| NUCLEAR PHYSICS |
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Negative Parity States in $^{39}$Cl Configured by Crossing Major Shell Orbits |
| Long-Chun Tao1,2, Y. Ichikawa2, Cen-Xi Yuan3, Y. Ishibashi2,4, A. Takamine2, A. Gladkov2,5, T. Fujita2,6, K. Asahi2,7, T. Egami8, C. Funayama7, K. Imamura2,9, Jian-Ling Lou1, T. Kawaguchi2,8, S. Kojima7, T. Nishizaka8, T. Sato2,7, D. Tominaga8, Xiao-Fei Yang1, H. Yamazaki2, Yan-Lin Ye1**, H. Ueno2 |
1School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871
2RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
3Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082
4Department of Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
5Department of Physics, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 702-701, South Korea
6Department of Physics, Osaka University, Machikaneyama 1-1 Toyonaka, Osaka 560-0034, Japan
7Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
8Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
9Department of Physics, Meiji University, 1-1-1 Higashi-Mita, Tama, Kawasaki, Kanagawa 214-8571, Japan
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| Cite this article: |
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Long-Chun Tao, Y. Ichikawa, Cen-Xi Yuan et al 2019 Chin. Phys. Lett. 36 062101 |
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Abstract Traditional "magic numbers" were once regarded as immutable throughout the nuclear chart. However, unexpected changes were found for unstable nuclei around $N=20$. With both proton and neutron numbers around the magic number of 20, the neutron-rich $^{39}$Cl isotope provides a good test case for the study of the quantum-state evolution across the major shell. In the present work, the negative parity states in $^{39}$Cl are investigated through the $\beta$ decay spectroscopy of $^{39}$S. Newly observed $\gamma$ transitions together with a new state are assigned into the level scheme of $^{39}$Cl. The spin parity of ${5/2}^{-}$ for the lowest negative parity state in $^{39}$Cl is reconfirmed using the combined $\gamma$ transition information. These systematic observations of the negative parity states in $^{39}$Cl allow a comprehensive comparison with the theoretical descriptions. The lowest ${5/2}^{-}$ state in $^{39}$Cl remains exotic in terms of comparisons with existing theoretical calculations and with the neighboring isotopes having similar single-particle configurations. Further experimental and theoretical investigations are suggested.
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Received: 30 April 2019
Published: 18 May 2019
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| PACS: |
21.10.Hw
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(Spin, parity, and isobaric spin)
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21.60.Cs
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(Shell model)
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23.40.-s
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(β-decay;double β-decay; electron and muon capture)
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| Fund: Supported by JSPS and CNRS under the Japan-France Research Cooperative Program, the Grant-in-Aid for Scientific Research on Innovative Areas "Toward new frontiers: Encounter and synergy of state-of-the-art astronomical detectors and exotic quantum beams", JSPS/MEXT KAKENHI under Grant Nos JP18HO3692 and JP18H05462, the National Key R&D Program of China (2018YFA0404403), and the National Natural Science Foundation of China Nos 11775316, 11535004, 11875074 and 11875073. |
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