X), E=130 MeV/nucleon]; measured Eγ, Iγ, γγ-coin, internal transitions, internal-conversion decay, electron-positron pair production from first excited 0+ state using germanium double-sided strip detector (GeDSSD) and SeGA array at NSCL-MSU facility. 68Ni; deduced level energy of first excited 0+ state, E0 transition strength, level half-life, difference in deformation between the excited 0+ state and the ground state. Comparison with Monte-Carlo shell-model calculations using several interactions, and with experimental data for excited 0+ states in 90Zr.

doi: 10.1103/PhysRevC.89.021301
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2014TS02      Phys.Rev. C 89, 031301 (2014)

Y.Tsunoda, T.Otsuka, N.Shimizu, M.Honma, Y.Utsuno

Novel shape evolution in exotic Ni isotopes and configuration-dependent shell structure

NUCLEAR STRUCTURE 56,58,60,62,64,66,68,70,72,74,76,78Ni; calculated levels, J, π, B(E2) for first 2+ states, potential energy surface contours in (Q0, Q2) plane. Interplays among spherical, oblate, prolate, γ-unstable shapes, and E(5)-like fluctuations. Coexistence of spherical and strongly deformed shapes. Large-scale Monte Carlo shell model (MCSM). Comparison with experimental data.

doi: 10.1103/PhysRevC.89.031301
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2013FL01      Phys.Rev.Lett. 110, 122503 (2013)

F.Flavigny, A.Gillibert, L.Nalpas, A.Obertelli, N.Keeley, C.Barbieri, D.Beaumel, S.Boissinot, G.Burgunder, A.Cipollone, A.Corsi, J.Gibelin, S.Giron, J.Guillot, F.Hammache, V.Lapoux, A.Matta, E.C.Pollacco, R.Raabe, M.Rejmund, N.de Sereville, A.Shrivastava, A.Signoracci, Y.Utsuno

Limited Asymmetry Dependence of Correlations from Single Nucleon Transfer

NUCLEAR REACTIONS 2H(14O, t), (14O, 3He), E=17.8 MeV/nucleon; measured reaction products; deduced σ(θ) for transfer and elastic scattering, reduction factors. Comparison with shell model and ab initio calculations.

doi: 10.1103/PhysRevLett.110.122503
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2013LI32      J.Phys.:Conf.Ser. 445, 012005 (2013)

L.Liu, T.Otsuka, N.Shimizu, Y.Utsuno, R.Roth

No-Core MCSM calculation for 10Be and 12Be low-lying spectra

NUCLEAR STRUCTURE 10Be; calculated levels, J, π. 10Be, 10C; calculated B(E2). NCMCSM (No-core Monte Carlo Shell Model); compared to data. Also 12Be mentioned, but no results presented.

doi: 10.1088/1742-6596/445/1/012005
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2013PA11      Phys.Rev.Lett. 110, 172503 (2013)

J.Papuga, M.L.Bissell, K.Kreim, K.Blaum, B.A.Brown, M.De Rydt, R.F.Garcia Ruiz, H.Heylen, M.Kowalska, R.Neugart, G.Neyens, W.Nortershauser, T.Otsuka, M.M.Rajabali, R.Sanchez, Y.Utsuno, D.T.Yordanov

Spins and Magnetic Moments of 49K and 51K: Establishing the 1/2+ and 3/2+ Level Ordering Beyond N=28

NUCLEAR MOMENTS 39,47,49,51K; measured hyperfine spectra; deduced dipole magnetic moments, g-factors. Comparison with available data, shell model calculations.

doi: 10.1103/PhysRevLett.110.172503
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2013SH28      J.Phys.:Conf.Ser. 445, 012004 (2013)

N.Shimizu, T.Otsuka, Y.Utsuno, T.Mizusaki, M.Honma, T.Abe

History and future perspectives of the Monte Carlo shell model -from Alphleet to K computer-

doi: 10.1088/1742-6596/445/1/012004
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2013ST15      J.Phys.:Conf.Ser. 445, 012012 (2013)

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

Investigating the strength of the N = 34 subshell closure in 54Ca

NUCLEAR REACTIONS 9Be(55Sc, X), (56Ti, X), E=345 MeV/nucleon; measured in-beam Iγ, Eγ, (fragment)γ-coin. 53,54Ca deduced γ transitions, E(2+), E(3-). Compared with shell-model predictions and with data on other Ca isotopes.

