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NSR database version of April 11, 2024.

Search: Author = Y.Tsunoda

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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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2023II01      Phys.Rev.Lett. 130, 012501 (2023)

S.Iimura, M.Rosenbusch, A.Takamine, Y.Tsunoda, M.Wada, S.Chen, D.S.Hou, W.Xian, H.Ishiyama, S.Yan, P.Schury, H.Crawford, P.Doornenbal, Y.Hirayama, Y.Ito, S.Kimura, T.Koiwai, T.M.Kojima, H.Koura, J.Lee, J.Liu, S.Michimasa, H.Miyatake, J.Y.Moon, S.Naimi, S.Nishimura, T.Niwase, A.Odahara, T.Otsuka, S.Paschalis, M.Petri, N.Shimizu, T.Sonoda, D.Suzuki, Y.X.Watanabe, K.Wimmer, H.Wollnik

Study of the N=32 and N=34 Shell Gap for Ti and V by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI

ATOMIC MASSES 55Sc, 56,58Ti, 56,57,58,59V; measured TOF; deduced masses, nonexistence of the N=34 empirical two-neutron shell gaps for Ti and V, and the enhanced energy gap in Ca. Comparison with new Monte Carlo shell model calculations. RIKEN's Radioactive Isotope Beam Factory (RIBF).

doi: 10.1103/PhysRevLett.130.012501
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2023PE06      Phys.Rev. C 107, 044301 (2023)

L.G.Pedersen, E.Sahin, A.Gorgen, F.L.Bello Garrote, Y.Tsunoda, T.Otsuka, M.Niikura, S.Nishimura, Z.Xu, H.Baba, G.Benzoni, F.Browne, A.M.Bruce, S.Ceruti, F.C.L.Crespi, R.Daido, G.de Angelis, M.-C.Delattre, Zs.Dombradi, P.Doornenbal, Y.Fang, S.Franchoo, G.Gey, A.Gottardo, T.Isobe, P.R.John, H.S.Jung, I.Kojouharov, T.Kubo, N.Kurz, I.Kuti, Z.Li, G.Lorusso, I.Matea, K.Matsui, D.Mengoni, T.Miyazaki, V.Modamio, S.Momiyama, A.I.Morales, P.Morfouace, D.R.Napoli, F.Naqvi, H.Nishibata, A.Odahara, R.Orlandi, Z.Patel, S.Rice, H.Sakurai, H.Schaffner, L.Sinclair, P.-A.Soderstrom, D.Sohler, I.G.Stefan, T.Sumikama, D.Suzuki, R.Taniuchi, J.Taprogge, Z.Vajta, J.J.Valiente-Dobon, H.Watanabe, V.Werner, J.Wu, A.Yagi, M.Yalcinkaya, R.Yokoyama, K.Yoshinaga

First spectroscopic study of odd-odd 78Cu

RADIOACTIVITY 78Ni(β-)[from 9Be(238U, X), E=345 MeV/nucleon]; measured Eγ, Iγ, βγ-coin, γγ-coin; deduced β-feeding, γ-transition intensities. 78Cu; deduced levels J, π, T1/2 of isomer state. Comparison with Monte Carlo shell model (MCSM) calculations. Wide-range active silicon-strip stopper array for beta and ion detection (WAS3ABi) with EURICA HPGe cluster det ector array at RIBF (RIKEN).

NUCLEAR STRUCTURE 78Cu; calculated levels, J, π, occupation numbers of proton and neutron orbitals, excitation energies of the negative-parity multiplets, configurations. Monte Carlo shell model calculations performed using A3DA-m interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.107.044301
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2023TS05      Phys.Rev. C 108, L021302 (2023)

Y.Tsunoda, N.Shimizu, T.Otsuka

Shape transition of Nd and Sm isotopes and the neutrinoless double-β-decay nuclear matrix element of 150Nd

NUCLEAR STRUCTURE 142,144,146,148,150,152,154Nd, 144,146,148,150,152,154,156Sm; calculated levels, J, π, B(E2), quadrupole moment, potential energy surfaces. Quasiparticle vacua shell model. Comparison to experimental data.

RADIOACTIVITY 150Nd(2β-); calculated nuclear matrix element for 0nββ-decay with with various short-range correlations, Jπ decomposition of nuclear matrix element.

doi: 10.1103/PhysRevC.108.L021302
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2022LI54      Phys.Rev. C 106, 044313 (2022)

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

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

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

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

doi: 10.1103/PhysRevC.106.044313
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2022OT01      Phys.Rev. C 105, 014319 (2022)

T.Otsuka, N.Shimizu, Y.Tsunoda

Moments and radii of exotic Na and Mg isotopes

NUCLEAR STRUCTURE 21,23,25,27,29,31,33,35,37,39,41Na; calculated magnetic dipole and spectroscopic electric quadrupole moments of ground states. 21,23,25,27,29,31,33,35,37,39,41Na, 24,26,28,30,32,34,36,38,40,42,44Mg; calculated charge and matter rms radii. 27,31,39,41Na, 28,32,42,44Mg; calculated T plot contours in (Q0, Q2) plane, β2 values. Shell-model calculations with an ab initio effective nucleon-nucleon interaction reported by 2020Ts03: Nature 587, 66 (2020). Comparison with experimental data.

doi: 10.1103/PhysRevC.105.014319
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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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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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2021SH24      Phys.Rev. C 103, 064302 (2021)

N.Shimizu, T.Mizusaki, K.Kaneko, Y.Tsunoda

Generator-coordinate methods with symmetry-restored Hartree-Fock-Bogoliubov wave functions for large-scale shell-model calculations

NUCLEAR STRUCTURE 48Ca, 56Ni, 132,133Ba; calculated levels, J, π, B(E2), quadrupole moments, and total energy surface contours in (Q0, Q2) plane using generator HFB-based coordinate method (GCM) combined with the projection method for large-scale shell model calculations. Benchmark tests of the axial HF+GCM, HF+GCM, axial HFB+GCM, and HFB+GCM methods for 48Ca and 132Ba. Possible relevance to proton-neutron mixing of the quasiparticle vacuum for precise estimation of nuclear matrix element (NMEs) for neutrinoless double-β decay.

doi: 10.1103/PhysRevC.103.064302
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2021TS02      Phys.Rev. C 103, L021303 (2021)

Yu.Tsunoda, T.Otsuka

Triaxial rigidity of 166Er and its Bohr-model realization

NUCLEAR STRUCTURE 166Er; calculated energies and B(E2) of positive-parity low-spin levels up to 4+ using Monte Carlo shell model (MCSM), constrained Hartree-Fock with angular-momentum and parity projections after variation (CHF), and Bohr Hamiltonian with a square-well potential or a rigid triaxiality. Comparison with experimental data. Low-lying levels interpreted in terms of rigid triaxiality.

