Investigation of heavy particle radioactivity and spontaneous fission of even-Z superheavy nuclei  

作　　者：Kirandeep Sandhu Gurjit Kaur Manoj K.Sharma 

机构地区：[1]p.7.department of physics,7.s.s.4.7.s khalsa college patiala,punjab,india [2]department of physics and materials science,thapar institute of engineering and technology,patiala-147004,punjab,india

出　　处：《Chinese Physics C》2025年第4期77-89,共13页中国物理C(英文版)

基　　金：Supported by the Department of Science and Technology(DST)and Science and Engineering Research Board(SERB),New Delhi(CRG/2021/001144)。

摘　　要：The preformed cluster model(PCM)is applied to investigate the heavy particle radioactivity(HPR)and spontaneous fission(SF)processes for even-Z superheavy nuclear systems.Different proximity potentials are used to calculate the decay half-lives of Z=112-120 nuclei.The fragmentation potential and preformation distribution suggest that SF is the major contributor up to Z=114,and HPR starts competing for heavier nuclei.The heavy cluster emission is supported by Pb-magicity,whereas SF is reinforced owing to the deformations of fission fragments.The heavy cluster decay half-lives(log_(10)T_(C))are calculated using the PCM and are compared with the estimates of the analytical super asymmetric fission(ASAF)model.The calculated log_(10)T_(C) values agree well with the ASAF measurements when using the Prox-00 and Mod Prox-00 versions of potentials.However,Prox-77,Prox-88,and Prox-BW-91 are not appropriate to address the log_(10)T_(C) for Z≥116 nuclei.To resolve this,we include Z-dependence in the radius parameters.Interestingly,the half-lives match the ASAF data after the inclusion of Z-dependence.The branching ratios are also calculated for superheavy nuclei and compared with the estimates of unified description(UD)formula,universal curve(UNIV),universal decay law(UDL),Horoi formula,and ASAF measurements.Furthermore,the SF half-lives(T_(SF))of ^(282) Cn,^(284)Cn,^(284)Fl,and ^(286)Fl superheavy nuclei are estimated through various proximity potentials.Among them,Prox-oo is appropriate for addressing the experimental data.Using this potential,the SF half-lives are estimated through the PCM for Z=116-120 isotopes at different necklength parameters.Finally,the scaled total kinetic energy(TKE)values are compared with the available data.

关 键 词：heavy particle radioactivity preformed cluster model ground state decay 

分 类 号：O571.5[理学—粒子物理与原子核物理]