Significant improvement of half-life calculation of α decays by considering the nuclear medium effect

被引：10

作者：

Deng, Daming ^{[1
,3
]}

Ren, Zhongzhou ^{[2
,3
]}

Wang, Nan ^{[1
]}

机构：

[1] Shenzhen Univ, Coll Phys, Shenzhen 518060, Peoples R China

[2] Tongji Univ, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China

[3] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China

来源：

PHYSICS LETTERS B | 2019年 / 795卷

基金：

中国国家自然科学基金;

关键词：

alpha decay; Half-life; Nuclear medium effect; alpha clustering; alpha-preformation factor; MICROSCOPIC THEORY; FOLDING MODEL; PO-212; WIDTH;

D O I：

10.1016/j.physletb.2019.06.045

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We incorporate the nuclear medium effect into alpha-decay calculation through a reformulation of the conventional double-folding model. The improved model enables the alpha cluster to simultaneously change its size at different nuclear density during the Coulomb penetration process, thus reflecting the effect from the variation of nuclear mean field and Pauli blocking at the nuclear surface. To evaluate the result of such a dynamic effect, we perform a systematic calculation of alpha-decay half-lives for even-even alpha-emitters within a deformed cluster model. We found that the medium effect optimises the shape of alpha-nucleus potential at the surface region, leading to a remarkable reduction in the deviations between the theoretical and experimental decay rates. The result implies the importance of the dynamic aspect of alpha clustering in describing a realistic alpha-nucleus interaction. (C) 2019 The Author(s). Published by Elsevier B.V.

引用

页码：554 / 560

页数：7

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