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物理学
New behaviors of α-particle preformation factors near doubly magic ~(100)Sn
The α-particle preformation factors of nuclei above doubly magic nuclei ~(100)Sn and ~(208)Pb are investigated within the generalized liquid drop model.The results show that the α-particle preformation factors of nuclei near self-conjugate doubly magic ~(100)Sn are significantly larger than those of analogous nuclei just above ~(208)Pb,and they will be enhanced as the nuclei move towards the N=Z line.The proton-neutron correlation energy E_(p-n)and two protons-two neutrons correlation energy E_(2p-2n)of nuclei near ~(100)Sn also exhibit a similar situation,indicating that the interactions between protons and neutrons occupying similar single-particle orbitals could enhance the α-particle preformation factors and result in superallowed a decay.This also provides evidence of the significant role of the proton-neutron interaction on α-particle preformation.Also,the linear relationship between α-particle preformation factors and the product of valence protons and valence neutrons for nuclei around ~(208)Pb is broken in the100 Sn region because the α-particle preformation factor is enhanced when a nucleus near 100 Sn moves towards the N=Z line.Furthermore,the calculated α decay half-lives fit well with the experimental data,including the recent observed self-conjugate nuclei ~(104)Te and ~(108)Xe [Phys.Rev.Lett.121,182501(2018)].
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Chinese Physics C
2022年06期
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