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72 results on '"I, Nishizuka"'

1. Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy

Author

G.X. Zhang, H. Watanabe, G.D. Dracoulis, F.G. Kondev, G.J. Lane, P.H. Regan, P.-A. Söderström, P.M. Walker, K. Yoshida, H. Kanaoka, Z. Korkulu, P.S. Lee, J.J. Liu, S. Nishimura, J. Wu, A. Yagi, D.S. Ahn, T. Alharbi, H. Baba, F. Browne, A.M. Bruce, M.P. Carpenter, R.J. Carroll, K.Y. Chae, C.J. Chiara, Zs. Dombradi, P. Doornenbal, A. Estrade, N. Fukuda, C. Griffin, E. Ideguchi, N. Inabe, T. Isobe, S. Kanaya, I. Kojouharov, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, T. Lauritsen, C.S. Lee, E.J. Lee, C.J. Lister, G. Lorusso, G. Lotay, E.A. McCutchan, C.-B. Moon, I. Nishizuka, C.R. Nita, A. Odahara, Z. Patel, V.H. Phong, Zs. Podolyák, O.J. Roberts, H. Sakurai, H. Schaffner, D. Seweryniak, C.M. Shand, Y. Shimizu, T. Sumikama, H. Suzuki, H. Takeda, S. Terashima, Zs. Vajta, J.J. Valiente-Dóbon, Z.Y. Xu, and S. Zhu

Subjects
Physics, QC1-999
Abstract

The neutron-rich dysprosium isotopes 168Dy102 and 169Dy103 have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For 168Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched 170Er target performed at Argonne National Laboratory. This isomer is assigned Jπ=Kπ=(4−) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N=102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In 169Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ=(1/2−) isomeric state at 166 keV to the Kπ=(5/2−) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N=103 isotone 173Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.

Published
2019
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2. K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

Author

P.-A. Söderström, P.M. Walker, J. Wu, H.L. Liu, P.H. Regan, H. Watanabe, P. Doornenbal, Z. Korkulu, P. Lee, J.J. Liu, G. Lorusso, S. Nishimura, V.H. Phong, T. Sumikama, F.R. Xu, A. Yagi, G.X. Zhang, D.S. Ahn, T. Alharbi, H. Baba, F. Browne, A.M. Bruce, R.J. Carroll, K.Y. Chae, Zs. Dombradi, A. Estrade, N. Fukuda, C.J. Griffin, E. Ideguchi, N. Inabe, T. Isobe, H. Kanaoka, S. Kanaya, I. Kojouharov, F.G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G.J. Lane, E.J. Lee, C.S. Lee, G. Lotay, C.-B. Moon, I. Nishizuka, C.R. Niţă, A. Odahara, Z. Patel, Zs. Podolyák, O.J. Roberts, H. Sakurai, H. Schaffner, C.M. Shand, H. Suzuki, H. Takeda, S. Terashima, Zs. Vajta, J.J. Valiente-Dòbon, and Z.Y. Xu

Subjects
Physics, QC1-999
Abstract

A detailed study of the structure of the doubly mid-shell nucleus Dy104166170 has been carried out, following isomeric and β decay. We have measured the yrast band up to the spin-parity Jπ=6+ state, the K=2 γ-vibration band up to the 5+ state, a low-lying negative-parity band based on a 2− state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the Kπ=6+ two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the ground-state band an order of magnitude lower than predicted by NpNn systematics. This is interpreted as being due to γ-vibrational mixing from a near degeneracy of the isomer and the 6+ state of the γ band. Furthermore, the parent nucleus 170Tb has been determined to have a half-life of 0.91(−13+18) s with a possible spin-parity of 2−. Keywords: K isomer, Dysprosium, Mid-shell, γ-Ray spectroscopy

Published
2016
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3. Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell

Author

H. Watanabe, G.X. Zhang, K. Yoshida, P.M. Walker, J.J. Liu, J. Wu, P.H. Regan, P.-A. Söderström, H. Kanaoka, Z. Korkulu, P.S. Lee, S. Nishimura, A. Yagi, D.S. Ahn, T. Alharbi, H. Baba, F. Browne, A.M. Bruce, R.J. Carroll, K.Y. Chae, Zs. Dombradi, P. Doornenbal, A. Estrade, N. Fukuda, C. Griffin, E. Ideguchi, N. Inabe, T. Isobe, S. Kanaya, I. Kojouharov, F.G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G.J. Lane, C.S. Lee, E.J. Lee, G. Lorusso, G. Lotay, C.-B. Moon, I. Nishizuka, C.R. Nita, A. Odahara, Z. Patel, V.H. Phong, Zs. Podolyák, O.J. Roberts, H. Sakurai, H. Schaffner, C.M. Shand, Y. Shimizu, T. Sumikama, H. Suzuki, H. Takeda, S. Terashima, Zs. Vajta, J.J. Valiente-Dóbon, and Z.Y. Xu

Subjects
172Dy, K isomer, Decay spectroscopy, Axial symmetry, γ vibration, Physics, QC1-999
Abstract

The level structure of 172Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a 238U beam. A long-lived isomeric state with T1/2=0.71(5) s and Kπ=8− has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus 172Ho via allowed β decays. The robust nature of the Kπ=8− isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.

Published
2016
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4. Decay spectroscopy of 160Sm: The lightest four-quasiparticle K isomer

Author

Z. Patel, Zs. Podolyák, P.M. Walker, P.H. Regan, P.-A. Söderström, H. Watanabe, E. Ideguchi, G.S. Simpson, S. Nishimura, F. Browne, P. Doornenbal, G. Lorusso, S. Rice, L. Sinclair, T. Sumikama, J. Wu, Z.Y. Xu, N. Aoi, H. Baba, F.L. Bello Garrote, G. Benzoni, R. Daido, Zs. Dombrádi, Y. Fang, N. Fukuda, G. Gey, S. Go, A. Gottardo, N. Inabe, T. Isobe, D. Kameda, K. Kobayashi, M. Kobayashi, T. Komatsubara, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, H.L. Liu, M. Matsushita, S. Michimasa, C.-B. Moon, H. Nishibata, I. Nishizuka, A. Odahara, E. Şahin, H. Sakurai, H. Schaffner, H. Suzuki, H. Takeda, M. Tanaka, J. Taprogge, Zs. Vajta, F.R. Xu, A. Yagi, and R. Yokoyama

Subjects
Physics, QC1-999
Abstract

The decay of a new four-quasiparticle isomeric state in 160Sm has been observed using γ-ray spectroscopy at the RIBF, RIKEN. The four-quasiparticle state is assigned a 2π⊗2ν π52−[532], π52+[413], ν52−[523], ν72+[633] configuration. The half-life of this (11+) state is measured to be 1.8(4) μs. The (11+) isomer decays into a rotational band structure, based on a (6−) ν52−[523]⊗ν72+[633] bandhead, consistent with the gK−gR values. This decays to a (5−) two-proton quasiparticle state, which in turn decays to the ground state band. Potential energy surface and blocked-BCS calculations were performed in the deformed midshell region around 160Sm. They reveal a significant influence from β6 deformation and that 160Sm is the best candidate for the lightest four-quasiparticle K isomer to exist in this region. The relationship between reduced hindrance and isomer excitation energy for E1 transitions from multiquasiparticle states is considered with the new data from 160Sm. The E1 data are found to agree with the existing relationship for E2 transitions.

Published
2016
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5. Gamow-Teller decay of Te142 to I142

Author

B. Moon, C.-B. Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P. Doornenbal, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P.-A. Söderström, T. Sumikama, H. Watanabe, J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba, F. L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, Y. K. Kwon, C. S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura, H. Nishibata, I. Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, and R. Yokoyama

Published
2023
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6. Lifetime measurements of the first 2+ states in 104,106Zr: Evolution of ground-state deformations

Author

F. Browne, A.M. Bruce, T. Sumikama, I. Nishizuka, S. Nishimura, P. Doornenbal, G. Lorusso, P.-A. Söderström, H. Watanabe, R. Daido, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z.Y. Xu, A. Yagi, H. Baba, N. Chiga, R. Carroll, F. Didierjean, Y. Fang, N. Fukuda, G. Gey, E. Ideguchi, N. Inabe, T. Isobe, D. Kameda, I. Kojouharov, N. Kurz, T. Kubo, S. Lalkovski, Z. Li, R. Lozeva, H. Nishibata, A. Odahara, Zs. Podolyák, P.H. Regan, O.J. Roberts, H. Sakurai, H. Schaffner, G.S. Simpson, H. Suzuki, H. Takeda, M. Tanaka, J. Taprogge, V. Werner, and O. Wieland

Subjects
Physics, QC1-999
Abstract

The first fast-timing measurements from nuclides produced via the in-flight fission mechanism are reported. The lifetimes of the first 2+ states in 104,106Zr nuclei have been measured via β-delayed γ-ray timing of stopped radioactive isotope beams. An improved precision for the lifetime of the 21+ state in 104Zr was obtained, τ(21+)=2.90−20+25 ns, as well as a first measurement of the 21+ state in 106Zr, τ(21+)=2.60−15+20 ns, with corresponding reduced transition probabilities of B(E2;21+→0g.s.+)=0.39(2) e2b2 and 0.31(1) e2b2, respectively. Comparisons of the extracted ground-state deformations, β2=0.39(1) (104Zr) and β2=0.36(1) (106Zr) with model calculations indicate a persistence of prolate deformation. The data show that 104Zr is the most deformed of the neutron-rich Zr isotopes measured so far.

Published
2015
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7. 94 β -Decay Half-Lives of Neutron-Rich Cs55 to Ho67 : Experimental Feedback and Evaluation of the r -Process Rare-Earth Peak Formation

Author

J. Wu, S. Nishimura, G. Lorusso, P. Möller, E. Ideguchi, P.-H. Regan, G. S. Simpson, P.-A. Söderström, P. M. Walker, H. Watanabe, Z. Y. Xu, H. Baba, F. Browne, R. Daido, P. Doornenbal, Y. F. Fang, N. Fukuda, G. Gey, T. Isobe, Z. Korkulu, P. S. Lee, J. J. Liu, Z. Li, Z. Patel, V. Phong, S. Rice, H. Sakurai, L. Sinclair, T. Sumikama, M. Tanaka, A. Yagi, Y. L. Ye, R. Yokoyama, G. X. Zhang, D. S. Ahn, T. Alharbi, N. Aoi, F. L. Bello Garrote, G. Benzoni, A. M. Bruce, R. J. Carroll, K. Y. Chae, Z. Dombradi, A. Estrade, A. Gottardo, C. J. Griffin, N. Inabe, D. Kameda, H. Kanaoka, I. Kojouharov, F. G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G. J. Lane, E. J. Lee, T. Lokotko, G. Lotay, C.-B. Moon, D. Murai, H. Nishibata, I. Nishizuka, C. R. Nita, A. Odahara, Zs. Podolyák, O. J. Roberts, H. Schaffner, C. Shand, Y. Shimizu, H. Suzuki, H. Takeda, J. Taprogge, S. Terashima, Z. Vajta, and S. Yoshida

Published
2017
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8. Various nuclear structures in Xe140 studied by β decay of ground and isomeric states in I140

Author

A. Yagi, A. Odahara, H. Nishibata, R. Lozeva, C.-B. Moon, S. Nishimura, K. Yoshida, N. Yoshinaga, C. Watanabe, K. Higashiyama, T. Shimoda, R. Daido, Y. Fang, P. S. Lee, B. Moon, P. Doornenbal, G. Lorusso, P.-A. Söderström, T. Sumikama, H. Watanabe, T. Isobe, H. Baba, H. Sakurai, F. Browne, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki, N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, Y. Shimizu, D. Murai, F. L. Bello Garrote, J.-M. Daugas, F. Didierjean, E. Ideguchi, S. Iimura, T. Ishigaki, H. S. Jung, T. Komatsubara, Y. K. Kwon, C. S. Lee, S. Morimoto, M. Niikura, I. Nishizuka, and K. Tshoo

Published
2022
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9. First observation of the π0h11/2⊗ν0h9/2 partner orbital configuration in the odd-odd I138 nucleus

