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r-过程路径核β(ˉ)-衰变半衰期的估算
Estimate of β(ˉ)-decay Half-lives for r-process Nuclei
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摘要: 分析了20＜A＜190范围内丰中子核β衰变的实验数据,根据半衰期随质子数、中子数以及衰变能变化所呈现的壳效应和对效应等特点,提出了一种有效估算丰中子核β衰变寿命的公式.新的计算公式形式简单包含了较少的参数、计算量小.用该公式能较为准确地再现丰中子核的β衰变半衰期.用RIKEN最新测量丰中子核半衰期检验了该公式的外推能力,本工作可以为r-过程研究提供可靠的输入数据.Abstract: Experimental data of the β--decay half-lives for the nuclei with atomic number between 20 and 190 are investigated.We have systematically studied the shell effects and pairing effects on β--decay half-lives versus the decay energy Q and nucleon numbers (Z,N).An empirical formula has been proposed to calculate the β--decay half-lives of neutron-rich nuclei.The empirical formula is simple and has relatively few parameters.Experimental β--decay half-lives of the neutron-rich nuclei are well reproduced by the new formula.In addition,the extrapolating capacity of this formula has been checked with the very recent experimental data from RIKEN.The predicted half-lives for r-process relevant nuclei with the current formula can be served as the reliable input of r-process model calculations.
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