New behaviors of α-particle preformation factors near doubly magic 100Sn

被引：6
|
作者：
Deng, Jun-Gang [1 ,2 ]
Zhang, Hong-Fei [1 ,2 ]
Sun, Xiao-Dong [3 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Phys, Xian 710049, Peoples R China
[2] Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
[3] China Inst Atom Energy, China Nucl Data Ctr, Beijing 102413, Peoples R China
来源：
CHINESE PHYSICS C | 2022年 / 46卷 / 06期
基金：
中国国家自然科学基金;
关键词：
alpha decay; alpha-particle preformation factor; doubly magic nucleus; generalized liquid drop model; RP-PROCESS; DECAY; ISOTOPE; NUCLEI; PROTON; RADIOACTIVITY; FISSION; XE;
D O I：
10.1088/1674-1137/ac5a9f
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The alpha-particle preformation factors of nuclei above doubly magic nuclei Sn-100 and Pb-208 are investigated within the generalized liquid drop model. The results show that the alpha-particle preformation factors of nuclei near self-conjugate doubly magic Sn-100 are significantly larger than those of analogous nuclei just above Pb-208, and they will be enhanced as the nuclei move towards the N =Z line. The proton-neutron correlation energy Ep-n and two protons-two neutrons correlation energy E2p-2n of nuclei near loo Sn also exhibit a similar situation, indicating that the interactions between protons and neutrons occupying similar single-particle orbitals could enhance the alpha-particle preformation factors and result in superallowed alpha decay. This also provides evidence of the significant role of the proton-neutron interaction on alpha-particle preformation. Also, the linear relationship between alpha-particle preformation factors and the product of valence protons and valence neutrons for nuclei around Pb-208 is broken in the Sn-100 region because the alpha-particle preformation factor is enhanced when a nucleus near Sn-100 moves towards the N =Z line. Furthermore, the calculated alpha decay half-lives fit well with the experimental data, including the recent observed self-conjugate nuclei Te-104 and Xe-108 [Phys. Rev. Lett. 121, 182501 (2018)].
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页数：8
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