Author

B. Moon, A. Gargano, H. Naïdja, C.-B. Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P. Doornenbal, G. Lorusso, Z. Patel, S. Rice, M. Si, L. Sinclair, P.-A. Söderström, T. Sumikama, H. Watanabe, J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba, F. L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, Y. K. Kwon, C. S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura, H. Nishibata, I. Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, and R. Yokoyama

Published
2022
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10. Three-quasiparticle isomers in odd-even Pm159,161 : Calling for modified spin-orbit interaction for the neutron-rich region

Author

Tetsuro Komatsubara, Toshiyuki Kubo, Long-Jun Wang, I. Kojouharov, H. Baba, Y. F. Fang, Giuseppe Lorusso, Jan Taprogge, F. L. Bello Garrote, I. Nishizuka, Hirofumi Watanabe, Masafumi Matsushita, Shunji Nishimura, S. Inabe, A. Gottardo, H. Schaffner, Z. H. Li, Motoki Kobayashi, L. Sinclair, F. Browne, G. Benzoni, Nori Aoi, M. Tanaka, D. Kameda, E. Sahin, Gary Simpson, Cui Juan Lv, Zhengyu Xu, Toshiyuki Sumikama, Guillaume Gey, Shintaro Go, Chang-Bum Moon, P. Doornenbal, Hiroyuki Takeda, Zena Patel, T. Isobe, Hiroshi Suzuki, Atsuko Odahara, R. Yokoyama, N. Kurz, Naoki Fukuda, Stephen Rice, Zs. Vajta, Yang Sun, Hiroyoshi Sakurai, Shin'ichiro Michimasa, P. A. Söderström, Ayumi Yagi, Eiji Ideguchi, Yan Xin Liu, István Kuti, K. Kobayashi, R. Daido, Jinguang Wu, and Hiroki Nishibata

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Fission, Spin–orbit interaction, 01 natural sciences, Ion, 0103 physical sciences, Quasiparticle, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Nucleon
Abstract

Neutron-rich Pm ( Z = 61 ) isotopes were studied by delayed γ -ray spectroscopy at RIBF, RIKEN Nishina Center using the in-flight fission of a 345 MeV/nucleon U 238 beam. A cluster-type Ge detector array, EURICA, was used to measure the delayed γ rays from stopped ions. Isomeric γ decays were observed in Pm 159 and Pm 161 with half-lives of 4.97(12) μ s and 0.79(4) μ s , respectively. Level schemes for Pm 159 and Pm 161 were constructed in this study. The isomeric states of Pm 159 and Pm 161 could be interpreted as two quasiparticle excitations of neutrons with the configurations of ν ( 7 / 2 [ 633 ] ⊗ 5 / 2 [ 523 ] ) and ν ( 7 / 2 [ 633 ] ⊗ 1 / 2 [ 521 ] ) , respectively. They are analogous to the isomers that have been observed systematically in other even-mass N = 98 and N = 100 isotones in this region. A projected shell model calculation was performed and it reproduced the order of three-quasiparticle states only if new Nilsson parameters with an N -dependent spin-orbit interaction were used. This work demonstrates that the strength of spin-orbit interactions in standard Nilsson parameters needs to be modified to study the properties of neutron-rich rare-earth nuclei around A = 165 , and provides new evidence supporting the existence of the deformed N = 98 subshell gap in odd-mass nuclei for the first time.

Published
2021
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11. Erratum: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author

J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences
Published
2021
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12. Observation of new neutron-rich isotopes in the vicinity of Zr 110

Author

Takashi Kubo, Zena Patel, H. Takeda, Eiji Ideguchi, F. Didierjean, G. Lorusso, Zhengyu Xu, T. Isobe, Raymond J. Carroll, Jan Taprogge, Y. F. Fang, Naoki Fukuda, Zs. Podolyák, Kenichi Yoshida, R. Daido, O. Wieland, Toshiyuki Sumikama, R. Lozeva, H. Baba, Z. H. Li, F. Browne, Ayumi Yagi, Hiroyoshi Sakurai, D. Kameda, Shin-Ichiro Nishimura, Guillaume Gey, Hiroshi Suzuki, P. Doornenbal, S. Lalkovski, P. H. Regan, Atsuko Odahara, Stephen Rice, L. Sinclair, Momoko Tanaka, I. Nishizuka, Nobuyuki Chiga, Gary Simpson, Y. Shimizu, Alison Bruce, P. A. Söderström, Naohito Inabe, Hirofumi Watanabe, Hiroki Nishibata, Oliver J. Roberts, V. Werner, Jin Wu, RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Japan Society for the Promotion of Science, National Research Foundation of Korea, Science and Technology Facilities Council (UK), Department of Energy (US), Federal Ministry of Education and Research (Germany), Ministerio de Ciencia e Innovación (España), Department for Business, Energy and Industrial Strategy (UK), National Measurement System (UK), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear reaction, Isotope, Spectrometer, 010308 nuclear & particles physics, Fission, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Time of flight, 0103 physical sciences, Nuclear Reactions, Physics::Accelerator Physics, Neutron, 010306 general physics, Nucleon, Nuclear Experiment, Beam (structure)
Abstract

5 pags., 3 figs., 2 tabs., Neutron-rich radioactive isotope (RI) beams in the vicinity of Zr110 were produced using the in-flight fission of a 345-MeV/nucleon U238 beam at the RIKEN Radioactive Isotope Beam Factory. The RI beams were separated in flight by the large-acceptance two-stage fragment separator BigRIPS. Isotopes were clearly identified in a low-background particle-identification plot, which was obtained from the measurements of time of flight, magnetic rigidity, and energy loss using beam-line detectors placed in the BigRIPS separator and the ZeroDegree spectrometer. Nine new isotopes, Br101, Kr102, Rb105,106, Sr108, Y110,111, Zr114, and Nb117, are reported for the first time, with their measured production cross sections compared with the extrapolations of lighter isotopes down to the femtobarn regime., This experiment was carried out at the RIBF operated by the RIKEN Nishina Center, and the Center for Nuclear Study, the University of Tokyo. The authors acknowledge the RIBF accelerator staffs for their efforts in delivering an intense 238U beam. This work was supported by JSPS KAKENHI Grants No. 2301752, No. 24740188, No. 25247045, No. 26800117, and No. 16K17680, NRF Grant No. 2016K1A3A7A09005575, STFC Grants No. ST/J000132/1, No. ST/J000051/1, No. ST/K502431/1, No. ST/L005743/1, No. ST/P003885/1, No. ST/P003982/1, and No. ST/P005314/1, DOE Grant No. DE-FG02-91ER 40609, BMBF Grant No. 05P19RDFN1, and Spanish Ministerio de Ciencia e Innovación under Contracts No. FPA2009- 13377-C02 and No. FPA2011-29854-C04. P.H.R. and G.L. acknowledge additional support from the UK Department for Business, Energy and Industrial Strategy (BEIS) via funding for the UK National Measurement System. P.-A.S. was financed by the RIKEN Foreign Postdoctoral Researcher Program

Published
2021
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13. Nuclear structure of Te isotopes beyond neutron magic number N=82

Author

Y. Shimizu, Giuseppe Lorusso, F. L. Bello Garrote, I. Nishizuka, T. Isobe, Chang-Bum Moon, A. Jungclaus, S. Morimoto, Naohito Inabe, Y. F. Fang, Zs. Vajta, Hiroshi Watanabe, Roman Gernhäuser, C. S. Lee, Hiroshi Suzuki, Toshiyuki Sumikama, Shunji Nishimura, H. Schaffner, M. Si, D. Mücher, Hiroyuki Takeda, Daichi Murai, F. Browne, Hiroki Nishibata, Atsuko Odahara, Anna Wendt, J. M. Daugas, Guillaume Gey, L. Sinclair, Hiroyoshi Sakurai, I. Kojouharov, P. A. Söderström, Ayumi Yagi, S. Bönig, Byung-Sik Hong, Gary Simpson, R. Orlandi, Younghun Kwon, A. Montaner-Pizá, Stephen Rice, D. Kameda, J. M. Keatings, Eiji Ideguchi, Rin Yokoyama, K. Moschner, A. Gargano, S. Ilieva, Jan Taprogge, K. Yoshinaga, Hyo Soon Jung, B. Moon, R. Daido, Zena Patel, D. S. Ahn, P. Doornenbal, Jin Wu, H. Naïdja, K. Tshoo, N. Kurz, K. Steiger, Naoki Fukuda, Megumi Niikura, P. Lee, F. Didierjean, Tetsuro Komatsubara, Toshiyuki Kubo, T. Kröll, R. Lozeva, F. Drouet, Z. H. Li, H. Baba, Zhengyu Xu, T. Ishigaki, RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Institute for Basic Science (South Korea), National Research Foundation of Korea, Ministerio de Economía y Competitividad (España), Japan Society for the Promotion of Science, National Research, Development and Innovation Office (Hungary), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Isotope, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Nuclear Theory, Nuclear structure, Nuclear Structure, 7. Clean energy, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Neutron, 010306 general physics, Nucleon, Nuclear Experiment, Beam (structure), Magic number (physics)
Abstract

15 pags., 10 figs., 4 tabs., Newly observed decay schemes of the nuclei Sb137 and Sb138 are reported. The neutron-rich Sb isotopes were produced by the in-flight fragmentation of a U238 primary beam with an energy of 345 MeV/nucleon. Several new excited states of Te137 with tentatively assigned spin-parities of (5/2-), (9/2-), and (7/2) have been established which play an important role in the evolution of neutron levels beyond N=82. The study of the ß decay of Sb138 led to a considerable extension of the level scheme of Te138 including the identification of several nonyrast states. The structure of Te137 and Te138 is discussed on the basis of large-scale shell-model calculations performed using two different effective interactions., This work was carried out at the RIBF operated by RIKEN Nishina Center and CNS, University of Tokyo. Part of the WAS3ABi was supported by the Rare Isotope Science Project (RISP) of the Institute for Basic Science (IBS) funded by the Ministry of Science, ICT and Future Planning (MSIP) and National Research Foundation (NRF) of the Republic of Korea (Grant No. 2013M7A1A1075764). This research was supported by NRF of the Republic of Korea (Grants No. 2019R1A6A3A03031564 and No. 2018R1A5A1025563), IBS of the Republic of Korea (Grants No. IBS-R031-D1 and No. IBS-R031-Y1), the Spanish Ministerio de Economía y Competitividad (Grant No. FPA2017-84756-C4-2-P), and JSPS KAKENHI of Japan (Grant No. 25247045). The support from FR-JP LIA is also acknowledged. C.S.L. acknowledges the support from NRF of the Republic of Korea (Grants No. 2017M2A2A6A02071071 and No. 2016R1D1A1A09917463). Z.V. acknowledges the supports from the National Research, Development and Innovation Fund of Hungary, financed under the K18 funding scheme with Project No. K128947 and by the European Regional Development Fund (Grant No. GINOP-2.3.3-15-2016- 00034), as well as by the National Research, Development and Innovation Office NKFIH (Grant No. PD 124717).