doi: 10.1088/1742-6596/445/1/012012
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2013ST20      Nature(London) 502, 207 (2013)

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

Evidence for a new nuclear 'magic number' from the level structure of 54Ca

NUCLEAR REACTIONS Be(55Sc, p), (55Sc, np), (56Ti, 2p), (56Ti, n2p), E =345 MeV/nucleon; measured reaction products, Eγ, Iγ. 53,54Ca; deduced level energies, J, π. Comparison with shell model calculations using the modified GXPF1B Hamiltonian.

doi: 10.1038/nature12522
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2013TS02      J.Phys.:Conf.Ser. 445, 012028 (2013)

Y.Tsunoda, T.Otsuka, N.Shimizu, M.Honma, Y.Utsuno

Study of nuclei around Z = 28 by large-scale shell model calculations

NUCLEAR STRUCTURE 48,50,52,54,56,58,60,62,64,66,68,70,72,74Cr, 56,58,60,62,64,66,68,70,72,74,76,78Ni; calculated low-lying levels, J, π, B(E2), deformation using large-scale Monte Carlo shell model. Compared to data.

doi: 10.1088/1742-6596/445/1/012028
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2013UT01      J.Phys.:Conf.Ser. 445, 012008 (2013)

Y.Utsuno

Towards unified description of shell evolution - Takaharu Otsuka's achievements

doi: 10.1088/1742-6596/445/1/012008
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2012AB14      Phys.Rev. C 86, 054301 (2012)

T.Abe, P.Maris, T.Otsuka, N.Shimizu, Y.Utsuno, J.P.Vary

Benchmarks of the full configuration interaction, Monte Carlo shell model, and no-core full configuration methods

NUCLEAR STRUCTURE 4,6He, 6,7Li, 8Be, 10B, 12C, 16O; calculated levels, point-particle rms radii, electromagnetic moments using the full configuration interaction (FCI), Monte Carlo shell model (MCSM), and no core full configuration (NCFC) approaches using realistic JISP16 nucleon-nucleon interaction.

doi: 10.1103/PhysRevC.86.054301
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2012DI04      Phys.Rev. C 85, 034311 (2012)

E.S.Diffenderfer, L.T.Baby, D.Santiago-Gonzalez, N.Ahsan, A.Rojas, A.Volya, I.Wiedenhover, A.H.Wuosmaa, M.P.Carpenter, R.V.F.Janssens, C.J.Lister, M.Devlin, D.G.Sarantites, L.G.Sobotka, Y.Utsuno, M.Horoi

High-spin spectrum of 24Mg studied through multiparticle angular correlations

NUCLEAR REACTIONS 12C(16O, α)24Mg, E=62, 68 MeV; measured Eα, Iα, αγ-coin, αγ(θ), αγγ(θ) using Gammasphere array. Experiments carried out at ANL and FSU facilities. 24Mg; deduced levels, J, π, configurations. Comparison with previous studies and shell model calculations.

doi: 10.1103/PhysRevC.85.034311
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2012LI32      Phys.Rev. C 86, 014302 (2012)

L.Liu, T.Otsuka, N.Shimizu, Y.Utsuno, R.Roth

No-core Monte Carlo shell-model calculation for 10Be and 12Be low-lying spectra

NUCLEAR STRUCTURE 4He; calculated ground-state energy as a function of harmonic oscillator parameter, center of mass motion energy. 10,12Be, 10C; calculated levels, J, π, B(E2), deformation parameter, spectroscopic quadrupole moments, single-particle-orbit occupation numbers. No-core Monte Carlo shell-model (MCSM) with unitary correlation operator method (UCOM). Comparison with experimental data.

doi: 10.1103/PhysRevC.86.014302
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2012SH13      Phys.Rev. C 85, 054301 (2012)

N.Shimizu, Y.Utsuno, T.Mizusaki, M.Honma, Y.Tsunoda, T.Otsuka

Variational procedure for nuclear shell-model calculations and energy-variance extrapolation