doi: 10.1103/PhysRevC.103.L021303
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2020BE24      Phys.Rev. C 102, 034314 (2020)

F.L.Bello Garrote, E.Sahin, Y.Tsunoda, T.Otsuka, A.Gorgen, M.Niikura, S.Nishimura, G.de Angelis, G.Benzoni, A.I.Morales, V.Modamio, Z.Y.Xu, H.Baba, F.Browne, A.M.Bruce, S.Ceruti, F.C.L.Crespi, R.Daido, M.-C.Delattre, P.Doornenbal, Zs.Dombradi, Y.Fang, S.Franchoo, G.Gey, A.Gottardo, K.Hadynska-Klek, T.Isobe, P.R.John, H.S.Jung, I.Kojouharov, T.Kubo, N.Kurz, I.Kuti, Z.Li, G.Lorusso, I.Matea, K.Matsui, D.Mengoni, T.Miyazaki, S.Momiyama, P.Morfouace, D.R.Napoli, F.Naqvi, H.Nishibata, A.Odahara, R.Orlandi, Z.Patel, S.Rice, H.Sakurai, H.Schaffner, L.Sinclair, P.-A.Soderstrom, D.Sohler, I.G.Stefan, T.Sumikama, D.Suzuki, R.Taniuchi, J.Taprogge, Zs.Vajta, J.J.Valiente-Dobon, H.Watanabe, V.Werner, J.Wu, A.Yagi, M.Yalcinkaya, R.Yokoyama, K.Yoshinaga

β-decay of 75Ni and the systematics of the low-lying level structure of neutron-rich odd-A Cu isotopes

RADIOACTIVITY 75Ni(β-), (β-n)[from 9Be(238U, F), E=345 MeV/nucleon, followed by mass separation and identification of fragments of interest using the BigRIPS separator and ZeroDegree spectrometer, and implanted in WAS3ABi stopper at RIBF-RIKEN facility]; measured Eβ, Eγ, Iγ, γγ-coin, (implants)β-correlations, (implants)βγ-coin using the EURICA array for γ detection, half-life and %β-n or Pn for the decay of 75Ni. 75Cu; deduced levels, J, π, Iβ, logft values. Comparison with Monte Carlo shell model (MCSM) calculations. 74Cu, 75,76,77,78Zn, 76,80,81Ga, 80,81Ge(β-); observed γ rays in spectral Fig. 1.

NUCLEAR STRUCTURE 75Cu; calculated levels, J, π. 75,77Cu; calculated occupation numbers of proton and neutron orbits, potential energy surfaces for different spin states. 69,71,73,75,77,79Cu; systematics of energies of the first 1/2- states and corresponding B(E2) values, energies and decay sequences of particle-core coupling states, intruder states. Monte Carlo shell model calculations were performed using the A3DA interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.102.034314
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2020HO03      Phys.Lett. B 802, 135200 (2020)

C.Hornung, D.Amanbayev, I.Dedes, G.Kripko-Koncz, I.Miskun, N.Shimizu, S.Ayet S.Andres, J.Bergmann, T.Dickel, J.Dudek, J.Ebert, H.Geissel, M.Gorska, H.Grawe, F.Greiner, E.Haettner, T.Otsuka, W.R.Plass, S.Purushothaman, A.-Ka.Rink, C.Scheidenberger, H.Weick, S.Bagchi, A.Blazhev, O.Charviakova, D.Curien, A.Finlay, S.Kaur, W.Lippert, J.-H.Otto, Z.Patyk, S.Pietri, Y.K.Tanaka, Y.Tsunoda, J.S.Winfield

Isomer studies in the vicinity of the doubly-magic nucleus 100Sn: Observation of a new low-lying isomeric state in 97Ag

RADIOACTIVITY 97Ag, 101,103,105,107,109In(IT) [from 9Be(124Xe, X), E=600 MeV/nucleon]; measured decay products, mass-to-charge spectra; deduced mass excess, excitation energies. Comparison with shell model calculations.

doi: 10.1016/j.physletb.2020.135200
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2020LE05      Acta Phys.Pol. B51, 807 (2020)

S.Leoni, B.Fornal, N.Marginean, C.Michelagnoli, J.Wilson, M.Sferrazza, Y.Tsunoda, T.Otsuka

Shape-coexistence Studies in the Ni Isotopic Chain by Using the Selectivity of Different Reaction Mechanisms

doi: 10.5506/APhysPolB.51.807
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2020MA37      Phys.Rev.Lett. 125, 102502 (2020)

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

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

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

doi: 10.1103/PhysRevLett.125.102502
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2020PO12      Phys.Rev. C 102, 064310 (2020)

C.Porzio, C.Michelagnoli, N.Cieplicka-Orynczak, M.Sferrazza, S.Leoni, B.Fornal, Y.Tsunoda, T.Otsuka, S.Bottoni, C.Costache, F.C.L.Crespi, L.W.Iskra, M.Jentschel, F.Kandzia, Y.-H.Kim, U.Koster, N.Marginean, C.Mihai, P.Mutti, A.Turturica

Detailed low-spin spectroscopy of 65Ni via neutron capture reaction

NUCLEAR REACTIONS 64Ni(n, γ), E=thermal; measured Eγ, Iγ, γγ-coin, γγ(θ) using FIPPS array of eight HPGe clovers at ILL, Grenoble. 65Ni; deduced levels, J, π, multipolarities, mixing ratios; calculated potential-energy surfaces of 65Ni in (Q0, Q2) plane for different excited states. Comparison with Monte Carlo shell-model (MCSM) calculations, predicting spherical shapes for most states, with the exception of first 9/2+ and second 1/2- states of oblate deformation.

doi: 10.1103/PhysRevC.102.064310
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2020SO26      Commun. Phys. 11, 3242 (2020)

P.-A.Soderstrom, L.Capponi, E.Aciksoz, T.Otsuka, N.Tsoneva, Y.Tsunoda, D.L.Balabanski, N.Pietralla, G.L.Guardo, D.Lattuada, H.Lenske, C.Matei, D.Nichita, A.Pappalardo, T.Petruse

Electromagnetic character of the competitive γγ/γ-decay from 137mBa

RADIOACTIVITY 137Cs(β-), 137Ba(IT); measured decay products, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies, widths and nuclear static dipole polarisabilities, angular correlation of the two photons emitted in the double-γ decay, Energy-sharing distribution for the two photons in the double-γ decay, an improved value on the double-photon versus single-photon branching ratio. Comparison with calculations. CeBr3 detectors from ELIGANT, the ELI Gamma Above Neutron Threshold (ELIGANT) detector system.

