用推广的Viola-Seaborg公式计算α衰变寿命  

Calculations of a-Decay Half-Lives by the Generalized Viola-Seaborg Formula

作　　者：董铁矿[1] 任中洲[1] 

机构地区：[1]南京大学物理系,南京210008

出　　处：《高能物理与核物理》2006年第2期113-117,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10535010)国家杰出青年科学基金(10125521)国家教育部博士点专项基金(20010284036)国家重点基础研究发展规划项目(G2000077400)中国科学院知识创新工程重点项目(KJCX2-SW-N02)资助~~

摘　　要：根据Audi等编评的最新核数据表,对Z≥84,N≥128的核的α衰变实验寿命用Viola—Seaborg 公式进行最小方差拟合,得到一套新参数．用新拟合参数计算的偶偶核的衰变寿命与实验寿命很好地符合,平均偏差1．3倍．而对奇A和奇奇核理论寿命与实验寿命相差较远．考虑到处于基态时奇A和奇奇核与偶偶核的主要区别在于自旋和宇称,对Viola—Seaborg公式做了推广．在公式中引入了离心势垒 (即α粒子轨道角动量)对衰变寿命的影响．由推广公式计算的奇A和奇奇核的寿命与实验寿命平均偏差2．5倍,最大偏差5—6倍．The Viola-Seaborg formula is a well-known formula for ~ decay half-life of heavy nuclei. In this work we obtain a set of new parameters for this formula through a least-square fit to even-even nuclei between Z = 84 and Z = 110 with N greater than 126. On average, the formula can reproduce the half-lives of heavy even-even nuclei with a factor of 1.3. In order to improve the calculated results for odd-A nuclei and for odd-odd nuclei, we obtain a generalized form of the Viola-Seaborg formula by including the influence of orbital angular momentum of ~ particle on half-lives of odd-A nuclei and odd-odd nuclei. On average, half-lives of odd-A and odd-odd nuclei can be reproduced with a factor of 2.5 by the generalized Viola-Seaborg formula.

关 键 词：Viola-Seaborg公式 阻塞因子 角动量 

分 类 号：O571.321[理学—粒子物理与原子核物理] TP317.3[理学—物理]