Published
2021
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14. Isomeric and β -decay spectroscopy of Ho173,174

Author

P. Lee, Zs. Dombrádi, I. Nishizuka, P. M. Walker, C. M. Shand, Naohito Inabe, F. G. Kondev, Jinguang Wu, Zs. Vajta, Eiji Ideguchi, Jenny Lee, Shigeru Kubono, C. S. Lee, S. Kanaya, N. Kurz, Oliver J. Roberts, Ayumi Yagi, C. R. Nita, Atsuko Odahara, Zhengyu Xu, C. J. Griffin, Y. Shimizu, Z. Patel, G. X. Zhang, D. S. Ahn, H. Baba, V. H. Phong, Naoki Fukuda, Raymond J. Carroll, Hiroyoshi Sakurai, Gavin Lotay, S. Lalkovski, Zs. Podolyák, Toshiyuki Kubo, Shunji Nishimura, F. Browne, Eunji Lee, T. Isobe, A. Estrade, István Kuti, Satoru Terashima, G. J. Lane, Giuseppe Lorusso, Z. Korkulu, A. C. Dai, P. Doornenbal, P. H. Regan, Hiroshi Watanabe, H. Kanaoka, Furong Xu, Thamer Alharbi, H. Schaffner, K. Y. Chae, P. A. Söderström, Toshiyuki Sumikama, Hiroyuki Takeda, Alison Bruce, J. J. Valiente-Dobón, J. Liu, Chang-Bum Moon, Hiroshi Suzuki, and I. Kojouharov

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Physical chemistry, 010306 general physics, Spectroscopy, 01 natural sciences, Beta decay
Published
2020
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15. Spectroscopy of Cd99 and In101 from β decays of In99 and Sn101

Author

F. Browne, Zhengyu Xu, I. Kojouharov, Y. F. Fang, A. Blazhev, Jinguang Wu, D. S. Ahn, Roman Gernhäuser, P. A. Söderström, D. Kameda, B. Blank, Igor T. Čeliković, T. Isobe, Shunji Nishimura, R. Krücken, H. Schaffner, M. Górska, P. Doornenbal, Z. Wang, I. Nishizuka, Toshiyuki Kubo, Stephen Rice, D. Lubos, K. Steiger, S. Ilieva, M. M. Rajabali, Naohito Inabe, Joochun Park, Young-Ki Kim, Younghun Kwon, A. Jungclaus, Hiroshi Suzuki, Hirofumi Watanabe, Y. Shimizu, T. Faestermann, H. Grawe, N. Kurz, P. Boutachkov, Naoki Fukuda, L. Sinclair, Giuseppe Lorusso, H. Baba, N. Goel, Hiroyoshi Sakurai, Toshiyuki Sumikama, K. Moschner, J. Giovinazzo, Hiroyuki Takeda, G. D. Kim, Daichi Murai, M. Lewitowicz, and Zena Patel

Subjects
Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Excited state, 0103 physical sciences, SHELL model, Atomic physics, 010306 general physics, Spectroscopy, Branching (polymer chemistry), 01 natural sciences, Coincidence, Spectral line
Abstract

We report on new γ-ray spectroscopy results from β decays of In99 and Sn101. 30 new γ rays were observed following the β decay of In99, and inconsistencies in the literature with respect to the γ rays following the β decay of Sn101 were addressed with two confirmed cases and two new transitions. The experimental γ-ray energies, intensities, and coincidence relationships are discussed with shell model calculations, where theoretical β-decay branching ratios from the parent nuclei and γ-ray cascades of excited states from the daughter nuclei were combined to generate hypothetical βγ spectra and βγγ coincidence matrices. The most intense β-delayed γ-ray branches in both Cd99 and In101 were well reproduced with this approach, and several γ rays were assigned to new excited states based on their good agreement with shell model predictions.

Published
2020
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16. Shape evolution of neutron-rich Mo106,108,110 isotopes in the triaxial degree of freedom

Author

I. Nishizuka, Hiroyoshi Sakurai, S. Choi, Eiji Ideguchi, Stephen Rice, Nobuyuki Chiga, T. Isobe, Hiroki Nishibata, Toshiyuki Sumikama, F. Browne, D. Kameda, Alison Bruce, V. Werner, G. Gey, I. Kojouharov, G. S. Simpson, Zhou Li, Jinguang Wu, S. Lalkovski, Zhengyu Xu, Naohito Inabe, Raymond J. Carroll, P. H. Regan, Ayumi Yagi, Shin-Ichiro Nishimura, P. Doornenbal, Giuseppe Lorusso, Zs. Podolyák, Jan Taprogge, Nobuo Hinohara, Oliver J. Roberts, H. Baba, Naoki Fukuda, J. H. Ha, F. Didierjean, R. Daido, L. Sinclair, Hiroshi Suzuki, O. Wieland, Hirofumi Watanabe, Momoko Tanaka, Y. F. Fang, N. Kurz, P. A. Söderström, H. Schaffner, R. Lozeva, Atsuko Odahara, Zena Patel, Takashi Kubo, and H. Takeda

Subjects
Mass number, Physics, 010308 nuclear & particles physics, Nuclear structure, Moment of inertia, 7. Clean energy, 01 natural sciences, Molecular physics, Excited state, 0103 physical sciences, Quadrupole, Neutron, 010306 general physics, Spectroscopy, Wave function
Abstract

Background: Neutron-rich nuclei with mass number between 100 and 110 attract much attention, since several kinds of shapes, such as spherical, prolate, oblate, and triaxial shapes, are predicted. In particular, for neutron-rich Mo isotopes, different models predict different magnitudes and rigidity of triaxial deformation. Previous interpretations of experimental results based solely on low-lying 2+2 states are insufficient to distinguish between the rigid triaxial shape, γ vibration, or γ -soft rotor. Purpose: The shape evolution of 106Mo, 108Mo, and 110Mo is investigated through their 2+1-state lifetimes, decay-branching ratios of the 2+2 state, and energies of the low-lying collective excited states with Kπ = 0+, 2+, and 4+. Method: β -delayed γ -ray spectroscopy was employed for neutron-rich Nb and Zr isotopes produced at the RIKEN RI Beam Factory to populate excited states in 106Mo , 108Mo , and 110Mo . The EUroball-RIKEN Cluster Array was used for high-resolution γ -ray detection and lifetimes of the 2+1 states were determined using the UK fast-timing array of LaBr3(Ce) detectors. Results: New γ -ray transitions and levels are reported, including newly assigned 0+2 states in 108,110Mo . Quadrupole deformations were obtained for 106,108,110Mo from their 2+1 energies and lifetimes. The β -delayed neutron-emission probabilities of 108 Nb and 110 Nb were determined by examining the γ rays of their respective daughter decays. Conclusions: The even-odd energy staggering in the 2+2 band was compared with typical patterns of the γ -vibrational band, rigid triaxial rotor, and γ -soft rotor. The very small even-odd staggering of 106 Mo, 108Mo, and 110Mo favors a γ -vibrational band assignment. The kinematic moment of inertia for the 2+2 band showed a trend similar to the ground-state band, which is as expected for the γ -vibrational band. Beyond-mean-field calculations employing the constrained Hartree-Fock-Bogoliubov and local quasiparticle-random-phase approximation method using the SLy 5 + T interaction reproduced the ground and 2+2 bands in 106Mo and 108Mo . The collective wave functions are consistent with the interpretation of the 2+2 band as the γ -vibrational band of the prolate shape. However, the staggering pattern observed in 110Mo differs from the one suggested in the calculations which predict a γ -soft rotor. There was no experimental indication of the oblate shape or the γ -soft rotor predicted in these Mo isotopes.

Published
2020
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17. Isomer spectroscopy of neutron-rich 168Tb103

Author

J. J. Valiente-Dobón, Hiroyoshi Sakurai, P. H. Regan, K. Y. Chae, H. L. Liu, P. Lee, A Yag, V. H. Phong, Zhengyu Xu, H. Baba, Shigeru Kubono, Gavin Lotay, Eunji Lee, Shunji Nishimura, I. Nishizuka, Furong Xu, H. Kanaoka, Eiji Ideguchi, N. Kurz, C-B Moon, Zs. Vajta, C. S. Lee, Philip M Walker, W. N. Catford, C. J. Griffin, F. G. Kondev, Naoki Fukuda, Raymond J. Carroll, T. Isobe, L. A. Gurgi, Alison Bruce, Atsuko Odahara, J. J. Liu, Toshiyuki Kubo, S. Yoshida, Jin Wu, Thamer Alharbi, P-A Soderstrom, István Kuti, Satoru Terashima, C. R. Nita, C. M. Shand, Oliver J. Roberts, Gregory Lane, Giuseppe Lorusso, Zs. Dombrádi, Zena Patel, Zsolt Podolyak, S. Lalkovski, P. Doornenbal, H. Schaffner, Toshiyuki Sumikama, T. Berry, F. Browne, Hiroshi Suzuki, I. Kojouharov, Hiroyuki Takeda, A. Estrade, Naohito Inabe, Hirofumi Watanabe, Z. Korkulu, and G. X. Zhang

Subjects
Radiation, Spectrometer, 010308 nuclear & particles physics, Chemistry, Fission, Nuclear Theory, chemistry.chemical_element, Germanium, 01 natural sciences, Semiconductor detector, Nuclear physics, Excited state, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Spectroscopy
Abstract

In-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm thick 9Be target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus 170Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified eventby- event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent β-decay. Discrete γ-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3)

Published
2017
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18. Half-lives of Sr73 and Y76 and the consequences for the proton dripline

Author

F. Browne, V. Werner, T. Isobe, Shin-Ichiro Nishimura, Hirofumi Watanabe, L. Sinclair, P. J. Davies, Toshiyuki Sumikama, Giuseppe Lorusso, D. Lubos, R. Wadsworth, Naoki Fukuda, Jacek Dobaczewski, Zena Patel, Peter Schury, Shigeru Kubono, P. A. Söderström, H. Baba, Hiroyoshi Sakurai, P. Doornenbal, I. Nishizuka, Z. H. Li, Jin Wu, Jack Henderson, Zhengyu Xu, D. G. Jenkins, D. S. Ahn, Alessandro Pastore, Y. F. Fang, Hiroshi Suzuki, A. Estrade, Stephen Rice, Y. Shimizu, and H. Takeda

Subjects
Physics, Proton, 010308 nuclear & particles physics, Proton decay, Nuclear Theory, 7. Clean energy, 01 natural sciences, Beta decay, Nuclear physics, medicine.anatomical_structure, Fragmentation (mass spectrometry), 0103 physical sciences, medicine, Physics::Accelerator Physics, Density functional theory, Nuclear Experiment, 010306 general physics, Nucleon, Nucleus, Beam (structure)
Abstract

The half-lives of seven nuclei have been determined in the neutron-deficient mass-70 region following their production via fragmentation of a 345 MeV/nucleon Xe124 primary beam on a 740 mg/cm2 Be9 target at the RI Beam Factory, RIKEN. The results include two new (Sr73 and Y76) half-lives and a more precise measurement for the ground-state half-life of Sr74. The new results are discussed with reference to previously published calculations that predict the location of the proton dripline in the light Sr and Y region of the nuclear chart. In addition, differences in the ground-state structure of Rb72 and Y76 are discussed with the aid of density functional theory calculations. These provide a possible explanation for why Rb72 undergoes proton decay while the α-conjugate nucleus Y76 predominantly undergoes β+ decay.

Published
2019
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19. Improved Value for the Gamow-Teller Strength of the Sn100 Beta Decay

Author

H. Baba, N. Goel, I. Kojouharov, T. Faestermann, N. Kurz, M. Górska, Young-Ki Kim, Stephen Rice, S. Ilieva, Younghun Kwon, Naoki Fukuda, P. Boutachkov, Shunji Nishimura, Z. Wang, Mustafa Rajabali, B. Blank, A. Blazhev, T. Isobe, K. Moschner, Zhi-Fang Xu, I. Nishizuka, K. Steiger, D. S. Ahn, Igor T. Čeliković, Daichi Murai, Toshiyuki Sumikama, M. Lewitowicz, Joochun Park, J. Giovinazzo, N. Warr, Hiroyuki Takeda, Y. F. Fang, A. Jungclaus, Roman Gernhäuser, Hirofumi Watanabe, Y. Shimizu, Hiroshi Suzuki, D. Kameda, Zena Patel, L. Sinclair, P. Doornenbal, Jinguang Wu, Giuseppe Lorusso, Toshiyuki Kubo, P. A. Söderström, Naohito Inabe, R. Krücken, F. Browne, Hiroyoshi Sakurai, H. Schaffner, and D. Lubos

Subjects
Physics, End point, Proton, 0103 physical sciences, Center (category theory), General Physics and Astronomy, Value (computer science), Atomic physics, 010306 general physics, Spectroscopy, 01 natural sciences, Beta decay, Energy (signal processing)
Abstract

A record number of ^{100}Sn nuclei was detected and new isotopic species toward the proton dripline were discovered at the RIKEN Nishina Center. Decay spectroscopy was performed with the high-efficiency detector arrays WAS3ABi and EURICA. Both the half-life and the β-decay end point energy of ^{100}Sn were measured more precisely than the literature values. The value and the uncertainty of the resulting strength for the pure 0^{+}→1^{+} Gamow-Teller decay was improved to B_{GT}=4.4_{-0.7}^{+0.9}. A discrimination between different model calculations was possible for the first time, and the level scheme of ^{100}In is investigated further.

