Research onα-decay for the superheavy nuclei with Z=118-120  

作　　者：Chen He Zhong-Ming Niu Xiao-Jun Bao Jian-You Guo 何晨;牛中明;包小军;郭建友(School of Physics and Optoelectronics Engineering,Anhui University,Hefei 230601,China;Department of Physics,Hunan Normal University,Changsha 410081,China)

机构地区：[1]School of Physics and Optoelectronics Engineering,Anhui University,Hefei 230601,China [2]Department of Physics,Hunan Normal University,Changsha 410081,China

出　　处：《Chinese Physics C》2022年第5期116-128,共13页中国物理C（英文版）

基　　金：Partly supported by the National Natural Science Foundation of China(11935001,11575002);the Key Research Foundation of Education Ministry of Anhui Province(KJ2018A0028);Anhui project(Z010118169)。

摘　　要：The generalized liquid-drop model(GLDM)with the microscopic shell correction from relativistic Hartree-Fock(RHF)calculations is used to explore theα-decay of superheavy nuclei.The known nuclei with Z=106−118 are chosen as examples for testing.The calculated half-lives ofα-decay agree with the experimental data better than those from the GLDM with the shell correction in the Weizsa¨cker-Skyrme model.Moreover,the influence of the decay energy Q_(α) onα-decay is investigated.It is determined that the Q_(α) values obtained from the WS4 model with radial basis function(RBF)correction match the experimental data optimally.Owing to these advantages,the GLDM with the RHF shell correction and WS4+RBF Q_(α) values is adopted to predict theα-decay lifetime for the unknown superheavy nuclei with Z=118−120.The trend of the availableα-decay half-lives according to the neutron number is similar to the trends of the values from the GLDM calculation without shell correction as well as the universal decay law(UDL)formula.Comparably,the RHF shell correction depresses(raises)theα-decay lifetime for most nuclei with N<186(N>186).In comparison with the half-lives of spontaneous fission,it can be concluded that theα-decay is dominant in the superheavy nuclei ^(281−304)118,^(284−306)119,and ^(287−308)120.These results are beneficial to the exploration of superheavy nuclei in experiments.

关 键 词：generalized liquid-drop model Α-DECAY superheavy nuclei relativistic Hartree-Fock WS4 model 

分 类 号：O571.3[理学—粒子物理与原子核物理]