Author:
Deng Jun-Gang,Zhang Hong-Fei,Sun Xiao-Dong
Abstract
Abstract
The
-particle preformation factors of nuclei above doubly magic nuclei
Sn and
Pb are investigated within the generalized liquid drop model. The results show that the
-particle preformation factors of nuclei near self-conjugate doubly magic
Sn are significantly larger than those of analogous nuclei just above
Pb, and they will be enhanced as the nuclei move towards the
line. The proton–neutron correlation energy
and two protons–two neutrons correlation energy
of nuclei near
Sn also exhibit a similar situation, indicating that the interactions between protons and neutrons occupying similar single-particle orbitals could enhance the
-particle preformation factors and result in superallowed
decay. This also provides evidence of the significant role of the proton–neutron interaction on
-particle preformation. Also, the linear relationship between
-particle preformation factors and the product of valence protons and valence neutrons for nuclei around
Pb is broken in the
Sn region because the
-particle preformation factor is enhanced when a nucleus near
Sn moves towards the
line. Furthermore, the calculated
decay half-lives fit well with the experimental data, including the recent observed self-conjugate nuclei
Te and
Xe [Phys. Rev. Lett. 121, 182501 (2018)].
Funder
National Natural Science Foundation of China
Subject
Astronomy and Astrophysics,Instrumentation,Nuclear and High Energy Physics
Cited by
3 articles.
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