Published
2019
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20. New and comprehensive β - and βp -decay spectroscopy results in the vicinity of Sn100

Author

Toshiyuki Sumikama, J. Giovinazzo, Hiroyuki Takeda, Hiroyoshi Sakurai, D. Kameda, Hidetada Baba, T. Faestermann, Stephen Rice, Y. Shimizu, Shunji Nishimura, T. Isobe, I. Kojouharov, S. Ilieva, P. Doornenbal, L. Sinclair, Young-Ki Kim, F. Browne, Y. F. Fang, Giuseppe Lorusso, Younghun Kwon, Hiroshi Watanabe, Igor T. Čeliković, Z. Wang, N. Goel, P. Boutachkov, Jinguang Wu, Joochun Park, K. Steiger, Bertram Blank, D. Lubos, Z. Patel, Naohito Inabe, A. Jungclaus, I. Nishizuka, Zhengyu Xu, Toshiyuki Kubo, Roman Gernhäuser, Mustafa Rajabali, Hiroshi Suzuki, A. Blazhev, P. A. Söderström, D. S. Ahn, G. D. Kim, Daichi Murai, M. Lewitowicz, R. Krücken, H. Schaffner, K. Moschner, H. Grawe, N. Kurz, M. Górska, and Naoki Fukuda

Subjects
Physics, Spins, 010308 nuclear & particles physics, Nuclear structure, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Neutron, Proton emission, Nuclear Experiment, 010306 general physics, Spectroscopy, Excitation
Abstract

A decay spectroscopy experiment on proton-rich nuclei in the vicinity of the doubly magic Sn100 was carried out at RIKEN Nishina Center. More than 20 nuclei with 43≤Z≤50 and N≤51, produced by fragmentation reactions were investigated via analyses of β-decay, βp-decay, and subsequent γ-ray data. Owing to higher statistics, the precision on the half-lives of many of the ground states and isomers was improved. β-decay endpoint energies of 11 states in 8 nuclei were measured for the first time, and the corresponding QEC and excitation energies were generally consistent with various mass models. Many β-delayed proton emission branching ratios were measured either for the first time or with higher precision compared to literature values, and some of them differed by more than 2σ. Many of the large discrepancies were associated with nuclei with long-lived isomeric states, highlighting large systematic uncertainties involved in these measurements. Twenty-five new γ rays were observed, and ten new states are proposed with unambiguous excitation energies, spins, and parities. Most of the energies of the excited states were consistent within 300 keV or 20%, whichever was greater, compared to shell model predictions in the proton/neutron (p1/2,g9/2) model space assuming a Sr76 core. A signature of a new (1/2-) isomer in Cd97 with T1/2=0.73(7) s was found, in good agreement with shell model predictions.

Published
2019
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21. β decays of the heaviest N=Z−1 nuclei and proton instability of In97

Author

J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu

Subjects
Physics, Nuclear physics, Proton, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, Beta (finance), 01 natural sciences, Instability
Published
2018
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22. Beta-gamma spectroscopy of the neutron-rich 150Ba

Author

Hiroyoshi Sakurai, Shunji Nishimura, Atsuko Odahara, G. Gey, Toshiyuki Sumikama, Hiroyuki Takeda, G. Benzoni, Eiji Ideguchi, D. Kameda, Rin Yokoyama, E. Sahin, Shintaro Go, Chang-Bum Moon, L. Sinclair, P. Doornenbal, M. Tanaka, K. Kobayashi, Zena Patel, Zs. Vajta, Z. H. Li, F. L. Bello Garrote, I. Nishizuka, Giuseppe Lorusso, Y. F. Fang, Hirofumi Watanabe, R. Daido, A. Gottardo, Hiroshi Suzuki, Stephen Rice, H. Schaffner, István Kuti, Jan Taprogge, Masafumi Matsushita, Hiroki Nishibata, G. S. Simpson, Motoki Kobayashi, P. A. Söderström, I. Kojouharov, Nori Aoi, Zhengyu Xu, F. Browne, Naohito Inabe, H. Baba, N. Kurz, Naoki Fukuda, T. Komatsubara, T. Inakura, T. Isobe, Shin'ichiro Michimasa, Ayumi Yagi, Toshiyuki Kubo, Jin Wu, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)

Subjects
Physics, D13 Stable and unstable nuclei, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Radiochemistry, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, D29 Nuclear decays and radioactivities (including fission), 0103 physical sciences, Physics::Accelerator Physics, D11 Models of nuclear structure, Neutron, Gamma spectroscopy, Nuclear Experiment, 010306 general physics, Beta (finance), D12 General properties of nuclei --- systematics and theoretical analysis
Abstract

International audience; Excited states in the neutron-rich nucleus 150Ba have been observed via β–γ spectroscopy at the Radioactive Isotope Beam Factory, RIKEN Nishina Center. The 150Ba ions were produced by the in-flight fission of a 238U beam with an energy of 345 MeV/nucleon. The E(2+) energy of 150Ba was identified at 100 keV, which is the lowest known in the neutron-rich Ba isotopes. A γ -ray peak was also observed at 597 keV. A mean-field calculation with a fully 3D real space was performed and a static octupole deformation was obtained for the Ba isotopes. Kπ = 0− and 1− excited states with significant octupole collectivity were newly predicted at around or lower than 1 MeV on the ground state of 150Ba by a random-phase approximation calculation. The 597 keV γ ray can be interpreted as a negative-parity state, showing that 150Ba may possess octupole collectivity.

Published
2018
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23. Erratum: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author

J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu

Subjects
0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2018
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24. β-γ and isomeric decay spectroscopy of 168Dy

Author

S. Kanaya, Hirofumi Watanabe, Y. Shimizu, Eiji Ideguchi, F. G. Kondev, Toshiyuki Kubo, Zs. Vajta, C. R. Nita, Eunji Lee, K. Y. Chae, C. S. Lee, P. Lee, A. Estrade, Shunji Nishimura, Jin Wu, Zs. Dombradi, I. Nishizuka, JJ Liu, Ayumi Yagi, István Kuti, Satoru Terashima, T. Isobe, G. J. Lane, Giuseppe Lorusso, P. A. Söderström, Shigeru Kubono, Chang-Bum Moon, P. M. Walker, G. X. Zhang, H. Schaffner, Zena Patel, Hiroshi Suzuki, D.S. Ahn, Naohito Inabe, Yang Sun, I. Kojouharov, Hiroyoshi Sakurai, Atsuko Odahara, S. Lalkovski, P. Doornenbal, P. H. Regan, J. J. Valiente-Dobón, Z. Korkulu, V. H. Phong, H. Baba, Toshiyuki Sumikama, Hiroyuki Takeda, F. Browne, Thamer Alharbi, C. M. Shand, O.J. Roberts, H. Kanaoka, C. J. Griffin, Zhengyu Xu, Gavin Lotay, Alison Bruce, Naoki Fukuda, Raymond J. Carroll, Zs. Podolyák, and N. Kurz

Subjects
Physics, 010308 nuclear & particles physics, Fission, QC1-999, 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Level structure, Experimental work, 010306 general physics, Spectroscopy, Beam (structure)
Abstract

This contribution will report on the experimental work on the level structure of 168Dy. The experimental data have been taken as part of the EURICA decay spectroscopy campaign at RIBF, RIKEN in November 2014. In the experiment, a 238U primary beam is accelerated up to 345 MeV/u with an average intensity of 12 pnA. The nuclei of interest are produced by in-flight fission of 238U impinging on Be target with a thickness of 5 mm. The excited states of 168Dy have been populated through the decay from a newly identified isomeric state and via the β decay from 168Tb. In this contribution, scientific motivations, experimental procedure and some preliminary results for this study are presented.

Published
2018

25. Discovery of Rb72 : A Nuclear Sandbank Beyond the Proton Drip Line

Author

Y. F. Fang, Jack Henderson, Hiroyoshi Sakurai, F. Browne, Simon M Rice, Jinguang Wu, Zhengyu Xu, V. Werner, H. Takeda, Z. Patel, Z. H. Li, Y. Shimizu, Shigeru Kubono, H. Baba, DeukSoon Ahn, A. Estrade, P-A Soderstrom, Shin-Ichiro Nishimura, P. Doornenbal, D. Lubos, Tomio Kubo, I. Nishizuka, T. Isobe, Peter Schury, Enrico Maglione, P. J. Davies, Lidia S. Ferreira, Hiroshi Suzuki, D. G. Jenkins, Toshiyuki Sumikama, Giuseppe Lorusso, Naoki Fukuda, L. Sinclair, Naohito Inabe, Hirofumi Watanabe, and R. Wadsworth

Subjects
Physics, Proton, 010308 nuclear & particles physics, Proton decay, SHELL model, General Physics and Astronomy, 01 natural sciences, Atomic mass, 0103 physical sciences, Atomic physics, 010306 general physics, Mirror symmetry, Energy (signal processing), Line (formation)
Abstract

In this Letter, the observation of two previously unknown isotopes is presented for the first time: $^{72}\mathrm{Rb}$ with 14 observed events and $^{77}\mathrm{Zr}$ with one observed event. From the nonobservation of the less proton-rich nucleus $^{73}\mathrm{Rb}$, we derive an upper limit for the ground-state half-life of 81 ns, consistent with the previous upper limit of 30 ns. For $^{72}\mathrm{Rb}$, we have measured a half-life of 103(22) ns. This observation of a relatively long-lived odd-odd nucleus, $^{72}\mathrm{Rb}$, with a less exotic odd-even neighbor, $^{73}\mathrm{Rb}$, being unbound shows the diffuseness of the proton drip line and the possibility of sandbanks to exist beyond it. The $^{72}\mathrm{Rb}$ half-life is consistent with a ${5}^{+}\ensuremath{\rightarrow}5/{2}^{\ensuremath{-}}$ proton decay with an energy of 800--900 keV, in agreement with the atomic mass evaluation proton-separation energy as well as results from the finite-range droplet model and shell model calculations using the GXPF1A interaction. However, we cannot explicitly exclude the possibility of a proton transition between ${9}^{+}(^{72}\mathrm{Rb})\ensuremath{\rightarrow}9/{2}^{+}(^{71}\mathrm{Kr})$ isomeric states with a broken mirror symmetry. These results imply that $^{72}\mathrm{Kr}$ is a strong waiting point in x-ray burst $rp$-process scenarios.