doi: 10.1038/s41467-020-16787-4
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2019FL06      Phys.Rev. C 99, 054332 (2019)

F.Flavigny, J.Elseviers, A.N.Andreyev, C.Bauer, V.Bildstein, A.Blazhev, B.A.Brown, H.De Witte, J.Diriken, V.N.Fedosseev, S.Franchoo, R.Gernhauser, M.Huyse, S.Ilieva, S.Klupp, Th.Kroll, R.Lutter, B.A.Marsh, D.Mucher, K.Nowak, T.Otsuka, J.Pakarinen, N.Patronis, R.Raabe, F.Recchia, P.Reiter, T.Roger, S.Sambi, M.Seidlitz, M.D.Seliverstov, B.Siebeck, Y.Tsunoda, P.Van Duppen, M.Vermeulen, M.Von Schmid, D.Voulot, N.Warr, F.Wenander, K.Wimmer

Microscopic structure of coexisting 0+ states in 68Ni probed via two-neutron transfer

NUCLEAR REACTIONS 3H(66Ni, p)68Ni, E=2.6 MeV/nucleon; measured Ep, Ip, Eγ, Iγ, pγ-coin, differential σ(θ) distributions of transfer to ground state, first excited 0+ and first 2+ states in 68Ni using the T-REX silicon particle detector array for light charged recoil detection and the Miniball detector array for γ detection at ISOLDE-CERN. 68Ni; deduced levels, L-transfer, neutron and proton average orbital occupancies of ground state, excited 0+ state, and the first 2+ state. DWBA analysis of angular distributions using the FRESCO code. Comparison with shell model calculations with the A3DA-m and the JJ44pna interaction. Discussed feeding of the 0+ states by the transfer of neutrons mainly filling the N=40 subshell closure for the ground state.

doi: 10.1103/PhysRevC.99.054332
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2019IC02      Nat.Phys. 15, 321 (2019)

Y.Ichikawa, H.Nishibata, Y.Tsunoda, A.Takamine, K.Imamura, T.Fujita, T.Sato, S.Momiyama, Y.Shimizu, D.S.Ahn, K.Asahi, H.Baba, D.L.Balabanski, F.Boulay, J.M.Daugas, T.Egami, N.Fukuda, C.Funayama, T.Furukawa, G.Georgiev, A.Gladkov, N.Inabe, Y.Ishibashi, T.Kawaguchi, T.Kawamura, Y.Kobayashi, S.Kojima, A.Kusoglu, I.Mukul, M.Niikura, T.Nishizaka, A.Odahara, Y.Ohtomo, T.Otsuka, D.Ralet, G.S.Simpson, T.Sumikama, H.Suzuki, H.Takeda, L.C.Tao, Y.Togano, D.Tominaga, H.Ueno, H.Yamazaki, X.F.Yang

Interplay between nuclear shell evolution and shape deformation revealed by the magnetic moment of 75Cu

NUCLEAR REACTIONS 27Al(76Zn, p)75Cu, E<345 MeV/nucleon; 9Be(238U, X)76Zn, E= 345 MeV/nucleon; measured reaction products, Eγ, Iγ. 75Cu; deduced γ-ray energies, J, π, nuclear magnetic moment. Comparison with theoretical calculations, systematics.

doi: 10.1038/s41567-018-0410-7
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2019IS03      Phys.Lett. B 788, 396 (2019)

L.W.Iskra, R.Broda, R.V.F.Janssens, M.P.Carpenter, B.Fornal, T.Lauritsen, T.Otsuka, T.Togashi, Y.Tsunoda, W.B.Walters, S.Zhu

Revised B(E3) transition rate and structure of the 3 - level in 96Zr

NUCLEAR STRUCTURE 96Zr; analyzed available data; deduced reduced value of B(E3) compared to the previous reports; calculated the collectivity of the octupole vibration arises from both proton and neutron excitations involving a large number of orbitals using the Monte Carlo shell-model.

NUCLEAR REACTIONS 238U(76Ge, X), (64Ni, X), (48Ca, X), (208Pb, X)96Zr, 208Pb, 198Pt(76Ge, X)96Zr, E not given; measured reaction products, Eγ, Iγ; deduced γ-ray relative intensities, B(E3), branching ratios.

doi: 10.1016/j.physletb.2018.10.069
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2019LE24      Acta Phys.Pol. B50, 605 (2019)

S.Leoni, B.Fornal, N.Marginean, M.Sferrazza, Y.Tsunoda, T.Otsuka

Shape Coexistence and Shape Isomerism in the Ni Isotopic Chain

NUCLEAR REACTIONS 64Ni(18O, 16O), E=39 MeV;62,60Ni(18O, 16O), E=39 MeV; 63,65Cu(11B, 12C), E=26 MeV; measured Eγ, Iγ; 66Ni, 64Ni, 62Ni; deduced levels, J, π, transition strengths, T1/2. Comparison to Monte Carlo Shell Model calculations. ROSPHERE and Nu-BALL detectors.

doi: 10.5506/aphyspolb.50.605
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2019OT01      Phys.Rev.Lett. 123, 222502 (2019)

T.Otsuka, Y.Tsunoda, T.Abe, N.Shimizu, P.Van Duppen

Underlying Structure of Collective Bands and Self-Organization in Quantum Systems

NUCLEAR STRUCTURE 154Sm, 166Er; calculated energy levels, J, π, spectroscopic electric quadrupole moments; deduced formation of collective bands.

doi: 10.1103/PhysRevLett.123.222502
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2019SE04      Phys.Rev. C 99, 044306 (2019)

S.Sels, T.Day Goodacre, B.A.Marsh, A.Pastore, W.Ryssens, Y.Tsunoda, N.Althubiti, B.Andel, A.N.Andreyev, D.Atanasov, A.E.Barzakh, M.Bender, J.Billowes, K.Blaum, T.E.Cocolios, J.G.Cubiss, J.Dobaczewski, G.J.Farooq-Smith, D.V.Fedorov, V.N.Fedosseev, K.T.Flanagan, L.P.Gaffney, L.Ghys, P.-H.Heenen, M.Huyse, S.Kreim, D.Lunney, K.M.Lynch, V.Manea, Y.Martinez Palenzuela, T.M.Medonca, P.L.Molkanov, T.Otsuka, J.P.Ramos, R.E.Rossel, S.Rothe, L.Schweikhard, M.D.Seliverstov, P.Spagnoletti, C.Van Beveren, P.Van Duppen, M.Veinhard, E.Verstraelen, A.Welker, K.Wendt, F.Wienholtz, R.N.Wolf, A.Zadvornaya

