The alpha decay half-lives of some Thorium isotopes have been calculated within the framework of the WKB semi-classical approximation, with the inclusion of the Bohr-Sommerfeld quantization condition. The effective potentials used are the double folding nuclear potential, Coulomb potential, and centrifugal potential. Apart from using the famous M3Y-Reid and M3Y-Paris nucleon-nucleon (NN) interactions, the microscopic NN interaction derived from relativistic mean field theory Lagrangian (R3Y), with different parametrizations, has also been used. The results obtained using the R3Y potentials are compared to the phenomenological M3Y-Reid and M3Y-Paris NN interactions. The R3Y based interactions are found to perform slightly better than the M3Y based interactions for density-independent double folding model. When density-dependence of the double folding model is used, the M3Y-Paris and R3Y-W give the best descriptions of the α−decay half-lives of the Thorium isotopes, while the M3Y-Reid gives the highest deviation from experimental data.

一些钍同位素的 alpha 衰变半衰期是在 WKB 半经典近似的框架内计算的，包括 Bohr-Sommerfeld 量化条件。使用的有效势是双折叠核势、库仑势和离心势。除了使用著名的 M3Y-Reid 和 M3Y-Paris 核子-核子 (NN) 相互作用外，还使用了从相对论平均场论拉格朗日 (R3Y) 导出的具有不同参数化的微观 NN 相互作用。将使用 R3Y 电位获得的结果与现象学 M3Y-Reid 和 M3Y-Paris NN 相互作用进行比较。对于密度无关的双折叠模型，发现基于 R3Y 的相互作用的性能略好于基于 M3Y 的相互作用。钍同位素的α -衰变半衰期，而 M3Y-Reid 与实验数据的偏差最大。