Published
2017
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26. Publisher's Note: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author

J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu

Subjects
Physics, Crystallography
Abstract

J. Park et al. -- 1 pag. -- Original Article: Properties of γ-decaying isomers and isomeric ratios in the 100 Sn region. Phys. Rev. C 96, 044311 (2017)

Published
2017
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27. Properties of γ -decaying isomers and isomeric ratios in the Sn100 region

Author

Joochun Park, A. Jungclaus, Hiroshi Suzuki, G. D. Kim, Daichi Murai, Igor T. Čeliković, M. Lewitowicz, F. Browne, P. A. Söderström, L. Sinclair, Naoki Fukuda, Shunji Nishimura, Y. F. Fang, Toshiyuki Kubo, A. Blazhev, Stephen Rice, R. Krücken, Roman Gernhäuser, S. Ilieva, M. M. Rajabali, M. Górska, Hidetada Baba, Toshiyuki Sumikama, Zena Patel, Zhengyu Xu, T. Isobe, D. S. Ahn, J. Giovinazzo, Hiroyuki Takeda, Young-Ki Kim, T. Faestermann, D. Kameda, H. Grawe, N. Kurz, I. Nishizuka, P. Doornenbal, K. Steiger, Bertram Blank, D. Lubos, Naohito Inabe, Hiroyoshi Sakurai, Hirofumi Watanabe, Y. Shimizu, K. Moschner, Jin Wu, H. Schaffner, P. Boutachkov, Z. Wang, N. Goel, Giuseppe Lorusso, and I. Kojouharov

Subjects
Physics, Internal conversion, Chemical research, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 0103 physical sciences, Center (category theory), Atomic physics, 010306 general physics, Spectroscopy, 7. Clean energy, 01 natural sciences, Energy (signal processing)
Abstract

Half-lives and energies of $\ensuremath{\gamma}$ rays emitted in the decay of isomeric states of nuclei in the vicinity of the doubly magic $^{100}\mathrm{Sn}$ were measured in a decay spectroscopy experiment at Rikagaku Kenkyusho (The Institute of Physical and Chemical Research) of Japan Nishina Center. The measured half-lives, some with improved precision, are consistent with literature values. Three new results include a 55-keV $E2\phantom{\rule{4pt}{0ex}}\ensuremath{\gamma}$ ray from a new $({4}^{+})$ isomer with ${T}_{1/2}=0.23(6)\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{s}$ in $^{92}\mathrm{Rh}$, a 44-keV $E2\phantom{\rule{4pt}{0ex}}\ensuremath{\gamma}$ ray from the $({15}^{+})$ isomer in $^{96}\mathrm{Ag}$, and ${T}_{1/2}({6}^{+})=13(2)$ ns in $^{98}\mathrm{Cd}$. Shell-model calculations of electromagnetic transition strengths in the $({p}_{1/2},{g}_{9/2})$ model space agree with the experimental results. In addition, experimental isomeric ratios were compared to the theoretical predictions derived with an abrasion-ablation model and the sharp cutoff model. The results agreed within a factor of 2 for most isomers. From the nonobservation of time-delayed $\ensuremath{\gamma}$ rays in $^{100}\mathrm{Sn}$, new constraints on the ${T}_{1/2}$, $\ensuremath{\gamma}$-ray energy, and internal conversion coefficients are proposed for the hypothetical isomer in $^{100}\mathrm{Sn}$.

Published
2017
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28. Isomer-delayed γ -ray spectroscopy of A=159–164 midshell nuclei and the variation of K -forbidden E1 transition hindrance factors

Author

Tetsuro Komatsubara, Hiroyoshi Sakurai, Toshiyuki Kubo, Hiroki Nishibata, P-A Soderstrom, Z. H. Li, Michikazu Kobayashi, Y. F. Fang, Masafumi Matsushita, P. H. Regan, Atsuko Odahara, Eiji Ideguchi, Jan Taprogge, Shunji Nishimura, T. Isobe, Naoki Fukuda, L. Sinclair, H. Baba, Zhengyu Xu, Naohito Inabe, Stephen Rice, A. Gottardo, F. Browne, Hirofumi Watanabe, G. Benzoni, Shin'ichiro Michimasa, F. L. Bello Garrote, I. Nishizuka, Toshiyuki Sumikama, Nori Aoi, T. Berry, N. Kurz, Ayumi Yagi, K. Kobayashi, Zs. Vajta, Rin Yokoyama, Furong Xu, Guillaume Gey, Hiroyuki Takeda, Qiong Wu, R. Daido, Zsolt Podolyak, István Kuti, D. Kameda, E. Sahin, Philip M Walker, P. Doornenbal, Jin Wu, Shintaro Go, G. Lorusso, Zena Patel, Momoko Tanaka, C-B Moon, Gary Simpson, H. Schaffner, Zs. Dombrádi, Hiroshi Suzuki, and I. Kojouharov

Subjects
Physics, Crystallography, 010308 nuclear & particles physics, Fission, Excited state, Pairing, 0103 physical sciences, Limited evidence, Atomic physics, 010306 general physics, Spectroscopy, 01 natural sciences
Abstract

Excited states have been studied in \iso{159}{Sm}, \iso{161}{Sm}, \iso{162}{Sm} (Z~=~62), \iso{163}{Eu} (Z~=~63), and \iso{164}{Gd} (Z~=~64), populated by isomeric decay following 238U projectile fission at RIBF, RIKEN. The isomer half-lives range from 50 ns to 2.6 \mus. In comparison with other published data, revised interpretations are proposed for \iso{159}{Sm} and \iso{163}{Eu}. The first data for excited states in \iso{161}{Sm} are presented, where a 2.6 \mus isomer is assigned a three-quasiparticle, K^\pi = 17/2^- structure. The interpretation is supported by multi-quasiparticle Nilsson-BCS calculations, including the blocking of pairing correlations. A consistent set of reduced E1 hindrance factors is obtained. Limited evidence is also reported for isomeric decay in 163Sm, 164Eu and 165Eu.

Published
2017
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29. K selection in the decay of the (ν52[532]⊗32[411])4− isomeric state in Zr102

Author

Stephen Rice, H. Schaffner, L. Sinclair, Hiroyoshi Sakurai, Ziye Xu, Naoki Fukuda, Hiroshi Suzuki, Toshiyuki Sumikama, Shin-Ichiro Nishimura, N. Kurz, Nobuyuki Chiga, Y. F. Fang, S. Lalkovski, Atsuko Odahara, Hirofumi Watanabe, O. Wieland, G. Gey, H. Baba, Jinguang Wu, Takashi Kubo, Giuseppe Lorusso, Raymond J. Carroll, F. Didierjean, P. A. Söderström, F. Browne, T. Isobe, N. Nishibata, Alison Bruce, Zs. Podolyák, I. Nishizuka, Ayumi Yagi, H. Takeda, Eiji Ideguchi, Z. Patel, R. Daido, P. H. Regan, I. Kojouharov, G. S. Simpson, Z. H. Li, Oliver J. Roberts, D. Kameda, Jan Taprogge, P. Doornenbal, Naohito Inabe, R. Lozeva, V. Werner, and Momoko Tanaka

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, State (functional analysis), Atomic physics, 010306 general physics, Ground state, 01 natural sciences
Abstract

The (ν 5 2 [532] ⊗ 3 2 [411]) 4− state in 102Zr, populated in the β-decay of 102Y, has been measured to be isomeric with a mean lifetime of 9.5(7) ns. It decays via four transitions, two of which are ∆K = 2 (to the 3+ and 4+ members of the 2+ γ band) and one is ∆K = 4 (to the 4+ member of the ground state 0+ band). The fourth (low-energy) transition is inferred to decay to an as-yet unassigned state. Hindrances of 106 were derived for the ∆K = 2 transitions compared to Weisskopf estimates and the ∆K = 4 transition hindered by a factor of 109 . These values are consistent with the decay pattern of the analogous isomeric state in the neighbouring N = 62 nucleus 100Sr and with the broader systematics of such transitions. A comparison of the hindrances for the ∆K = 4 transitions suggests that 102Zr is hardened against the γ degree of freedom compared to 100Sr.

Published
2017
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30. β-decay scheme ofTe140toI140: Suppression of Gamow-Teller transitions between the neutronh9/2and protonh11/2partner orbitals

Author

Shin-Ichiro Nishimura, Chang-Bum Moon, Y. Shimizu, J. M. Daugas, F. Browne, R. Lozeva, B. Moon, Hiroshi Watanabe, K. Tshoo, Tetsuro Komatsubara, Daichi Murai, Zena Patel, H. Baba, I. Kojouharov, Rin Yokoyama, T. Ishigaki, Giuseppe Lorusso, F. L. Bello Garrote, I. Nishizuka, Takashi Kubo, Cenxi Yuan, H. Takeda, Naoki Fukuda, Megumi Niikura, Stephen Rice, Toshiyuki Sumikama, Hyo Soon Jung, Ayumi Yagi, P. A. Söderström, Jin Wu, Y. K. Kwon, Byung-Sik Hong, D. Kameda, T. Isobe, L. Sinclair, S. Morimoto, Naohito Inabe, P. Doornenbal, Eiji Ideguchi, D. S. Ahn, Hiroki Nishibata, Zhengyu Xu, Y. F. Fang, P. Lee, R. Daido, Hiroshi Suzuki, C. S. Lee, Atsuko Odahara, Hiroyoshi Sakurai, and F. Didierjean

Subjects
Physics, Decay scheme, 010308 nuclear & particles physics, Fission, 01 natural sciences, Beta decay, Nuclear physics, Atomic orbital, Isospin, 0103 physical sciences, Neutron, Nuclide, Atomic physics, 010306 general physics, Nucleon
Abstract

We report for the first time the β-decay scheme of Te140 (Z=52) to I140 (Z=53), with a specific focus on the Gamow-Teller strength along N=87 isotones. These results were obtained in an experiment performed at the Radioactive Ion Beam Factory (RIBF), RIKEN, where the parent nuclide, Te140, was produced through the in-flight fission of a U238 beam at 345 MeV per nucleon impinging on a Be9 target. Based on data from the high-efficiency γ-ray spectrometer, EUROBALL-RIKEN Cluster Array (EURICA), we constructed a decay scheme of I140. The half-life of Te140 has been determined to be 350(5) ms. A level at 926 keV has been assigned as a (1+) state based on the logft value of 4.89(6). This (1+) state, commonly observed in odd-odd nuclei, can be interpreted in terms of the πh11/2νh9/2 configuration formed by the Gamow-Teller transition between a neutron in the h9/2 orbital and a proton in the h11/2 orbital. We observe a sharp contrast to this type of β-decay branching to the lower-lying 1+ states between I140 and I136, where we see a large reduction as the number of neutrons increases. This is in contrast to the prediction by large-scale shell model calculations. To investigate this type of the suppression, results of the Nilsson model calculations will be discussed. Along the isotones with N=87, we discuss a characteristic feature of the Gamow-Teller distributions at 1+ states with respect to the isospin difference.

Published
2017
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31. Nuclear structure and β -decay schemes for Te nuclides beyond N=82

Author

Rin Yokoyama, T. Isobe, Hiroshi Watanabe, Hyo Soon Jung, Eiji Ideguchi, S. Morimoto, F. Browne, B. Moon, Naohito Inabe, Daichi Murai, I. Kojouharov, Naoki Fukuda, D. Kameda, Zhengyu Xu, Toshiyuki Sumikama, Megumi Niikura, Y. F. Fang, J. M. Daugas, P. A. Söderström, Hiroyoshi Sakurai, P. Doornenbal, Chang-Bum Moon, Byungsik Hong, Y. Shimizu, R. Daido, Tetsuro Komatsubara, Hiroshi Suzuki, K. Tshoo, H. Baba, Toshiyuki Kubo, T. Ishigaki, C. S. Lee, F. Didierjean, Atsuko Odahara, Zena Patel, R. Lozeva, D. S. Ahn, L. Sinclair, Hiroki Nishibata, Stephen Rice, Giuseppe Lorusso, Cenxi Yuan, Jin Wu, H. Takeda, P. Lee, Shunji Nishimura, Y. K. Kwon, Ayumi Yagi, F. L. Bello Garrote, and I. Nishizuka

Subjects
Physics, Radionuclide, Isotope, 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear structure, 01 natural sciences, 3. Good health, Nuclear physics, Excited state, 0103 physical sciences, Neutron, Nuclide, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract

We study for the first time the internal structure of Te140 through the β-delayed γ-ray spectroscopy of Sb140. The very neutron-rich Sb140 nuclei with Z=51 and N=89 were produced by the in-flight fission of U238 beams at the Radioactive Isotope Beam Factory, RIKEN. The half-life and spin-parity of Sb140 are reported as 173±12 ms and 3−, respectively. In addition to the excited states of Te140 produced by the β-decay branch, the β-delayed one-neutron and two-neutron emission branches were also established. By identifying the first 2+ and 4+ excited states of Te140, we found that Te isotopes persist in their vibrator character with E(4+)/E(2+)=2. We discuss the distinctive features manifest in this region revealed in pairs of isotopes with the same neutron holes and particles with respect to N=82.