Shape staggering of midshell mercury isotopes from in-source laser spectroscopy compared with density-functional-theory and Monte Carlo shell-model calculations

NUCLEAR MOMENTS 177,178,179,180,181,182,183,184,185,185mHg; measured hyperfine structure (hfs) spectra, hyperfine coupling constants, isotope shifts, and rms charge radii using the in-source resonance-ionization spectroscopy method combined with decay spectroscopy, and Multi-Reflection Time-of-Flight Mass Spectrometer (MR-TOF MS) at CERN-ISOLDE facility; deduced magnetic dipole moments, and spectroscopic quadrupole moments, configurations. Comparison with theoretical calculations using density functional theory (DFT) with Skyrme parametrizations, and Monte Carlo shell model (MCSM). Ions of Hg activities produced in Pb(p, X), E=1.4 GeV, using molten lead target.

NUCLEAR REACTIONS Pb, U(p, X)177Hg/178Hg/179Hg/180Hg/181Hg/182Hg/183Hg/184Hg/185Hg/185mHg, E=1.4 GeV from PS-Booster synchrotron; measured production yields for different target-ion source configurations: VADLIS or RILIS at CERN-ISOLDE facility.

doi: 10.1103/PhysRevC.99.044306
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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.PĂ©ron, 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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2019XI07      Phys.Lett. B 797, 134805 (2019)

L.Xie, X.F.Yang, C.Wraith, C.Babcock, J.Bieron, J.Billowes, M.L.Bissell, K.Blaum, B.Cheal, L.Filippin, K.T.Flanagan, R.F.Garcia Ruiz, W.Gins, G.Gaigalas, M.Godefroid, C.Gorges, L.K.Grob, H.Heylen, P.Jonsson, S.Kaufmann, M.Kowalska, J.Kramer, S.Malbrunot-Ettenauer, R.Neugart, G.Neyens, W.Nortershauser, T.Otsuka, J.Papuga, R.Sanchez, Y.Tsunoda, D.T.Yordanov

Nuclear charge radii of 62-80Zn and their dependence on cross-shell proton excitations

NUCLEAR MOMENTS 62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80Zn; measured frequencies; deduced isotope shifts, mean square charge radii.

doi: 10.1016/j.physletb.2019.134805
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2018MO33      Phys.Lett. B 781, 706 (2018)

A.I.Morales, G.Benzoni, H.Watanabe, G.de Angelis, S.Nishimura, L.Coraggio, A.Gargano, N.Itaco, T.Otsuka, Y.Tsunoda, P.Van Isacker, F.Browne, R.Daido, P.Doornenbal, Y.Fang, G.Lorusso, Z.Patel, S.Rice, L.Sinclair, P.-A.Soderstrom, T.Sumikama, J.J.Valiente-Dobon, J.Wu, Z.Y.Xu, A.Yagi, R.Yokoyama, H.Baba, R.Avigo, F.L.Bello Garrote, N.Blasi, A.Bracco, A.M.Bruce, F.Camera, S.Ceruti, F.C.L.Crespi, M.-C.Delattre, Zs.Dombradi, A.Gottardo, T.Isobe, I.Kojouharov, N.Kurz, I.Kuti, S.Lalkovski, K.Matsui, B.Melon, D.Mengoni, T.Miyazaki, V.Modamio-Hoybjor, S.Momiyama, D.R.Napoli, M.Niikura, R.Orlandi, Zs.Podolyak, P.H.Regan, H.Sakurai, E.Sahin, D.Sohler, H.Schaffner, R.Taniuchi, J.Taprogge, Zs.Vajta, O.Wieland, M.Yalcinkaya

Is seniority a partial dynamic symmetry in the first νg9/2 shell?

RADIOACTIVITY 72,74Co(β-) [from 9Be(238U, X), E=345 MeV/nucleon]; measured reaction products, Eγ, Iγ; deduced γ-ray energies, levels, isomeric states, seniority scheme, B(E2), the disappearance of the seniority isomerism. Comparison with available data. The MCSM calculations. The first in-flight β-delayed fast-timing study. The RIBF facility in RIKEN within the EURICA collaboration.

doi: 10.1016/j.physletb.2018.04.049
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2018SI26      Phys.Rev.Lett. 121, 192501 (2018)

P.Singh, W.Korten, T.W.Hagen, A.Gorgen, L.Grente, M.-D.Salsac, F.Farget, E.Clement, G.de France, T.Braunroth, B.Bruyneel, I.Celikovic, O.Delaune, A.Dewald, A.Dijon, J.-P.Delaroche, M.Girod, M.Hackstein, B.Jacquot, J.Libert, J.Litzinger, J.Ljungvall, C.Louchart, A.Gottardo, C.Michelagnoli, C.Muller-Gatermann, D.R.Napoli, T.Otsuka, N.Pillet, F.Recchia, W.Rother, E.Sahin, S.Siem, B.Sulignano, T.Togashi, Y.Tsunoda, Ch.Theisen, J.J.Valiente-Dobon

Evidence for Coexisting Shapes through Lifetime Measurements in 98Zr

NUCLEAR REACTIONS 9Be(238U, X)98Zr, E=6.2 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced level lifetimes, B(E2) values. Comparison with available data. Recoil-distance Doppler shift method.

doi: 10.1103/PhysRevLett.121.192501
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2018ST18      Phys.Rev. C 98, 064326 (2018)

M.Stryjczyk, Y.Tsunoda, I.G.Darby, H.De Witte, J.Diriken, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, M.Huyse, U.Koster, B.A.Marsh, T.Otsuka, D.Pauwels, L.Popescu, D.Radulov, M.D.Seliverstov, A.M.Sjodin, P.Van den Bergh, P.Van Duppen, M.Venhart, W.B.Walters, K.Wimmer

β-decay study of the 66Mn - 66Fe - 66Co - 66Ni decay chain

RADIOACTIVITY 66Mn(β-), (β-n)[from U(p, F), Mn beam purified by laser resonance ionization and mass separation]; 66Fe(β-)[from 66Mn β- decay]; 66Co(β-)[from 66Fe β- decay]; measured Eβ, Iβ, Eγ, Iγ, half-lives of β-decaying 66Mn, 66Fe, 66Co, γγ- and βγγ-coin, half-lives of isomers in 65Fe, 66Co by γ(t) using plastic scintillators for β detection and MiniBall cluster Ge detectors for γ detection at ISOLDE-CERN. 65,66Fe, 66Co, 66Ni; deduced levels, isomers, J, π, β feedings, logft, B(GT) values, %β-n value for the decay of 66Mn. Comparison with Monte Carlo shell model calculations.

