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PhysRevC.105.024318.pdf | 1.04 MB | Adobe PDF | 見る/開く |
タイトル: | Super- and hyperdeformation in ⁶⁰Zn, ⁶²Zn, and ⁶⁴Ge at high spins |
著者: | Yoshida, Kenichi |
著者名の別形: | 吉田, 賢市 |
発行日: | Feb-2022 |
出版者: | American Physical Society (APS) |
誌名: | Physical Review C |
巻: | 105 |
号: | 2 |
論文番号: | 024318 |
抄録: | Background: The observation of the superdeformed (SD) bands in ⁶⁰, ⁶²Zn indicates that the particle number 30 is a magic particle number, where two- and four-neutron single particles are considered to be promoted to the intruder 1g₉/₂ shell. However, the SD-yrast band in ⁶²Zn is assigned negative parity. Purpose: I investigate various SD configurations in the rapidly rotating ⁶⁰, ⁶²Zn and ⁶⁴Ge, and attempt elucidating the different roles of the energy gaps at particle numbers 30 and 32. Method: I employ a nuclear energy-density functional method: the configuration-constrained cranked Skyrme-Kohn-Sham approach is used to describe the rotational bands near the yrast line. Results: The negative-parity SD bands appear higher in energy than the positive-parity SD-yrast band in ⁶⁰Zn by about 4 MeV, which is indicative of the SD doubly magic nucleus. However, the energy gap in ⁶⁴Ge is smaller ≈2–3 MeV, though the quadrupole deformation of the SD states in ⁶⁴Ge is greater than that of ⁶⁰Zn. The present calculation predicts the occurrence of the hyperdeformed state in ⁶⁰Zn and ⁶⁴Ge at a high rotational frequency ≈2.0MeV/ℏ due to the occupation of the h₁₁/₂ shell. Conclusions: An SD-shell gap at particle number 30 and 32 appears at different deformations and the energy gap at particle number 32 is low, which make the SD structures of ⁶²Zn unique, where the negative-parity SD states appear lower in energy than the positive-parity one. |
著作権等: | ©2022 American Physical Society |
URI: | http://hdl.handle.net/2433/274166 |
DOI(出版社版): | 10.1103/PhysRevC.105.024318 |
出現コレクション: | 学術雑誌掲載論文等 |

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