Pb同位素链(178≤A≤220)的α衰变的理论研究

Theoretical studies on theαdecay of Pb isotopes in the range of 178≤A≤220

利用统一裂变模型(UFM),在考虑预形成因子的情况下系统地研究了Pb同位素链(178≤A≤220)的α衰变情况,并利用包含离心势的推广的Royer(G−Royer)公式和the Viola-Seaborg Semi-empirical relationship(VSS)公式做了计算.通过理论计算值与实验值的对比分析,结果表明离心势在原子核的α衰变过程中起着非常重要的作用.同时实验值与理论值良好的一致性表明统一裂变模型、G−Royer公式和VSS公式对于Pb同位素链的α衰变的预测是可靠的,并给出了部分Pb同位素的α衰变半衰期的预测值.

The α decay half-lives of Pb isotopes in the range of 178≤A≤220 are investigated by employing a unified fission model(UFM) with consideration of the preformation factor, the generalized Royer(G-Royer)formula with the centrifugal potential and the Viola-Seaborg semi-empirical relationship(VSS). It can be seen from the comparison between experimental and theoretical half –lives that the centrifugal potential play an important role in the α decay process. Furthermore, the good agreement between experimental and theoretical result indicated that the prediction of the unified fission model, the G-Royer and the VSS formulas are reliable.The half-lives of unknown Pb isotopes are predicted.