中子反应同质异能态截面比的系统学

Systematics of Isomeric Cross Section Ratio for Neutron Induced Reactions

提出了中子反应同质异能态截面比的半经验公式 .该公式含有一系统学参数 ,适应于产物核质量数 44≤A≤ 197、同质异能态自旋 0≤Jm≤ 12和基态自旋 0 5≤Jg≤ 8的中子反应 .在入射中子能量En<2 0MeV能区 ,对该系统学参数进行了系统学研究 .通过获得的半经验公式和系统学参数 ,可以很好地再现已有实验数据 。

Based on the statistical theory and available measured isomeric cross section ratio, a systematic formula of the isomeric cross section ratio with one parameter for neutron induced reactions was developed. This formula is applicable for the mass region 44≤ A ≤197,spin region of isomeric and ground states 0≤ J m≤12 and 0 5≤ J g≤8 of the residual nucleus, respectively. Fair agreement was obtained between the systematics predictions and measurements. Within the range of nuclides and spins the systematics predictions can provide useful isomeric cross section ratio information where experimental data are of large discnepancy or where experimental data are not available.