NUCLEAR STRUCTURE 64,72Ge; calculated energy vs. energy variance plot for 0+ ground state and first excited 0+ state. 72Ge; calculated total energy surface contours. Shell-model calculations with energy-variance extrapolation (EVE) method and wavefunctions from linear combinations of the parity, angular-momentum projected Slater determinants.

doi: 10.1103/PhysRevC.85.054301
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2012SH22      Phys.Lett. B 714, 246 (2012)

K.Shimada, H.Ueno, G.Neyens, K.Asahi, D.L.Balabanski, J.M.Daugas, M.Depuydt, M.De Rydt, L.Gaudefroy, S.Grevy, Y.Hasama, Y.Ichikawa, D.Kameda, P.Morel, T.Nagatomo, L.Perrot, Ch.Stodel, J.-C.Thomas, Y.Utsuno, W.Vanderheijden, N.Vermeulen, P.Vingerhoets, E.Yagi, K.Yoshida, A.Yoshimi

Erosion of N = 20 shell in 33Al investigated through the ground-state electric quadrupole moment

NUCLEAR MOMENTS 33Al; measured NMR spectrum; deduced ground state electric quadrupole moment. Comparison with shell model calculations.

doi: 10.1016/j.physletb.2012.07.030
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2012UT01      Prog.Theor.Phys.(Kyoto), Suppl. 196, 304 (2012)

Y.Utsuno, T.Otsuka, B.A.Brown, M.Honma, T.Mizusaki, N.Shimizu

Shell Evolution around and beyond N=28 Studied with Large-Scale Shell-Model Calculations

NUCLEAR STRUCTURE 40,42,44,46,48,50,52Ca; calculated energy levels, distribution of spectroscopic factors; deduced evolution of shell structure. Comparison with experimental data.

doi: 10.1143/PTPS.196.304
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2012UT02      Phys.Rev. C 86, 051301 (2012)

Y.Utsuno, T.Otsuka, B.A.Brown, M.Honma, T.Mizusaki, N.Shimizu

Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect

NUCLEAR STRUCTURE 36,38,40,42Si, 38,40,42,44S; calculated levels, J, π, B(E2), S(2n), potential-energy surfaces. 40,42,44,46Ar, 42,44,46,48Ca; calculated S(2n). 48Ca(e, e'p); calculated spectroscopic factors. Shell-model calculations with tensor-force component of the Hamiltonian. Jahn-Teller type effect. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.051301
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2011GA15      Phys.Rev. C 83, 044305 (2011)

A.Gade, D.Bazin, B.A.Brown, C.M.Campbell, J.M.Cook, S.Ettenauer, T.Glasmacher, K.W.Kemper, S.McDaniel, A.Obertelli, T.Otsuka, A.Ratkiewicz, J.R.Terry, Y.Utsuno, D.Weisshaar

In-beam γ -ray spectroscopy of 35Mg and 33Na

NUCLEAR REACTIONS 9Be(38Si, X)33Na/35Mg/36Mg/38Si, E=83 MeV/nucleon, [secondary 38Si beam from 9Be(48Ca, X), E=140 MeV/nucleon primary reaction]; measured Eγ, production σ, (33Na)γ-, (35Mg)γ-coin using SeGA array. 33Na, 35Mg; deduced levels, J, π, rotational band in 33Na. Comparison with large-scale Monte-Carlo shell model (MCSM) calculations with SDPF-M interaction, and with large-scale shell-model calculations with SDPF-U interaction. Calculated composition of 35Mg wave functions, quadrupole moments and B(E2) values. Systematics of S(n) for A=30-35 Mg nuclei. Relevance to Island of Inversion.

doi: 10.1103/PhysRevC.83.044305
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2011KA01      Phys.Rev. C 83, 021302 (2011)

R.Kanungo, A.Prochazka, W.Horiuchi, C.Nociforo, T.Aumann, D.Boutin, D.Cortina-Gil, B.Davids, M.Diakaki, F.Farinon, H.Geissel, R.Gernhauser, J.Gerl, R.Janik, B.Jonson, B.Kindler, R.Knobel, R.Krucken, M.Lantz, H.Lenske, Y.Litvinov, B.Lommel, K.Mahata, P.Maierbeck, A.Musumarra, T.Nilsson, C.Perro, C.Scheidenberger, B.Sitar, P.Strmen, B.Sun, Y.Suzuki, I.Szarka, I.Tanihata, Y.Utsuno, H.Weick, M.Winkler

