Random forest-based prediction of decay modes and half-lives of superheavy nuclei  

作　　者：Bo‑Shuai Cai Cen‑Xi Yuan 

机构地区：[1]Sino‑French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China

出　　处：《Nuclear Science and Techniques》2023年第12期271-280,共10页核技术（英文）

基　　金：supported by the Guangdong Major Project of Basic and Applied Basic Research under Grant No. 2021B0301030006;the computational resources from SYSU and the National Supercomputer Center in Guangzhou。

摘　　要：Information on the decay process of nuclides in the superheavy region is critical in investigating new elements beyond oganesson and the island of stability.This paper presents the application of a random forest algorithm to examine the competition among different decay modes in the superheavy region,includingα decay,β^(-)decay,β^(+)decay,electron capture and spontaneous fission.The observed half-lives and dominant decay mode are well reproduced.The dominant decay mode of 96.9%of the nuclei beyond ^(212) Po is correctly obtained.Further,α decay is predicted to be the dominant decay mode for isotopes in new elements Z=119-122,except for spontaneous fission in certain even–even elements owing to the increased Coulomb repulsion and odd–even effect.The predicted half-lives demonstrate the existence of a long-lived spontaneous fission island southwest of ^(298) Fl caused by the competition between the fission barrier and Coulomb repulsion.A better understanding of spontaneous fission,particularly beyond ^(286)Fl,is crucial in the search for new elements and the island of stability.

关 键 词：Decay mode Superheavy nuclide Random forest 

分 类 号：O571[理学—粒子物理与原子核物理] TP181[理学—物理]