NUCLEAR STRUCTURE 66Mn, 66Fe, 66Co, 66Ni; calculated average proton and neutron occupation numbers for selected low-lying positive-parity states, potential energy surface (PES) in (Q0, Q2) plane, levels, J, π, B(M1), B(E2) using Monte Carlo Shell model with the A3DA interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.98.064326
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2018TO07      Phys.Rev.Lett. 121, 062501 (2018)

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

Novel Shape Evolution in Sn Isotopes from Magic Numbers 50 to 82

NUCLEAR STRUCTURE 100,104,108,112,116,120,124,128,132,136Sn; calculated energies, R4/2, B(E2), occupation numbers. Comparison with available data.

doi: 10.1103/PhysRevLett.121.062501
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2018YA11      Phys.Rev. C 97, 044324 (2018)

X.F.Yang, Y.Tsunoda, C.Babcock, J.Billowes, M.L.Bissell, K.Blaum, B.Cheal, K.T.Flanagan, R.F.Garcia Ruiz, W.Gins, C.Gorges, L.K.Grob, H.Heylen, S.Kaufmann, M.Kowalska, J.Kramer, S.Malbrunot-Ettenauer, R.Neugart, G.Neyens, W.Nortershauser, T.Otsuka, J.Papuga, R.Sanchez, C.Wraith, L.Xie, D.T.Yordanov

Investigating the large deformation of the 5/2+ isomeric state in 73Zn: An indicator for triaxiality

NUCLEAR MOMENTS 73,73mZn; measured hyperfine structure spectra using collinear laser spectroscopy (COLLAPS) at CERN-ISOLDE; deduced spins of ground state and isomer, estimated half-life of the isomer, and found no evidence for a previously proposed 5.6-s isomer. 73,73mZn produced by impinging UCx target by 1.4 GeV protons, and ionized by the resonant ionization laser-ion source (RILIS). 69m,71m,73m,75,77,79Zn; calculated quadrupole moments of ground states and isomers using shell model with JUN45 and A3DA-m interactions, and compared with experimental results from experiments at ISOLDE-CERN. Discussed collectivity in 73Zn.

NUCLEAR STRUCTURE 71,72,73,74,75Zn; calculated potential energy surfaces (PES) of high-spin states in 71,73,75Zn, and 0+, 2+, and 4+ states in 72,74Zn in (Q2, Q4) plane using Monte Carlo shell model (MCSM). 73Zn; calculated levels, J, π, T plots of levels in 73Zn, and compared with experimental data.

doi: 10.1103/PhysRevC.97.044324
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2017AN15      Phys.Rev. C 96, 054323 (2017)

S.Ansari, J.-M.Regis, J.Jolie, N.Saed-Samii, N.Warr, W.Korten, M.Zielinska, M.-D.Salsac, A.Blanc, M.Jentschel, U.Koster, P.Mutti, T.Soldner, G.S.Simpson, F.Drouet, A.Vancraeyenest, G.de France, E.Clement, O.Stezowski, C.A.Ur, W.Urban, P.H.Regan, Zs.Podolyak, C.Larijani, C.Townsley, R.Carroll, E.Wilson, H.Mach, L.M.Fraile, V.Paziy, B.Olaizola, V.Vedia, A.M.Bruce, O.J.Roberts, J.F.Smith, M.Scheck, T.Kroll, A.-L.Hartig, A.Ignatov, S.Ilieva, S.Lalkovski, N.Marginean, T.Otsuka, N.Shimizu, T.Togashi, Y.Tsunoda

Experimental study of the lifetime and phase transition in neutron-rich 98, 100, 102Zr

NUCLEAR REACTIONS 235U(n, F), 241Pu(n, F), E=cold neutrons beam from PF1B, Institut Laue-Langevin (ILL), Grenoble; measured Eγ, γγ-coin, half-lives of the first 2+, 4+ and 6+ levels by fast-timing technique using the EXILL-FATIMA array consisting of eight EXOGAM clovers and 16 LaBr3(Ce) scintillators; fast-timing coincidence events analyzed using method of mirror symmetric centroid difference (MSCD) and generalized centroid difference method (GCDM). 98,100,102Zr; deduced levels, B(E2). Comparison with Interacting Boson model and Monte-Carlo shell-model calculations, and with previous experimental results. Systematics of B(E2) values for the first 2+, 4+ and 6+ states in 96,98,100,102,104,106Zr.

doi: 10.1103/PhysRevC.96.054323
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2017BO23      Phys.Lett. B 775, 271 (2017)

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

Nucleon correlations and the structure of 7130Zn41

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

doi: 10.1016/j.physletb.2017.11.003
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2017DE30      Phys.Rev. C 96, 041302 (2017)

R.P.de Groote, J.Billowes, C.L.Binnersley, M.L.Bissell, T.E.Cocolios, T.Day Goodacre, G.J.Farooq-Smith, D.V.Fedorov, K.T.Flanagan, S.Franchoo, R.F.Garcia Ruiz, A.Koszorus, K.M.Lynch, G.Neyens, F.Nowacki, T.Otsuka, S.Rothe, H.H.Stroke, Y.Tsunoda, A.R.Vernon, K.D.A.Wendt, S.G.Wilkins, Z.Y.Xu, X.F.Yang

Dipole and quadrupole moments of 73-78Cu as a test of the robustness of the Z = 28 shell closure near 78Ni

NUCLEAR MOMENTS 73,74,75,76,77,78Cu; measured hyperfine spectra using Collinear Resonance Ionization Spectroscopy (CRIS) at CERN-ISOLDE facility; deduced hyperfine A and B parameters, magnetic dipole moments, electric quadrupole moments for the ground states, spins of 76,77Cu ground states. Comparison with large-scale shell-model calculations using A3DA-m and PFSDG-U interactions. The Cu isotopes produced in U(p, F), E=1.4 GeV reaction followed by laser ionization using the resonant ionization laser ion source (RILIS), and mass separation using the high-resolution separator.

doi: 10.1103/PhysRevC.96.041302
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2017LE06      Phys.Rev.Lett. 118, 162502 (2017)

