Pb附近奇A核同质异能态半衰期的简单规律

Simple Formula for Isomer Halflives around Pb

摘要: 对Pb附近Z=78—82奇A核同质异能态IT衰变（或称为同质异能跃迁包括γ跃迁和内转换）的实验数据进行了系统的分析, 发现了奇A核同质异能态IT衰变半衰期的一个简单的规律：同位素链上角动量和宇称相同的同质异能态，半衰期的对数随质量数之间符合二次曲线关系。这说明了IT衰变的半衰期和质量数A之间有着一个指数关系。对这一段同质异能态衰变中跃迁多极性的分析可让人们对有关物理性质有更清楚的认识。对发现的简单规律也给出了可能的物理解释。

Abstract: We have investigated and analyzed the experimental data of the odd A nuclear IT (isomeric transiton) decay around Pb.We find a simple law for the IT decay halflives of the odd A nuclear isomer: there is a parabolic law between the logarithm of the halflives of the isomer with the same angular momentum and parity along the isotopic chain.This shows there is an exponential law between the halflives of IT decay and the mass number A. The analysis of the multipolarity of the IT decay could make us have a clear recognition for the physical properties.We have also discussed the possible physics behind this simple law.