超重核^(294)118和^(291)116及其α衰变链上各核素半衰期的研究  

Half-lives of Superheavy Nuclei in ^(294)118 and ^(291)116 α-decay Chain within Generalized Liquid Drop Model

作　　者：苏昕宁[1] 张鸿飞[1] 左维[1,2,3] 李君清[2] 

机构地区：[1]兰州大学核科学与技术学院,甘肃兰州730000 [2]中国科学院近代物理研究所,甘肃兰州730000 [3]兰州重离子加速器国家实验室原子核理论中心,甘肃兰州730000

出　　处：《原子核物理评论》2009年第3期177-182,共6页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(10775061;10505016;10575119;10175074);兰州大学理论物理与数学纯基础科学基金资助项目(LZULL200805);中国科学院知识创新工程重点方向项目(KJCX3-SYW-No2);科技部重大前期研究专项基金资助项目(2007CB815004)~~

摘　　要：运用推广的液滴模型(GLDM)确定了超重核294118和291116及其α衰变链上各核素的衰变势垒,采用量子力学中的WKB方法计算α衰变中的势垒穿透几率,对该链上各原子核的α衰变半衰期进行了研究。此外,还利用Royer公式对该链上各原子核的α衰变半衰期进行了计算。结果表明,GLDM考虑亲和能与Royer公式给出的α衰变半衰期与超重核区的实验值符合很好,验证了GLDM和Royer公式在超重核区的适用性,可以用来预测超重核的半衰期。最后,预言了Z=118和116同位素链上各核素的半衰期,结果表明,在Z=118和116中存在α衰变长寿命同位素,这需要实验上的检验。The α-decay potential barrier of the newly synthesized superheavy nuclei starting from 294 118 and 291 116 have been determined and their halLlives have been studied with the Generalized Liquid Drop Model（GLDM） connected with WKB approximation and Royer＇s formulae. The a-decay half-lives of the nuclei belonging to the superheavy nuclei starting from 294 118 and 291 116 have been calculated. The calculated results are in agreement with the experimental data, which show that the α-decay half-lives of superheavy nuclei with the GLDM and Royer＇s formulae can be applied in the studying on superheavy nuclei successfully. Finally, the half-lives of Z= 118 and 116 isotopes have been predicted, and the results suggest there may be some long-lived superheavy nuclei for α-decay in those isotopes.

关 键 词：Α衰变 超重核 推广的液滴模型 半衰期 

分 类 号：O571.21[理学—粒子物理与原子核物理]