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arXiv 1901.09020nucl-thnucl-ex
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alpha decay中非定域核势的批判性观点

Critical view of nonlocal nuclear potentials in alpha decay

J. E. Perez Velasquez, N. G. Kelkar, N. J. Upadhyay

摘要:

不同的模型的非局部描述的核相互作用进行了比较,通过研究它们对放射性核衰变的α粒子的发射的半衰期的影响。通过考虑预先形成的α粒子($^4$ He核)来评估半衰期,该粒子通过与子核相互作用产生的库仑势垒隧穿。一个有效的潜在的密度依赖性的双折叠强之间的α和子核的非本地框架内的潜力被发现减少的半衰期相比,那些在没有nonlocality。而在旧的Perey-Buck和São Paulo模型中,对于中到重核,下降的百分比范围在20%到40%之间,最近提出的有效势导致仅下降2%到4%。鉴于这些结果,我们提供了一个更仔细的检查用于推导本地等效电位的近似,并建议,除了散射数据,α衰变半衰期可以用作约束非局部性模型的补充工具。

英文摘要:

Different models for the nonlocal description of the nuclear interaction are compared through a study of their effects on the half-lives of radioactive nuclei decaying by the emission of alpha particles. The half-lives are evaluated by considering a pre-formed alpha particle ($^4$He nucleus) which tunnels through the Coulomb barrier generated by its interaction with the daughter nucleus. An effective potential obtained from a density dependent double folding strong potential between the alpha and the daughter nucleus within the nonlocal framework is found to decrease the half-lives as compared to those in the absence of nonlocalities. Whereas the percentage decrease within the older Perey-Buck and São Paulo models ranges between 20 to 40\% for medium to heavy nuclei, a recently proposed effective potential leads to a decrease of only 2 - 4 \%. In view of these results, we provide a closer examination of the approximations used in deriving the local equivalent potentials and propose that apart from the scattering data, the alpha decay half-lives could be used as a complementary tool for constraining the nonlocality models.

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