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PhysRevC.104.024318.pdf | 466.62 kB | Adobe PDF | 見る/開く |
タイトル: | Pairing and nonaxial-shape correlations in $N=150$ isotones |
著者: | Yoshida, Kenichi ![]() ![]() |
著者名の別形: | 吉田, 賢市 |
キーワード: | Nuclear structure & decays Nucleon distribution A ≥ 220 Nuclear density functional theory Nuclear Physics |
発行日: | Aug-2021 |
出版者: | American Physical Society (APS) |
誌名: | Physical Review C |
巻: | 104 |
号: | 2 |
論文番号: | 024318 |
抄録: | [Background:] The $K^pi=2^-$ excited band emerges systematically in $N=150$ isotones raging from Pu to No with even-$Z$ numbers, and a sharp drop in energies was observed in Cf. [Purpose:] I attempt to uncover the microscopic mechanism for the appearance of such a low-energy $2^-$ state in $^{248}$Cf. Furthermore, I investigate the possible occurrence of the low-energy $K^pi=2^+$ state to elucidate the mechanism that prefers the simultaneous breaking of the reflection and axial symmetry to the breaking of the axial symmetry alone in this mass region. [Method:] I employ a nuclear EDF method: the Skyrme-Kohn-Sham-Bogoliubov and the quasiparticle random-phase approximation are used to describe the ground state and the transition to excited states. [Results:] The Skyrme-type SkM* and SLy4 functionals reproduce the fall in energy, but not the absolute value, of the $K^pi=2^-$ state at $Z=98$, where the proton 2qp excitation $[633]7/2 otimes [521]3/2$ plays a decisive role for the peculiar isotonic dependence. I find interweaving roles by the pairing correlation of protons and the deformed shell closure at $Z=98$. The SkM* model predicts the $K^pi=2^-$ state appears lower in energy in $^{246}$Cf than in $^{248}$Cf as the Fermi level of neutrons is located in between the $[622]5/2$ and $[734]9/2$ orbitals. Except for $^{250}$Fm in the SkM* calculation, the $K^pi=2^+$ state is predicted to appear higher in energy than the $K^pi=2^-$ state because the quasi-proton $[521]1/2$ orbital is located above the $[633]7/2$ orbital. [Conclusions:] A systematic study of low-lying collective states in heavy actinide nuclei provides a rigorous testing ground for microscopic nuclear models. The present study shows a need for improvements in the EDFs to describe pairing correlations and shell structures in heavy nuclei, that are indispensable in predicting the heaviest nuclei. |
著作権等: | © 2021 American Physical Society |
URI: | http://hdl.handle.net/2433/268040 |
DOI(出版社版): | 10.1103/PhysRevC.104.024318 |
出現コレクション: | 学術雑誌掲載論文等 |
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