S.Leoni, B.Fornal, N.Marginean, M.Sferrazza, Y.Tsunoda, T.Otsuka, G.Bocchi, F.C.L.Crespi, A.Bracco, S.Aydin, M.Boromiza, D.Bucurescu, N.Cieplicka-Orynczak, C.Costache, S.Calinescu, N.Florea, D.G.Ghita, T.Glodariu, A.Ionescu, L.W.Iskra, M.Krzysiek, R.Marginean, C.Mihai, R.E.Mihai, A.Mitu, A.Negret, C.R.Nita, A.Olacel, A.Oprea, S.Pascu, P.Petkov, C.Petrone, G.Porzio, A.Serban, C.Sotty, L.Stan, I.Stiru, L.Stroe, R.Suvaila, S.Toma, A.Turturica, S.Ujeniuc, C.A.Ur

Multifaceted Quadruplet of Low-Lying Spin-Zero States in 66Ni: Emergence of Shape Isomerism in Light Nuclei

NUCLEAR REACTIONS 64Ni(18O, X)66Ni, E=39 MeV; measured reaction products, Eγ, Iγ, γ-γ-coin.; deduced lifetimes, B(E2), J, π. Plunger technique, comparison with the state-of-the-art Monte Carlo shell model calculations.

doi: 10.1103/PhysRevLett.118.162502
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2017MO02      Phys.Lett. B 765, 328 (2017)

A.I.Morales, G.Benzoni, H.Watanabe, Y.Tsunoda, T.Otsuka, S.Nishimura, F.Browne, R.Daido, P.Doornenbal, Y.Fang, G.Lorusso, Z.Patel, S.Rice, L.Sinclair, P.-A.Soderstrom, T.Sumikama, J.Wu, Z.Y.Xu, A.Yagi, R.Yokoyama, H.Baba, R.Avigo, F.L.Bello Garrote, N.Blasi, A.Bracco, F.Camera, S.Ceruti, F.C.L.Crespi, G.de Angelis, M.-C.Delattre, Zs.Dombradi, A.Gottardo, T.Isobe, I.Kojouharov, N.Kurz, I.Kuti, K.Matsui, B.Melon, D.Mengoni, T.Miyazaki, V.Modamio-Hoybjor, S.Momiyama, D.R.Napoli, M.Niikura, R.Orlandi, H.Sakurai, E.Sahin, D.Sohler, H.Schaffner, R.Taniuchi, J.Taprogge, Zs.Vajta, J.J.Valiente-Dobon, O.Wieland, M.Yalcinkaya

Type II shell evolution in A = 70 isobars from the N ≥ 40 island of inversion

RADIOACTIVITY 70Fe, 70Co(β-); measured decay products, Eγ, Iγ; deduced γ-ray energies and intensities, β-feeding, log ft, B(GT). Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2016.12.025
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2017OL07      Phys.Rev.Lett. 119, 192501 (2017)

L.Olivier, S.Franchoo, M.Niikura, Z.Vajta, D.Sohler, P.Doornenbal, A.Obertelli, Y.Tsunoda, T.Otsuka, G.Authelet, H.Baba, D.Calvet, F.Chateau, A.Corsi, A.Delbart, J.-M.Gheller, A.Gillibert, T.Isobe, V.Lapoux, M.Matsushita, S.Momiyama, T.Motobayashi, H.Otsu, C.Peron, A.Peyaud, E.C.Pollacco, J.-Y.Rousse, H.Sakurai, C.Santamaria, M.Sasano, Y.Shiga, S.Takeuchi, R.Taniuchi, T.Uesaka, H.Wang, K.Yoneda, F.Browne, L.X.Chung, Z.Dombradi, F.Flavigny, 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, K.Ogata, S.Ota, Z.Patel, E.Sahin, C.Shand, P.-A.Soderstrom, I.Stefan, D.Steppenbeck, T.Sumikama, D.Suzuki, V.Werner, J.Wu, Z.Xu

Persistence of the Z=28 Shell Gap Around 78Ni: First Spectroscopy of 79Cu

NUCLEAR REACTIONS 1H(80Zn, p)79Cu, E=270 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies and intensities, occupation numbers, systematics. Comparison with Monte Carlo shell-model calculations.

doi: 10.1103/PhysRevLett.119.192501
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2017PA01      Phys.Rev.Lett. 118, 032501 (2017)

N.Paul, A.Corsi, A.Obertelli, P.Doornenbal, G.Authelet, H.Baba, B.Bally, M.Bender, D.Calvet, F.Chateau, S.Chen, J.-P.Delaroche, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, M.Girod, P.-H.Heenen, V.Lapoux, J.Libert, T.Motobayashi, M.Niikura, T.Otsuka, T.R.Rodriguez, J.-Y.Rousse, H.Sakurai, C.Santamaria, N.Shimizu, D.Steppenbeck, R.Taniuchi, T.Togashi, Y.Tsunoda, T.Uesaka, T.Ando, T.Arici, A.Blazhev, F.Browne, A.M.Bruce, R.Carroll, L.X.Chung, M.L.Cortes, M.Dewald, B.Ding, F.Flavigny, S.Franchoo, M.Gorska, A.Gottardo, A.Jungclaus, J.Lee, M.Lettmann, B.D.Linh, J.Liu, Z.Liu, C.Lizarazo, S.Momiyama, K.Moschner, S.Nagamine, N.Nakatsuka, C.Nita, C.R.Nobs, L.Olivier, Z.Patel, Z.Podolyak, M.Rudigier, T.Saito, C.Shand, P.-A.Soderstrom, I.Stefan, R.Orlandi, V.Vaquero, V.Werner, K.Wimmer, Z.Xu

Are There Signatures of Harmonic Oscillator Shells Far from Stability? First Spectroscopy of 110Zr

NUCLEAR REACTIONS H(113Tc, p)112Mo, (111Nb, p)110Zr, E=260 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced 2+ state energies, R4/2 energy ratio. Comparison with Monte Carlo shell model predictions.

doi: 10.1103/PhysRevLett.118.032501
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2017RE05      Phys.Rev. C 95, 054319 (2017); Erratum Phys.Rev. C 95, 069902 (2017)

J.-M.Regis, J.Jolie, N.Saed-Samii, N.Warr, M.Pfeiffer, A.Blanc, M.Jentschel, U.Koster, P.Mutti, T.Soldner, G.S.Simpson, F.Drouet, A.Vancraeyenest, G.de France, E.Clement, O.Stezowski, C.A.Ur, W.Urban, P.H.Regan, Zs.Podolyak, C.Larijani, C.Townsley, R.Carroll, E.Wilson, L.M.Fraile, H.Mach, V.Paziy, B.Olaizola, V.Vedia, A.M.Bruce, O.J.Roberts, J.F.Smith, M.Scheck, T.Kroll, A.-L.Hartig, A.Ignatov, S.Ilieva, S.Lalkovski, W.Korten, N.Marginean, T.Otsuka, N.Shimizu, T.Togashi, Y.Tsunoda