Published
2017
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32. Systematic study of individual charge-changing cross sections of intermediate-energy secondary beams

Author

S. Yamaki, T. Yamaguchi, J. Kouno, K. Sato, N. Ichihashi, T. Suzuki, K. Abe, Y. Abe, M. Fukuda, H. Furuki, N. Inaba, K. Iwamoto, T. Izumikawa, Y. Kamisho, N. Kikuchi, A. Kitagawa, M. Mihara, S. Miyazawa, S. Momota, Y. Morita, D. Nagae, M. Nagashima, Y. Nakamura, R. Nishikiori, D. Nishimura, I. Nishizuka, T. Ohtsubo, J. Ohno, A. Ozawa, T. Sakai, S. Sato, D. Sera, F. Suzaki, S. Suzuki, M. Wakabayashi, M. Yaguchi, and S. Yasumoto

Subjects
Nuclear and High Energy Physics, Isotope, Chemistry, chemistry.chemical_element, Charge (physics), Intermediate energy, Z number, sense organs, Irradiation, Nuclide, Atomic physics, skin and connective tissue diseases, Nuclear Experiment, Instrumentation, Projectile fragmentation, Carbon
Abstract

Charge-changing interactions of stable and unstable medium-mass nuclides have been systematically investigated at intermediate energies. Secondary beams ranging from Ar to Ge isotopes produced by projectile fragmentation of 56Fe and 70Ge were irradiated onto a carbon target, and their total and partial charge-changing cross sections were precisely measured. A clear odd–even effect found in the partial charge-changing cross sections monotonically varies as a function of the Z / N ratio among the isotopes, and grows toward the neutron-deficient side. The total charge-changing cross sections are sensitive to the Z number of nuclides, and tend to gradually increase toward the neutron-deficient side in some isotopes.

Published
2013
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33. Isomer-delayed gamma-ray spectroscopy of neutron-rich 166Tb

Author

I. Nishizuka, Shigeru Kubono, Toshiyuki Sumikama, T. Berry, P. A. Söderström, J. J. Valiente-Dobón, P. M. Walker, Hiroyuki Takeda, Eiji Ideguchi, Giuseppe Lorusso, P. Lee, Hirofumi Watanabe, Toshiyuki Kubo, Shunji Nishimura, J.J. Liu, H. Schaffner, H. L. Liu, Chang-Bum Moon, F. G. Kondev, István Kuti, Atsuko Odahara, Satoru Terashima, H. Baba, Z. Korkulu, Hiroshi Suzuki, Furong Xu, C. M. Shand, I. Kojouharov, Zs. Dombrádi, Naohito Inabe, A. Estrade, Ayumi Yagi, Jin Wu, V. H. Phong, Hiroyoshi Sakurai, C.R. Nita, W. N. Catford, Eunji Lee, T. Isobe, S. Lalkovski, G. X. Zhang, Gregory Lane, P. Doornenbal, P. H. Regan, F. Browne, Oliver J. Roberts, L. A. Gurgi, Alison Bruce, Zena Patel, Thamer Alharbi, H. Kanaoka, Zhengyu Xu, Gavin Lotay, C. J. Griffin, Zs. Vajta, C. S. Lee, K. Y. Chae, N. Kurz, Naoki Fukuda, Raymond J. Carroll, Zs. Podolyák, S. Kanaya, Plompen, A, Hambsch, FJ, Schillebeeckx, P, Mondelaers, W, Heyse, J, Kopecky, S, Siegler, P, Oberstedt, S, and Parnefjord Gustafsson, Fredrik

Subjects
Physics, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, 01 natural sciences, Nuclear physics, Dipole, Internal conversion, Metastability, 0103 physical sciences, Neutron, Gamma spectroscopy, 010306 general physics, Nucleon, Ground state, Nuclear Experiment
Abstract

© The Authors, published by EDP Sciences, 2017. This short paper presents the identification of a metastable, isomeric-state decay in the neutron-rich odd-odd, prolate-deformed nucleus 166Tb. The nucleus of interest was formed using the in-flight fission of a 345 MeV per nucleon 238U primary beam at the RIBF facility, RIKEN, Japan. Gamma-ray transitions decaying from the observed isomeric states in 166Tb were identified using the EURICA gamma-ray spectrometer, positioned at the final focus of the BigRIPS fragments separator. The current work identifies a single discrete gamma-ray transition of energy 119 keV which de-excites an isomeric state in 166Tb with a measured half-life of 3.5(4) μs. The multipolarity assignment for this transition is an electric dipole and is made on the basis internal conversion and decay lifetime arguments. Possible two quasi-particle Nilsson configurations for the initial and final states which are linked by this transition in 166Tb are made on the basis of comparison with Blocked BCS Nilsson calculations, with the predicted ground state configuration for this nucleus arising from the coupling of the v(1-/2)[521] and π(3+/2) Nilsson orbitals. ispartof: EPJ Web of Conferences vol:146 ispartof: ND 2016: International Conference on Nuclear Data for Science and Technology location:Bruges, Belgium date:11 Sep - 16 Sep 2016 status: Published online

Published
2017

34. μs isomers of Nd158,160

Author

F. L. Bello Garrote, I. Nishizuka, F. Browne, Toshiyuki Sumikama, Shunji Nishimura, István Kuti, Y. F. Fang, Hiroyuki Takeda, Jinguang Wu, N. Kurz, Hiroyoshi Sakurai, G. Benzoni, H. Schaffner, Tetsuro Komatsubara, Stephen Rice, Toshiyuki Kubo, Naohito Inabe, Chang-Bum Moon, Giuseppe Lorusso, Jan Taprogge, Atsuko Odahara, Guillaume Gey, T. Isobe, Rin Yokoyama, K. Kobayashi, Naoki Fukuda, Hiroshi Suzuki, D. Kameda, I. Kojouharov, Shin'ichiro Michimasa, Hiroshi Watanabe, P. A. Söderström, E. Sahin, Ayumi Yagi, M. Tanaka, Eiji Ideguchi, Z. H. Li, Masafumi Matsushita, R. Daido, Motoki Kobayashi, Nori Aoi, Z. Patel, L. Sinclair, Hiroki Nishibata, P. Doornenbal, H. Baba, Zs. Vajta, Shintaro Go, A. Gottardo, Zhengyu Xu, and Gary Simpson

Subjects
Physics, Spins, 010308 nuclear & particles physics, Fission, 0103 physical sciences, Atomic physics, 010306 general physics, Spectroscopy, 01 natural sciences
Abstract

The neutron-rich nuclei $^{158,160}\mathrm{Nd}$ have been studied via delayed $\ensuremath{\gamma}$-ray spectroscopy of $\ensuremath{\mu}\mathrm{s}$ isomeric states at the RIBF facility, RIKEN. These nuclei were produced following the projectile fission of a 345 $A\phantom{\rule{0.16em}{0ex}}\mathrm{MeV}\phantom{\rule{4pt}{0ex}}^{238}\mathrm{U}$ beam and delayed $\ensuremath{\gamma}$ rays were detected by the EURICA cluster Ge array. The isomeric states have measured half-lives of 339(20) ns and 1.63(21) $\ensuremath{\mu}\mathrm{s}$ for $^{158}\mathrm{Nd}$ and $^{160}\mathrm{Nd}$, respectively. From the observed $\ensuremath{\gamma}$ decays and the systematics of levels in the neighboring Nd isotopes first level schemes were constructed for these nuclei. The isomeric states of $^{158,160}\mathrm{Nd}$ have been assigned spins of $({6}^{\ensuremath{-}})$ and $({4}^{\ensuremath{-}})$, with proposed $\ensuremath{\nu}5/2[523]\ensuremath{\bigotimes}\ensuremath{\nu}7/2[633]$ and $\ensuremath{\nu}1/2[521]\ensuremath{\bigotimes}\ensuremath{\nu}7/2[633]$ configurations, respectively.

Published
2016
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35. 94 β-Decay Half-Lives of Neutron-Rich _{55}Cs to _{67}Ho: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation

Author

J, Wu, S, Nishimura, G, Lorusso, P, Möller, E, Ideguchi, P-H, Regan, G S, Simpson, P-A, Söderström, P M, Walker, H, Watanabe, Z Y, Xu, H, Baba, F, Browne, R, Daido, P, Doornenbal, Y F, Fang, G, Gey, T, Isobe, P S, Lee, J J, Liu, Z, Li, Z, Korkulu, Z, Patel, V, Phong, S, Rice, H, Sakurai, L, Sinclair, T, Sumikama, M, Tanaka, A, Yagi, Y L, Ye, R, Yokoyama, G X, Zhang, T, Alharbi, N, Aoi, F L, Bello Garrote, G, Benzoni, A M, Bruce, R J, Carroll, K Y, Chae, Z, Dombradi, A, Estrade, A, Gottardo, C J, Griffin, H, Kanaoka, I, Kojouharov, F G, Kondev, S, Kubono, N, Kurz, I, Kuti, S, Lalkovski, G J, Lane, E J, Lee, T, Lokotko, G, Lotay, C-B, Moon, H, Nishibata, I, Nishizuka, C R, Nita, A, Odahara, Zs, Podolyák, O J, Roberts, H, Schaffner, C, Shand, J, Taprogge, S, Terashima, Z, Vajta, and S, Yoshida

Abstract

The β-decay half-lives of 94 neutron-rich nuclei ^{144-151}Cs, ^{146-154}Ba, ^{148-156}La, ^{150-158}Ce, ^{153-160}Pr, ^{156-162}Nd, ^{159-163}Pm, ^{160-166}Sm, ^{161-168}Eu, ^{165-170}Gd, ^{166-172}Tb, ^{169-173}Dy, ^{172-175}Ho, and two isomeric states ^{174m}Er, ^{172m}Dy were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops of β-decay half-lives are observed at neutron-number N=97 for _{58}Ce, _{59}Pr, _{60}Nd, and _{62}Sm, and N=105 for _{63}Eu, _{64}Gd, _{65}Tb, and _{66}Dy. Features in the data mirror the interplay between pairing effects and microscopic structure. r-process network calculations performed for a range of mass models and astrophysical conditions show that the 57 half-lives measured for the first time play an important role in shaping the abundance pattern of rare-earth elements in the solar system.

Published
2016

36. New Isotopes and Proton Emitters–Crossing the Drip Line in the Vicinity ofSn100

Author

I. Čeliković, M. Lewitowicz, R. Gernhäuser, R. Krücken, S. Nishimura, H. Sakurai, D.S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, Y.-K. Kim, Y. K. Kwon, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, D. Lubos, K. Moschner, D. Murai, I. Nishizuka, J. Park, Z. Patel, M. Rajabali, S. Rice, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Xu

Subjects
Physics, Range (particle radiation), Isotope, Proton, 010308 nuclear & particles physics, Center (category theory), General Physics and Astronomy, 7. Clean energy, 01 natural sciences, 0103 physical sciences, Production (computer science), Atomic physics, 010306 general physics, Line (formation)
Abstract

Several new isotopes, ^{96}In, ^{94}Cd, ^{92}Ag, and ^{90}Pd, have been identified at the RIKEN Nishina Center. The study of proton drip-line nuclei in the vicinity of ^{100}Sn led to the discovery of new proton emitters ^{93}Ag and ^{89}Rh with half-lives in the submicrosecond range. The systematics of the half-lives of odd-Z nuclei with T_{z}=-1/2 toward ^{99}Sn shows a stabilizing effect of the Z=50 shell closure. Production cross sections for nuclei in the vicinity of ^{100}Sn measured at different energies and target thicknesses were compared to the cross sections calculated by epax taking into account contributions of secondary reactions in the primary target.