Matter radii of 32-35Mg

NUCLEAR REACTIONS C, H(32Mg, X), (33Mg, X)(34Mg, X)(35Mg, X), E=900 MeV/nucleon, [secondary Mg beams from Be(48Ca, X) primary reaction]; measured interaction cross sections by detecting unreacted Mg particles by Bρ-ΔE-TOF method. 32,33,34,35Mg; deduced matter radii by Glauber model analysis. Comparison with HF and RMF predictions. Neutron skin thickness.

doi: 10.1103/PhysRevC.83.021302
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2011UT01      Phys.Rev. C 83, 021301 (2011)

Y.Utsuno, S.Chiba

Multiparticle-multihole states around 16O and correlation-energy effect on the shell gap

NUCLEAR STRUCTURE 12C, 15,16,17O, 20Ne, 52,60Fe, 55,56,57Ni; calculated cross shell correlation energies. 16,18,20O, 20Ne; calculated first three 0+ states. Shell-model calculation in the full p-sd model space using PSDWBT and GXPF1A interactions.

doi: 10.1103/PhysRevC.83.021301
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2010DE26      Phys.Rev. C 82, 034305 (2010)

A.N.Deacon, J.F.Smith, S.J.Freeman, R.V.F.Janssens, M.P.Carpenter, B.Hadinia, C.R.Hoffman, B.P.Kay, T.Lauritsen, C.J.Lister, D.O'Donnell, J.Ollier, T.Otsuka, D.Seweryniak, K.-M.Spohr, D.Steppenbeck, S.L.Tabor, V.Tripathi, Y.Utsuno, P.T.Wady, S.Zhu

Cross-shell excitations near the "island of inversion": Structure of 30Mg

NUCLEAR REACTIONS 14C(18O, 2p), E=37 MeV; measured Eγ, Iγ, γγ-, (30Mg)γ-coin, γ(θ) using Gammasphere array, enriched 14C target. 30Mg; deduced levels, J, π, multipolarities. Comparison with shell-model calculations using the USD and SDPF-M interactions, and the Monte Carlo shell model. Systematics of first 2+ and 4+ states in 24,26,28,30,32,34Mg.

NUCLEAR REACTIONS 14C(18O, 2p)26Mg/30Mg/30Al/30Si, E=37 MeV; measured Eγ and yields.

doi: 10.1103/PhysRevC.82.034305
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2010FA04      Phys.Rev. C 81, 041302 (2010)

P.Fallon, E.Rodriguez-Vieitez, A.O.Macchiavelli, A.Gade, J.A.Tostevin, P.Adrich, D.Bazin, M.Bowen, C.M.Campbell, R.M.Clark, J.M.Cook, M.Cromaz, D.C.Dinca, T.Glasmacher, I.Y.Lee, S.McDaniel, W.F.Mueller, S.G.Prussin, A.Ratkiewicz, K.Siwek, J.R.Terry, D.Weisshaar, M.Wiedeking, K.Yoneda, B.A.Brown, T.Otsuka, Y.Utsuno

Two-proton knockout from 32Mg: Intruder amplitudes in 30Ne and implications for the binding of 29, 31F

NUCLEAR REACTIONS 9Be(32Mg, 30Ne), E=86.7, 99.7 MeV/nucleon; measured Eγ, Iγ, and σ using SeGA array. 32Mg beam from 9Be(48Ca, X), E=140 MeV/nucleon. 30Ne; deduced levels, J, π, intruder configuration. 29,31F; discussed implications for binding energies. 32Mg; deduced configuration. Comparison with large-scale shell model calculations.

doi: 10.1103/PhysRevC.81.041302
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2010KA05      Phys.Lett. B 685, 253 (2010)

R.Kanungo, C.Nociforo, A.Prochazka, Y.Utsuno, T.Aumann, D.Boutin, D.Cortina-Gil, B.Davids, M.Diakaki, F.Farinon, H.Geissel, R.Gernhauser, J.Gerl, R.Janik, B.Jonson, B.Kindler, R.Knobel, R.Krucken, M.Lantz, H.Lenske, Y.Litvinov, K.Mahata, P.Maierbeck, A.Musumarra, T.Nilsson, T.Otsuka, C.Perro, C.Scheidenberger, B.Sitar, P.Strmen, B.Sun, I.Szarka, I.Tanihata, H.Weick, M.Winkler