Abrupt shape transition at neutron number N=60: B(E2) values in 94, 96, 98Sr from fast γ - γ timing

NUCLEAR REACTIONS 235U(n, Fγ), E=cold neutron beam; measured Eγ, Iγ, level half-lives by fast-timing γγ(t) method using EXILL and FATIMA spectrometer at ILL-Grenoble reactor facility. 94,96,98Sr; deduced levels, B(E2)values. Comparison with previous experimental values, and with Monte Carlo Shell-model calculations.

doi: 10.1103/PhysRevC.95.054319
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2017SA32      Phys.Rev.Lett. 118, 242502 (2017)

E.Sahin, F.L.Bello Garrote, Y.Tsunoda, T.Otsuka, G.de Angelis, A.Gorgen, M.Niikura, S.Nishimura, Z.Y.Xu, H.Baba, F.Browne, M.-C.Delattre, P.Doornenbal, S.Franchoo, G.Gey, K.Hadynska-Klek, T.Isobe, P.R.John, H.S.Jung, I.Kojouharov, T.Kubo, N.Kurz, Z.Li, G.Lorusso, I.Matea, K.Matsui, D.Mengoni, P.Morfouace, D.R.Napoli, F.Naqvi, H.Nishibata, A.Odahara, H.Sakurai, H.Schaffner, P.-A.Soderstrom, D.Sohler, I.G.Stefan, T.Sumikama, D.Suzuki, R.Taniuchi, J.Taprogge, Z.Vajta, H.Watanabe, V.Werner, J.Wu, A.Yagi, M.Yalcinkaya, K.Yoshinaga

Shell Evolution towards 78Ni : Low-Lying States in 77Cu

RADIOACTIVITY 77Ni(β-) [from 9Be(238U, X), E=345 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced γ-ray energies and intensities, J, π. Comparison with large-scale Monte Carlo shell model calculations.

doi: 10.1103/physrevlett.118.242502
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2017SH42      Phys.Lett. B 773, 492 (2017)

C.M.Shand, Zs.Podolyak, M.Gorska, P.Doornenbal, A.Obertelli, F.Nowacki, T.Otsuka, K.Sieja, J.A.Tostevin, Y.Tsunoda, G.Authelet, H.Baba, D.Calvet, A.Chateau, S.Chen, A.Corsi, A.Delbart, J.M.Gheller, A.Giganon, A.Gillibert, T.Isobe, V.Lapoux, M.Matsushita, S.Momiyama, T.Motobayashi, M.Niikura, H.Otsu, N.Paul, C.Peron, A.Peyaud, E.C.Pollacco, J.-Y.Rousse, H.Sakurai, C.Santamaria, M.Sasano, Y.Shiga, D.Steppenbeck, S.Takeuchi, R.Taniuchi, T.Uesaka, H.Wang, K.Yoneda, T.Ando, T.Arici, A.Blazhev, F.Browne, A.M.Bruce, R.J.Carroll, L.X.Chung, M.L.Cortes, M.Dewald, B.Ding, Zs.Dombradi, F.Flavigny, S.Franchoo, F.Giacoppo, A.Gottardo, K.Hadynska-Klek, A.Jungclaus, Z.Korkulu, S.Koyama, Y.Kubota, J.Lee, M.Lettmann, B.D.Linh, J.Liu, Z.Liu, C.Lizarazo, C.Louchart, R.Lozeva, K.Matsui, T.Miyazaki, K.Moschner, M.Nagamine, N.Nakatsuka, S.Nishimura, C.R.Nita, C.R.Nobs, L.Olivier, S.Ota, R.Orlandi, Z.Patel, P.H.Regan, M.Rudigier, E.Sahin, T.Saito, P.-A.Soderstrom, I.Stefan, T.Sumikama, D.Suzuki, Zs.Vajta, V.Vaquero, V.Werner, K.Wimmer, J.Wu, Z.Y.Xu

Shell evolution beyond Z = 28 and N = 50: Spectroscopy of 81, 82, 83, 84Zn

NUCLEAR REACTIONS H(82Ga, 2p)81Zn, (83Ga, 2p)82Zn, (84Ga, X)82Zn, (86Ga, X)83Zn, (85Ga, X)84Zn, E ∼ 270 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π; Comparison with Ni78-II, A3DA-m and PFSDG-U calculations.

doi: 10.1016/j.physletb.2017.09.001
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2017WR01      Phys.Lett. B 771, 385 (2017)

C.Wraith, X.F.Yang, L.Xie, C.Babcock, J.Bieron, J.Billowes, M.L.Bissell, K.Blaum, B.Cheal, L.Filippin, R.F.Garcia Ruiz, W.Gins, L.K.Grob, G.Gaigalas, M.Godefroid, C.Gorges, H.Heylen, M.Honma, P.Jonsson, S.Kaufmann, M.Kowalska, J.Kramer, S.Malbrunot-Ettenauer, R.Neugart, G.Neyens, W.Nortershauser, F.Nowacki, T.Otsuka, J.Papuga, R.Sanchez, Y.Tsunoda, D.T.Yordanov

Evolution of nuclear structure in neutron-rich odd-Zn isotopes and isomers

NUCLEAR MOMENTS 63,65,67,69,71,73,75,77,79Zn; measured optical spectra; deduced hyperfine spectra (hfs) including isomeric structures, J of ground and isomeric states, hfs constants, nuclear magnetic dipole and quadrupole moments, g-factors and wave functions. Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2017.05.085
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2016BA44      Phys.Lett. B 760, 387 (2016)

C.Babcock, H.Heylen, M.L.Bissell, K.Blaum, P.Campbell, B.Cheal, D.Fedorov, R.F.Garcia Ruiz, W.Geithner, W.Gins, T.Day Goodacre, L.K.Grob, M.Kowalska, S.M.Lenzi, B.Maass, S.Malbrunot-Ettenauer, B.Marsh, R.Neugart, G.Neyens, W.Nortershauser, T.Otsuka, R.Rossel, S.Rothe, R.Sanchez, Y.Tsunoda, C.Wraith, L.Xie, X.F.Yang

Quadrupole moments of odd-A 53-63Mn: Onset of collectivity towards N = 40

NUCLEAR MOMENTS 53,55,57,59,61,63Mn; measured hyperfine spectra; deduced spectroscopic quadrupole moments. Comparison with large-scale shell model predictions using three effective interactions, GXPF1A, LNPS, modified A3DA.

doi: 10.1016/j.physletb.2016.07.016
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2016HE14      Phys.Rev. C 94, 054321 (2016)