Published
2016
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37. New isomer found inSb8951140: Sphericity and shell evolution betweenN=82andN=90

Author

F. Nowacki, F. L. Bello Garrote, I. Nishizuka, Tetsuro Komatsubara, F. Browne, Naoki Fukuda, Chang-Bum Moon, Hiroyoshi Sakurai, S. Morimoto, P. A. Söderström, Megumi Niikura, T. Isobe, Ayumi Yagi, Hiroshi Suzuki, N. Kurz, H. Naïdja, C. S. Lee, J. Dudek, I. Kojouharov, Naohito Inabe, Rin Yokoyama, D. S. Ahn, Jin Wu, Zena Patel, R. Lozeva, Atsuko Odahara, J. M. Daugas, R. Daido, Hirofumi Watanabe, Y. K. Kwon, Eiji Ideguchi, Zhengyu Xu, Y. F. Fang, Daichi Murai, P. Lee, H. Schaffner, F. Didierjean, Takashi Kubo, Hiroki Nishibata, H. Takeda, Shin-Ichiro Nishimura, H. Baba, T. Ishigaki, Stephen Rice, D. Kameda, P. Doornenbal, L. Sinclair, H. S. Jung, Giuseppe Lorusso, and Toshiyuki Sumikama

Subjects
Physics, Crystallography, Atomic orbital, 010308 nuclear & particles physics, Neutron number, 0103 physical sciences, Shell (structure), Context (language use), State (functional analysis), 010306 general physics, Coupling (probability), 01 natural sciences, Sphericity
Abstract

In this article we report on the first spectroscopic information on $_{51}^{140}\mathrm{Sb}_{89}$ and the observation of an isomer in this nucleus with ${T}_{1/2}=41(8)$ $\ensuremath{\mu}\mathrm{s}$. It is located in close proximity to $^{140}\mathrm{Sn}$ for $N=90$, where the $\ensuremath{\nu}{f}_{7/2}$ orbit is completely filled. The possible origin of the isomeric state is a $\ensuremath{\pi}{g}_{7/2}^{1}\ifmmode\times\else\texttimes\fi{}\ensuremath{\nu}{f}_{7/2}^{\ensuremath{-}1}$ coupling configuration, resulting in a $({6}^{\ensuremath{-}})$ or $({7}^{\ensuremath{-}})$ spin-parity. This is likely caused by an inversion of the $\ensuremath{\pi}{g}_{7/2}$ and $\ensuremath{\pi}{d}_{5/2}$ orbitals at $N=89$. The existence of such an isomer far from stability is discussed extensively in the context of shell-model calculations and compared to results from mean-field calculations performed using a deformed Woods-Saxon potential. Both approaches suggest the observation of a single-particle excitation mode at an extreme neutron number.

Published
2016
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38. β-delayedγ-ray spectroscopy of non-yrast states inTe138near the neutron drip line

Author

Shin-Ichiro Nishimura, F. Didierjean, Tetsuro Komatsubara, Giuseppe Lorusso, R. Lozeva, F. Browne, Eiji Ideguchi, Daichi Murai, F. L. Bello Garrote, I. Nishizuka, Rin Yokoyama, Y. F. Fang, S. Morimoto, Hiroshi Watanabe, Jin Wu, K. Tshoo, Y. K. Kwon, L. Sinclair, Naohito Inabe, Chang-Bum Moon, Takashi Kubo, T. Isobe, Naoki Fukuda, Toshiyuki Sumikama, Stephen Rice, H. Takeda, Megumi Niikura, Ayumi Yagi, D. S. Ahn, D. Kameda, P. A. Söderström, Hiroki Nishibata, P. Doornenbal, Zena Patel, Zhengyu Xu, Atsuko Odahara, J. M. Daugas, Hiroyoshi Sakurai, Hiroshi Suzuki, C. S. Lee, P. Lee, Hyo Soon Jung, R. Daido, H. Baba, and T. Ishigaki

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Double beta decay, Yrast, SHELL model, Nuclear drip line, Spectroscopy, Beta decay
Published
2015
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39. Publisher's Note: New decay scheme of theSb85511366−isomer [Phys. Rev. C92, 024304 (2015)]

Author

D. Kameda, P. Doornenbal, Hiroyoshi Sakurai, S. Morimoto, Hiroki Nishibata, Tetsuro Komatsubara, L. Sinclair, Naohito Inabe, H. Baba, F. Nowacki, Y. K. Kwon, H. Naïdja, T. Ishigaki, F. Didierjean, Toshiyuki Sumikama, P. A. Söderström, Hiroshi Watanabe, K. Tshoo, Hyo Soon Jung, Takashi Kubo, T. Isobe, Ayumi Yagi, D. S. Ahn, Daichi Murai, Eiji Ideguchi, Giuseppe Lorusso, F. Browne, F. L. Bello Garrote, I. Nishizuka, Y. F. Fang, Rin Yokoyama, H. Takeda, Tadashi Shimoda, R. Daido, Jinguang Wu, N. Kurz, Z. Patel, Ziye Xu, Stephen Rice, Shin-Ichiro Nishimura, Naoki Fukuda, Megumi Niikura, J. M. Daugas, R. Lozeva, Chang-Bum Moon, I. Kojouharov, H. Schaffner, Hiroshi Suzuki, and Atsuko Odahara

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Quantum mechanics
Published
2015
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40. New decay scheme of theSb8551136 6−isomer

Author

Rin Yokoyama, Chang-Bum Moon, Giuseppe Lorusso, Naoki Fukuda, Takashi Kubo, Hiroyoshi Sakurai, I. Kojouharov, H. S. Jung, H. Takeda, Megumi Niikura, Eiji Ideguchi, F. Browne, Tetsuro Komatsubara, Atsuko Odahara, H. Baba, S. Morimoto, R. Daido, T. Ishigaki, F. L. Bello Garrote, I. Nishizuka, K. Tshoo, Shin-Ichiro Nishimura, Naohito Inabe, Hirofumi Watanabe, L. Sinclair, Zena Patel, F. Nowacki, T. Isobe, F. Didierjean, Tadashi Shimoda, N. Kurz, Daichi Murai, H. Naïdja, Toshiyuki Sumikama, R. Lozeva, P. A. Söderström, Ayumi Yagi, D. Kameda, Jin Wu, J. M. Daugas, Hiroshi Suzuki, P. Doornenbal, H. Schaffner, Y. K. Kwon, D. S. Ahn, Y. F. Fang, Zhengyu Xu, Hiroki Nishibata, and Stephen Rice

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Fission, Yrast, Neutron, Atomic physics, Ground state
Abstract

We report new data on the $^{136}\mathrm{Sb}\phantom{\rule{4pt}{0ex}}{6}^{\ensuremath{-}}$ yrast isomer with ${T}_{1/2}=489(40) \mathrm{ns}$ and $\ensuremath{\pi}{g}_{7/2}^{1}\ifmmode\times\else\texttimes\fi{}\ensuremath{\nu}{f}_{7/2}^{3}$ configuration, populated in the projectile fission of $^{238}\mathrm{U}$ on a $^{9}\mathrm{Be}$ target. The analysis confirms the lifetime, providing a good accuracy measurement. In addition, the decay of the isomer to the ground state is newly suggested. Our result for the isomeric decay scheme is in a good agreement with shell-model calculations.

Published
2015
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41. Half-Life Measurements of \(2_{1}^{ + }\) States in the Vicinity of 108Zr and their Implications for Ground-State Deformations

Author

H. Baba, P. H. Regan, Alison Bruce, F. Didierjean, O. Wieland, Nobuyuki Chiga, Toshiyuki Sumikama, G. Gey, Jan Taprogge, Momoko Tanaka, N. Naoki, N. Kurz, Eiji Ideguchi, V. Werner, Giuseppe Lorusso, Z. H. Li, H. Schaffner, Raymond J. Carroll, T. Isobe, Atsuko Odahara, Shin-Ichiro Nishimura, Hiroyoshi Sakurai, R. Daido, F. Browne, L. Sinclair, Hiroshi Watanabe, Ayumi Yagi, Ziye Xu, I. Nishizuka, P. A. Söderström, Jinguang Wu, Hiroshi Suzuki, D. Kameda, S. Lalkovski, P. Doornenbal, Naohito Inabe, Stephen Rice, R. Lozeva, Hiroki Nishibata, Oliver J. Roberts, I. Kojouharov, G. S. Simpson, Y. F. Fang, Zs. Podolyák, Takashi Kubo, H. Takeda, and Z. Patel

Subjects
Physics, Condensed matter physics, Ground state
Published
2015
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42. New Isomers in Neutron-Rich Cs Isotopes

Author

F. Didierjean, Jinguang Wu, Naoki Fukuda, R. Daido, Megumi Niikura, P. Lee, Y. F. Fang, Toshiyuki Sumikama, Ayumi Yagi, Stephen Rice, Daichi Murai, D. Kameda, Hyo Soon Jung, Hiroshi Suzuki, Shin-Ichiro Nishimura, C. S. Lee, S. Morimoto, Giuseppe Lorusso, P. Doornenbal, R. Lozeva, F. L. Bello Garrote, Y. K. Kwon, Tomio Kubo, H. Baba, Tetsuro Komatsubara, I. Nishizuka, Naohito Inabe, Rin Yokoyama, T. Ishigaki, Hiroshi Watanabe, K. Tshoo, Atsuko Odahara, Chang-Bum Moon, Zhengyu Xu, Hiroki Nishibata, T. Isobe, Hiroyoshi Sakurai, F. Browne, Laura C. Sinclair, P. A. Söderström, Tadashi Shimoda, H. Takeda, Z. Patel, Eiji Ideguchi, D. S. Ahn, and J. M. Daugas

Subjects
Materials science, Isotope, Radiochemistry, Neutron
Published
2015
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43. β Decay Half-Lives of A ∼ 110 Nuclei on the r-Process Path

Author

Naoki Fukuda, H. Baba, N. Kurz, O. Wieland, I. Nishizuka, F. Browne, Ayumi Yagi, Giuseppe Lorusso, Hiroshi Watanabe, Hiroyoshi Sakurai, G. Gey, Eiji Ideguchi, Hiroshi Suzuki, Jinguang Wu, S. Lalkovski, T. Isobe, D. Kameda, Toshiyuki Sumikama, H. Schaffner, F. Didierjean, P. H. Regan, Nobuyuki Chiga, P. Doornenbal, R. J. Carrol, Atsuko Odahara, I. Kojouharov, G. S. Simpson, R. Daido, Alison Bruce, Takashi Kubo, P. A. Söderström, Jan Taprogge, L. Sinclair, Ziye Xu, Stephen Rice, H. Takeda, Z. Patel, R. Lozeva, Momoko Tanaka, Naohito Inabe, V. Werner, Shin-Ichiro Nishimura, Hiroki Nishibata, Oliver J. Roberts, Z. H. Li, Y. F. Fang, and Zs. Podolyák

Subjects
Radioactive ion beams, Physics, Path (topology), r-process, Half-life, Atomic physics, Beta decay, Radioactive decay
Published
2015
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44. Isomers of Pm Isotopes on the Neutron-Rich Frontier of the Deformed Z ~ 60 Region

Author

Y. F. Fang, N. Fukuda, Daisuke Kameda, Mana Tanaka, Simon Rice, Gary Simpson, F. Browne, Giuseppe Lorusso, Laura C. Sinclair, Rin Yokoyama, Guillaume Gey, Masafumi Matsushita, Jan Taprogge, Shunji Nishimura, Kazuma Kobayashi, Naohiro Inabe, István Kuti, Hiroki Nishibata, Toshiyuki Sumikama, Tetsuro Komatsubara, Toshiyuki Kubo, Hiroyuki Takeda, Zhihuan Li, Zs. Vajta, Atsuko Odahara, Zhengyu Xu, Frank Bello, Pär-Anders Söderström, Motoki Kobayashi, Nori Aoi, Tadaaki Isobe, Chang-Bum Moon, Shin'ichiro Michimasa, Ayumi Yagi, I. Nishizuka, R. Daido, Jin Wu, Hidetada Baba, Shintaro Go, Hiroshi Watanabe, Eiji Ideguchi, Zena Patel, E. Sahin, H. Suzuki, and Pieter Doornnbal

Subjects
Nuclear physics, Physics, Frontier, Isotope, Neutron
Published
2015
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45. Shape Evolution in Neutron-Rich Ru Nuclei