Structure of 33Mg sheds new light on the N=20 island of inversion

NUCLEAR REACTIONS C(33Mg, 32Mg), E=898 MeV/nucleon; measured 32Mg fragments using MUSIC setup at GSI, σ, longitudinal momentum distribution. 33Mg; deduced ground state configuration, relevance to 'Island of Inversion'. Monte Carlo shell model (MCSM) calculation with the SDPF-M interaction. 33Mg beam produced in Be(48Ca, X) at 1 GeV/nucleon.

doi: 10.1016/j.physletb.2010.02.008
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2010OT01      Phys.Rev.Lett. 104, 012501 (2010)

T.Otsuka, T.Suzuki, M.Honma, Y.Utsuno, N.Tsunoda, K.Tsukiyama, M.Hjorth-Jensen

Novel Features of Nuclear Forces and Shell Evolution in Exotic Nuclei

NUCLEAR STRUCTURE Z=8-20, 28, 40, N=20, 40-50; 40Ca, 68Ni, 78Ni, 90Zr, 100Sn; calculated monopole matrix elements, single-particle energies for pf and sd-shells; deduced monopole-based universal interaction, shell evolution. Comparison with USD, KB3, GXPF1A interactions.

doi: 10.1103/PhysRevLett.104.012501
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2010SH30      Phys.Rev. C 82, 061305 (2010)

N.Shimizu, Y.Utsuno, T.Mizusaki, T.Otsuka, T.Abe, M.Honma

Novel extrapolation method in the Monte Carlo shell model

NUCLEAR STRUCTURE 56Ni, 64Ge; calculated ground and excited state energies and quadrupole moments using Monte-Carlo shell-model (MCSM).

doi: 10.1103/PhysRevC.82.061305
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2010TR03      Phys.Rev.Lett. 104, 129202 (2010)

V.Tripathi, S.L.Tabor, P.F.Mantica, Y.Utsuno, P.Bender, J.Cook, C.R.Hoffman, S.Lee, T.Otsuka, J.Pereira, M.Perry, K.Pepper, J.S.Pinter, J.Stoker, A.Volya, D.Weisshaar

Reply: "Intruder Configurations in the A=33 Isobars: 33Mg and 33Al"

NUCLEAR STRUCTURE 33Mg; analyzed 33Mg β-decay data; deduced 33Mg π.

doi: 10.1103/PhysRevLett.104.129202
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2009DE25      Phys.Lett. B 678, 344 (2009)

M.De Rydt, G.Neyens, K.Asahi, D.L.Balabanski, J.M.Daugas, M.Depuydt, L.Gaudefroy, S.Grevy, Y.Hasama, Y.Ichikawa, P.Morel, T.Nagatomo, T.Otsuka, L.Perrot, K.Shimada, C.Stodel, J.C.Thomas, H.Ueno, Y.Utsuno, W.Vanderheijden, N.Vermeulen, P.Vingerhoets, A.Yoshimi

Precision measurement of the electric quadrupole moment of 31Al and determination of the effective proton charge in the sd-shell

RADIOACTIVITY 31Al(β-); measured electric quadrupole coupling constant; deduced quadrupole moment, proton effective charge using two β-NQR techniques. Comparison with shell model. Quadrupole systematics in nearby nuclei discussed.

doi: 10.1016/j.physletb.2009.06.043
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2009IO01      Phys.Rev. C 80, 034314 (2009)

M.Ionescu-Bujor, A.Iordachescu, S.M.Lenzi, D.R.Napoli, N.Marginean, N.H.Medina, D.Bazzacco, D.Bucurescu, G.de Angelis, F.Della Vedova, E.Farnea, A.Gadea, R.Menegazzo, S.Lunardi, C.A.Ur, S.Zilio, T.Otsuka, Y.Utsuno