H.Heylen, C.Babcock, R.Beerwerth, J.Billowes, M.L.Bissell, K.Blaum, J.Bonnard, P.Campbell, B.Cheal, T.Day Goodacre, D.Fedorov, S.Fritzsche, R.F.Garcia Ruiz, W.Geithner, Ch.Geppert, W.Gins, L.K.Grob, M.Kowalska, K.Kreim, S.M.Lenzi, I.D.Moore, B.Maass, S.Malbrunot-Ettenauer, B.Marsh, R.Neugart, G.Neyens, W.Nortershauser, T.Otsuka, J.Papuga, R.Rossel, S.Rothe, R.Sanchez, Y.Tsunoda, C.Wraith, L.Xie, X.F.Yang, D.T.Yordanov

Changes in nuclear structure along the Mn isotopic chain studied via charge radii

ATOMIC PHYSICS 51,53,54,55,56,57,58,59,60,61,62,63,64Mn; measured hyperfine spectra using collinear laser spectroscopy at ISOLDE-CERN; deduced charge radii. Isotopes produced in bombardment of uranium carbide target with 1.4-GeV proton beam. Mass and field shift factors calculated in multiconfiguration Dirac-Fock framework and combined with King plot analysis. Comparison with Duflo-Zuker formula.

NUCLEAR STRUCTURE 53,55,57,59,61,63,65Mn; calculated potential energy surfaces using Monte Carlo shell-model. Systematics of S(2n) values for Z=20-28, N=24-46 nuclei.

doi: 10.1103/PhysRevC.94.054321
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2016KR07      Phys.Rev.Lett. 117, 172503 (2016)

C.Kremer, S.Aslanidou, S.Bassauer, M.Hilcker, A.Krugmann, P.von Neumann-Cosel, T.Otsuka, N.Pietralla, V.Yu.Ponomarev, N.Shimizu, M.Singer, G.Steinhilber, T.Togashi, Y.Tsunoda, V.Werner, M.Zweidinger

First Measurement of Collectivity of Coexisting Shapes Based on Type II Shell Evolution: The Case of 96Zr

NUCLEAR REACTIONS 96Zr(E, E'), E=43 MeV; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, B(E2). Comparison with the shell-model calculations and a two-state model with and without mixing.

doi: 10.1103/PhysRevLett.117.172503
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2016OT01      J.Phys.(London) G43, 024009 (2016)

T.Otsuka, Y.Tsunoda

The role of shell evolution in shape coexistence

NUCLEAR STRUCTURE 68Ni; calculated probabilities of configurations, total energy surface, J, π.

doi: 10.1088/0954-3899/43/2/024009
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2016SH07      Phys.Rev. C 93, 024320 (2016)

Y.Shiga, K.Yoneda, D.Steppenbeck, N.Aoi, P.Doornenbal, J.Lee, H.Liu, M.Matsushita, S.Takeuchi, H.Wang, H.Baba, P.Bednarczyk, Zs.Dombradi, Zs.Fulop, S.Go, T.Hashimoto, M.Honma, E.Ideguchi, K.Ieki, K.Kobayashi, Y.Kondo, R.Minakata, T.Motobayashi, D.Nishimura, T.Otsuka, H.Otsu, H.Sakurai, N.Shimizu, D.Sohler, Y.Sun, A.Tamii, R.Tanaka, Z.Tian, Y.Tsunoda, Zs.Vajta, T.Yamamoto, X.Yang, Z.Yang, Y.Ye, R.Yokoyama, J.Zenihiro

Investigating nuclear shell structure in the vicinity of 78Ni: Low-lying excited states in the neutron-rich isotopes 80, 82Zn

NUCLEAR REACTIONS 9Be(80Zn, 80Zn'), (81Ga, 80Zn), (80Ga, 78Zn), (83Ge, 82Ge), (83As, 82Ge), E=250 MeV/nucleon, [secondary 80Zn, 80,81Ga, 82,83Ge, 83As and other beams from 9Be(238U, X), E=345 MeV/nucleon primary reaction]; measured yields of reaction products, Eγ, Iγ, Doppler corrected γ rays, γγ-coin, level half-lives by line-shape analysis using BigRIPS separator, ZeroDegree spectrometer for particle identification and detection, and DALI2 array of NaI(Tl) detectors for γ rays at RIBF-RIKEN facility. 76,78,80,82Zn, 82Ge; deduced levels, J, π, B(E2), configurations. Comparison with previous experimental results, and with calculations using Monte Carlo shell-model (MCSM) and shell-model with JUN45 interaction. Systematics of energies of first 2+ and 4+ states and E(4+/2+) ratios in 74,76,78,80,82Zn, 82Ge, 84Se, 86Kr.

doi: 10.1103/PhysRevC.93.024320
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2016TO15      Phys.Rev.Lett. 117, 172502 (2016)

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

Quantum Phase Transition in the Shape of Zr isotopes

NUCLEAR STRUCTURE 90,92,94,96,98,100,102,104,106,108,110Zr; calculated energy levels, J, π, B(E2), deformation parameters; deduced coexistence of prolate and triaxial shapes.

doi: 10.1103/PhysRevLett.117.172502
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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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2015FL01      Phys.Rev. C 91, 034310 (2015)

F.Flavigny, D.Pauwels, D.Radulov, I.J.Darby, H.De Witte, J.Diriken, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, M.Huyse, V.S.Ivanov, U.Koster, B.A.Marsh, T.Otsuka, L.Popescu, R.Raabe, M.D.Seliverstov, N.Shimizu, A.M.Sjodin, Y.Tsunoda, P.Van den Bergh, P.Van Duppen, J.Van de Walle, M.Venhart, W.B.Walters, K.Wimmer

Characterization of the low-lying 0+ AND 2+ states in 68Ni via β decay of the low-spin 68Co isomer

RADIOACTIVITY 68Co(β-), (β-n)[from 68Mn -> 68Fe -> 68Co decay chain, 68Mn from 238U(p, F), E=1 GeV]; measured Eγ, Iγ, βγ-, γγ-coin, half-life of first excited 0+ state by βγ(t) using RILIS and Miniball array at ISOLDE-CERN facility. 68Ni; deduced levels, J, π, β feedings, logft, E0 decays, delayed neutron emission probability Pn, B(E2), configuration. Comparison with previous results, and with Monte Carlo shell model (MCSM) calculations. 67,68Fe, 67Co, 68Ga, 136I(β-); detected γ rays.

NUCLEAR STRUCTURE 68Ni; calculated Potential energy surfaces in (Q0, Q2) plane for the ground state and first 2+ state. Large-scale Monte Carlo shell model calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.034310
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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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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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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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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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