Author

Z. H. Li, K. Y. Chae, R. Lozeva, Atsuko Odahara, K. Steiger, F. Browne, K. Moschner, Jan Taprogge, Raymond J. Carroll, T. Isobe, Stephen Rice, Zs. Podolyák, H. Baba, Toshiyuki Kubo, Anna Wendt, Hiroshi Watanabe, N. Fukuda, H. Suzuki, Hyo Soon Jung, G. Benzoni, R. Daido, G. J. Lane, Giuseppe Lorusso, H. Schaffner, V. Werner, Eiji Ideguchi, N. Kurz, F. G. Kondev, F. C. L. Crespi, G. D. Kim, Zs. Vajta, Laura C. Sinclair, R. Orlandi, Jinguang Wu, Ayumi Yagi, Toshiyuki Sumikama, K. Yoshinaga, Hiroyuki Takeda, Hiroyoshi Sakurai, P. A. Söderström, Alison Bruce, P. H. Regan, Zhengyu Xu, Momoko Tanaka, Gary Simpson, Megumi Niikura, O. Wieland, I. Kojouharov, Z. Patel, A. Jungclaus, Young-Ki Kim, Younghun Kwon, A. Montaner-Pizá, I. Nishizuka, Y. F. Fang, F. Naqvi, D. Kameda, S. Lalkovski, P. Doornenbal, Hiroki Nishibata, Oliver J. Roberts, Roman Gernhäuser, Shunji Nishimura, Naohiro Inabe, and G. Gey

Subjects
Nuclear physics, Physics, Neutron
Published
2015
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46. Heavy rotation – evolution of quadrupole collectivity centred at the neutron-rich doubly mid-shell nucleus 170Dy

Author

P. Lee, Shigeru Kubono, H. L. Liu, T. Isobe, Oliver J. Roberts, Shunji Nishimura, F. Browne, F. G. Kondev, Hiroshi Watanabe, Alfredo Estrade, Furong Xu, J. J. Valiente-Dobón, H. Kanaoka, Toshiyuki Kubo, Giuseppe Lorusso, C. R. Nita, I. Nishizuka, Z. Korkulu, Jinguang Wu, Alison Bruce, Zhengyu Xu, K. Y. Chae, P. M. Walker, C. J. Griffin, Gavin Lotay, Naohito Inabe, Zs. Dombrádi, Hiroyoshi Sakurai, H. Baba, Thamer Alharbi, N. Kurz, Eiji Ideguchi, István Kuti, Satoru Terashima, S. Lalkovski, P. H. Regan, G. X. Zhang, C. M. Shand, Naoki Fukuda, Raymond J. Carroll, Zs. Podolyák, Gregory Lane, P. Doornenbal, T. Sumikama, Eunji Lee, P. A. Söderström, Ayumi Yagi, Hiroyuki Takeda, V. H. Phong, Z. Patel, Chang-Bum Moon, Hiroshi Suzuki, J. Liu, I. Kojouharov, Atsuko Odahara, S. Yoshida, Zs. Vajta, C. S. Lee, and H. Schaffner

Subjects
Physics, Nuclear physics, Excited state, Hadron, Quadrupole, Context (language use), Neutron, AGATA, Atomic physics, Nucleon, Ground state
Abstract

In this contribution the low-excitation structural properties of the doubly mid-shell nucleus 170Dy are discussed, with a special empasis on the evolution of the ground state rotational band within the dysprosium isotopic chain. Recent results from an experiment with the EURICA setup at RIKEN are shown in the context of previous measurements at the PRISMA+CLARA as well as the PRISMA+AGATA setups at Laboratori Nazionali di Legnaro. A brief outlook on future planned measurements is also given.

Published
2015
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47. Isomer Decay Spectroscopy ofSm164andGd166: Midshell Collectivity AroundN=100

Author

Naoki Fukuda, Zs. Podolyák, Tetsuro Komatsubara, Toshiyuki Kubo, G. Benzoni, Toshiyuki Sumikama, H. Schaffner, Masao Kobayashi, Pieter Doornenbal, István Kuti, Hiroki Nishibata, Q. D. Wu, Hiroyuki Takeda, Jin Wu, Zhengyu Xu, Shunji Nishimura, Mana Tanaka, Hiroyoshi Sakurai, Giuseppe Lorusso, A. Gottardo, Nori Aoi, Naohiro Inabe, Eiji Ideguchi, K. Kobayashi, Shin'ichiro Michimasa, Simon Rice, Ayumi Yagi, H. L. Liu, P. H. Regan, Z. H. Li, Jan Taprogge, N. Kurz, Pär-Anders Söderström, L. Sinclair, F. L. Bello Garrote, I. Nishizuka, Y. F. Fang, Gary Simpson, D. Kameda, F. Browne, E. Sahin, I. Kojouharov, Hiroshi Watanabe, Guillaume Gey, H. Baba, Tadaaki Isobe, Chang-Bum Moon, Furong Xu, Hiroshi Suzuki, Zs. Vajta, Rin Yokoyama, Atsuko Odahara, R. Daido, Shintaro Go, Zena Patel, Philip M Walker, and Masafumi Matsushita

Subjects
Physics, Nuclear physics, Excited state, Potential energy surface, General Physics and Astronomy, Parity (physics), Observable, Atomic physics, Spectroscopy, Nuclear shape, Ionizing radiation
Abstract

Excited states in the N=102 isotones 166Gd and 164Sm have been observed following isomeric decay for the first time at RIBF, RIKEN. The half-lives of the isomeric states have been measured to be 950(60) and 600(140) ns for 166Gd and 164Sm, respectively. Based on the decay patterns and potential energy surface calculations, including β6 deformation, a spin and parity of 6- has been assigned to the isomeric states in both nuclei. Collective observables are discussed in light of the systematics of the region, giving insight into nuclear shape evolution. The decrease in the ground-band energies of 166Gd and 164Sm (N=102) compared to 164Gd and 162Sm (N=100), respectively, presents evidence for the predicted deformed shell closure at N=100.

Published
2014
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48. Particle-core couplings close to neutron-rich doubly-magic nuclei

Author

V. Werner, Shin-Ichiro Nishimura, P. H. Regan, Takashi Kubo, Eiji Ideguchi, Hiroki Nishibata, F. Didierjean, H. Schaffner, R. Daido, T. Isobe, Jan Taprogge, R. Lozeva, Hiroyoshi Sakurai, Oliver J. Roberts, O. Wieland, H. Takeda, Z. Patel, F. Browne, I. Kojouharov, G. S. Simpson, Zhenyu Li, Giuseppe Lorusso, G. Gey, P. A. Söderström, A. Yag, Momoko Tanaka, H. Baba, Stephen Rice, I. Nishizuka, N. Naoki, Naohito Inabe, S. Lalkovski, Hiroshi Watanabe, Nobuyuki Chiga, Y. F. Fang, N. Kurz, D. Kameda, P. Doornenbal, Raymond J. Carroll, Zs. Podolyák, L. Sinclair, Jinguang Wu, Toshiyuki Sumikama, Atsuko Odahara, Hiroshi Suzuki, Zhengyu Xu, Alison Bruce, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear physics, Fission, 23.20.En, 23.20.Lv, 27.40.+z, 28.20.Np, Detector, General Physics and Astronomy, Neutron, Scintillator, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nucleon, 7. Clean energy, 21.10.Re, 21.10.Tg, 23.20.Js, 27.60.+j
Abstract

International audience; Preliminary results are presented from a recent campaign of experiments,performed at the PF1B cold-neutron facility at ILL (Grenoble,France), in which $\gamma$-ray spectroscopy of neutron-rich nuclei produced inneutron induced fission on 235U and 241Pu targets was performed. By usingthe EXILL array, consisting of EXOGAM, GASP and ILL-Cloverdetectors, and a digital triggerless data acquisition system, coincidences over several microseconds time windows were studied. This allowed to obtainnew information on nuclei around 132Sn, such as 132Te, 133Sb and130Sn, in which microsecond isomeric states occur. Preliminary results on210Bi, populated by cold-neutron capture, are also shown. The data offerthe possibility to investigate the couplings between core excitations andvalence particles, around the doubly magic nuclei 132Sn and 208Pb.

Published
2014
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49. First observation of an isomeric state in proton drip-line nucleus 26P

Author

K. Kanbe, Y. Kamisho, K. Abe, H. Furuki, S. Yamaki, S. Yasumoto, M. Fukuda, Yoshihiro Nakamura, Mototsugu Mihara, K. Yoshinaga, N. Kikukawa, Shinji Suzuki, M. Nagashima, N. Inaba, Takayuki Yamaguchi, T. Sakai, M. Wakabayashi, Kensaku Matsuta, K. Tashiro, D. Watanabe, J. Kouno, K. Sato, K. Iwamoto, M. Yaguchi, M. Tanaka, Jyunsei Chiba, Atsushi Kitagawa, Takuji Izumikawa, Y. Zhu, Shigekazu Fukuda, H. Hotaka, J. Ono, A. Homma, Takashi Ohtsubo, S. Miyazawa, Toshio Suzuki, M. Takechi, N. Ichihashi, Daiki Nishimura, Y. Morita, D. Sera, S. Sato, and I. Nishizuka

Subjects
Physics, medicine.anatomical_structure, Proton, QC1-999, SHELL model, medicine, State (functional analysis), Atomic physics, Nuclear isomer, Spectroscopy, Nucleus, Line (formation)
Abstract

An isomeric state in the proton drip-line nucleus 26 P has been observed by the γ-ray spectroscopy. The γ-ray energy and the half-life are 164.4 ± 0.1 keV and 120 ± 9 ns, respectively. For the isomeric transition of the mirror nucleus 26 Na, the γ-ray energy of 82.40 ± 0.04 keV and the half-life of 4.35 ± 0.16 µs are also revised. Comparing the experimental reduced transition probabilities of 26 Na and 26 P with theoretical ones calcu- lated by the shell model with the USDA interaction, the spin-parity (J π ) of the isomeric state in 26 P is most likely to be 1 + .

Published
2014

50. Isomer Spectroscopy of Neutron-rich $^{165,167}$Tb

Author

H. Baba, W. N. Catford, Hirofumi Watanabe, S. Kanaya, Furong Xu, Toshiyuki Kubo, Giuseppe Lorusso, Zsolt Podolyak, T. Isobe, I. Nishizuka, Z. Korkulu, Shunji Nishimura, Shigeru Kubono, P-A Soderstrom, István Kuti, Alison Bruce, Satoru Terashima, I. Kojouharov, P. Lee, L. A. Gurgi, H. L. Liu, Hiroyoshi Sakurai, Toshiyuki Sumikama, T. Berry, N. Kurz, Oliver J. Roberts, Chang-Bum Moon, Naohito Inabe, E. J. Lee, Ayumi Yagi, Hiroyuki Takeda, P. H. Regan, Hiroshi Suzuki, C. J. Griffin, Zhengyu Xu, K. Y. Chae, Gavin Lotay, Thamer Alharbi, G. X. Zhang, Naoki Fukuda, Raymond J. Carroll, C. M. Shand, S. Lalkovski, Eiji Ideguchi, Gregory Lane, H. Kanaoka, P. Doornenbal, Jin Wu, F. G. Kondev, Zsolt Dombrádi, F. Browne, Atsuko Odahara, C.R. Nita, Zs. Vajta, C. S. Lee, H. Schaffner, J. J. Liu, J-J Valiente-Dobón, Zena Patel, V. H. Phong, Philip M Walker, and A. Estrade

Subjects
Physics, Proton, 010308 nuclear & particles physics, Fission, Nuclear Theory, General Physics and Astronomy, Fermi surface, 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Spectroscopy, Ground state
Abstract

We present information on the excited states in the prolate-deformed, neutron-rich nuclei 165;167Tb100;102. The nuclei of interest were synthesised following in-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm 9Be target at the Radioactive Ion-Beam Factory (RIBF), RIKEN, Japan. The exotic nuclei were separated and identified event-by-event using the BigRIPS separator, with discrete energy gamma-ray decays from isomeric states with half-lives in the s regime measured using the EURICA gamma-ray spectrometer. Metastable-state decays are identified in 165Tb and 167Tb and interpreted as arising from hindered E1 decay from the 7 2 [523] single quasi-proton Nilsson configuration to rotational states built on the 3 2 [411] single quasi-proton ground state. These data correspond to the first spectroscopic information in the heaviest, odd-A terbium isotopes reported to date and provide information on proton Nilsson configurations which reside close to the Fermi surface as the 170Dy doubly-midshell nucleus is approached.

Published
2017
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