High-spin structure of 37Cl, intruder excitations, and the sd-fp shell gap

NUCLEAR REACTIONS 24Mg(16O, 3p), E=70 MeV; measured Eγ, Iγ, γγ-coin, angular distributions, half-lives using Doppler shift attenuation method using GASP array. 37Cl; deduced levels, J, π, multipolarities, B(M1), B(E2) and configurations. Comparison with large-scale shell model calculations involving sd and fp orbitals using the sdpf and SDPF-M effective interactions.

doi: 10.1103/PhysRevC.80.034314
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2009KA14      Phys.Rev.Lett. 102, 152501 (2009)

R.Kanungo, C.Nociforo, A.Prochazka, T.Aumann, D.Boutin, D.Cortina-Gil, B.Davids, M.Diakaki, F.Farinon, H.Geissel, R.Gernhauser, J.Gerl, R.Janik, B.Jonson, B.Kindler, R.Knobel, R.Krucken, M.Lantz, H.Lenske, Y.Litvinov, B.Lommel, K.Mahata, P.Maierbeck, A.Musumarra, T.Nilsson, T.Otsuka, C.Perro, C.Scheidenberger, B.Sitar, P.Strmen, B.Sun, I.Szarka, I.Tanihata, Y.Utsuno, H.Weick, M.Winkler

One-Neutron Removal Measurement Reveals 24O as a New Doubly Magic Nucleus

NUCLEAR REACTIONS 12C(24O, 23O), E=920 MeV/nucleon; measured fragment spectra. 24O; deduced one neutron removal spectroscopic factor. 23O; deduced level energies.

doi: 10.1103/PhysRevLett.102.152501
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2009NA39      Phys.Rev.Lett. 103, 262501 (2009)

T.Nakamura, N.Kobayashi, Y.Kondo, Y.Satou, N.Aoi, H.Baba, S.Deguchi, N.Fukuda, J.Gibelin, N.Inabe, M.Ishihara, D.Kameda, Y.Kawada, T.Kubo, K.Kusaka, A.Mengoni, T.Motobayashi, T.Ohnishi, M.Ohtake, N.A.Orr, H.Otsu, T.Otsuka, A.Saito, H.Sakurai, S.Shimoura, T.Sumikama, H.Takeda, E.Takeshita, M.Takechi, S.Takeuchi, K.Tanaka, K.N.Tanaka, N.Tanaka, Y.Togano, Y.Utsuno, K.Yoneda, A.Yoshida, K.Yoshida

Halo Structure of the Island of Inversion Nucleus 31Ne

NUCLEAR REACTIONS Pb, C(31Ne, 30Ne), (19C, 18C) E=230-243 MeV/nucleon; 31Ne, 19C; measured reaction fragments; deduced inclusive one-neutron removal σ, soft E1 excitations for 31Ne, B(E1). Secondary beams from 48Ca fragmentation.

doi: 10.1103/PhysRevLett.103.262501
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2008ET01      Phys.Rev. C 78, 017302 (2008)

S.Ettenauer, H.Zwahlen, P.Adrich, D.Bazin, C.M.Campbell, J.M.Cook, A.D.Davies, D.-C.Dinca, A.Gade, T.Glasmacher, J.-L.Lecouey, W.F.Mueller, T.Otsuka, R.R.Reynolds, L.A.Riley, J.R.Terry, Y.Utsuno, K.Yoneda

Intermediate-energy Coulomb excitation of 30Na

NUCLEAR REACTIONS 209Bi(30Na, 30Na'), E=80.1 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin, σ(θ). 30Na; deduced B(E2). Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.78.017302
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2008HI01      Phys.Lett. B 658, 203 (2008)

P.Himpe, G.Neyens, D.L.Balabanski, G.Belier, J.M.Daugas, F.de Oliveira Santos, M.De Rydt, K.T.Flanagan, I.Matea, P.Morel, Yu.E.Penionzhkevich, L.Perrot, N.A.Smirnova, C.Stodel, J.C.Thomas, N.Vermeulen, D.T.Yordanov, Y.Utsuno, T.Otsuka

g factor of the exotic N = 21 isotope 34Al: probing the N = 20 and N = 28 shell gaps at the border of the "island of inversion"

RADIOACTIVITY 34Al(β-); measured β-assymetry. 34Al; deduced g-factor, μ; deduced ground state J, π and intruder configuration contribution.

doi: 10.1016/j.physletb.2007.11.017
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2008MI07      Phys.Lett. B 662, 389 (2008)

K.Minamisono, P.F.Mantica, H.L.Crawford, J.S.Pinter, J.B.Stoker, Y.Utsuno, R.R.Weerasiri

Quadrupole moment of 37K

RADIOACTIVITY 37K(β+); measured electric quadrupole moment using the β-NQR technique. 35S, 37Ar, 35,37,39K, 39Ca; analyzed electric quadrupole moment using shell model and effective charge dependency.

doi: 10.1016/j.physletb.2008.03.049
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2008OT04      Nucl.Phys. A805, 127c (2008)

T.Otsuka, T.Suzuki, Y.Utsuno

Exotic Nuclei and Yukawa's Forces

doi: 10.1016/j.nuclphysa.2008.02.245
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2008RI04      Phys.Rev. C 78, 011303 (2008)

L.A.Riley, P.Adrich, T.R.Baugher, D.Bazin, B.A.Brown, J.M.Cook, P.D.Cottle, C.Aa.Diget, A.Gade, D.A.Garland, T.Glasmacher, K.E.Hosier, K.W.Kemper, T.Otsuka, W.D.M.Rae, A.Ratkiewicz, K.P.Siwek, J.A.Tostevin, Y.Utsuno, D.Weisshaar

d5/2 proton hole strength in neutron-rich 43P: Shell structure and nuclear shapes near N = 28

NUCLEAR REACTIONS 9Be(44S, p43P), E=91.7 MeV/nucleon; measured Eγ, Iγ, γγ-, (particle)γ-coin, partial σ, momentum distributions. 43P; deduced levels, J, π. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.78.011303
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2008TE02      Phys.Rev. C 77, 014316 (2008)

J.R.Terry, B.A.Brown, C.M.Campbell, J.M.Cook, A.D.Davies, D.-C.Dinca, A.Gade, T.Glasmacher, P.G.Hansen, B.M.Sherrill, H.Zwahlen, D.Bazin, K.Yoneda, J.A.Tostevin, T.Otsuka, Y.Utsuno, B.Pritychenko

Single-neutron knockout from intermediate energy beams of 30, 32Mg: "Mapping the transition into the "island of inversion"

NUCLEAR REACTIONS 9Be(30Mg, 29Mg), E=85.8 MeV/nucleon; 9Be(32Mg, 31Mg), E=75.7 MeV/nucleon; measured Eγ, Iγ, (fragment)γ-coin, cross sections; deduced spectroscopic factors. 29,31Mg; deduced levels, angular momenta, half-lives. Single-particle knockout reaction.

doi: 10.1103/PhysRevC.77.014316
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2008TR04      Phys.Rev. C 77, 034310 (2008)

V.Tripathi, S.L.Tabor, P.Bender, C.R.Hoffman, S.Lee, K.Pepper, M.Perry, P.F.Mantica, J.M.Cook, J.Pereira, J.S.Pinter, J.B.Stoker, D.Weisshaar, Y.Utsuno, T.Otsuka

Excited intruder states in 32Mg

NUCLEAR REACTIONS 9Be(48Ca, X)30Na/31Na/32Na/33Mg, E=140 MeV/nucleon; measured yields.

RADIOACTIVITY 32Na(β-), (β-n) [from 9Be(48Ca, X), E=140 MeV/nucleon]; measured Eγ, Iγ, γγ-coin, half-lives; deduced Iβ, B(GT), logft. 32Mg; deduced levels, Jπ. 26,28,30,34,36Mg, 28,30,32,34,36,38Si; systematics. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.77.034310
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2008TR07      Phys.Rev.Lett. 101, 142504 (2008)

V.Tripathi, S.L.Tabor, P.F.Mantica, Y.Utsuno, P.Bender, J.Cook, C.R.Hoffman, S.Lee, T.Otsuka, J.Pereira, M.Perry, K.Pepper, J.S.Pinter, J.Stoker, A.Volya, D.Weisshaar

Intruder Configurations in the A=33 Isobars: 33Mg and 33Al

RADIOACTIVITY 33Mg(β-); measured Eγ, Iγ. 33Al; deduced levels, J, π, configurations. Compared results to model calculations.

doi: 10.1103/PhysRevLett.101.142504
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