Nuclear structure and decay modes of Ra isotopes within an axially deformed relativistic mean field model

查看全文 作　　者：Rashmirekha [1]Swain;[2]S.K.Patra;[1]B.B.Sahu 机构地区：[1]School of Applied Sciences,KIIT Deemed to be University,Bhubaneswar-751024,Odisha,India;[2]Institute of Physics,Bhubaneswar-751005,India 出　　处：《Chinese Physics C》索引2018年第42卷第8期,共9页 基　　金：Supported by Project No.SR/FTP/PS-106/2013,SERB,DST,Govt.of India 摘　　要：We examine the structural properties and half-life decay of Ra isotopes within the axially deformed Relativistic Mean-Field(RMF)theory with NL3 force parameters.We work out the binding energy(BE),RMS radii,two-neutron separation energies(S_(2n)),and some other observables.The results are in good agreement with the finite-range droplet model(FRDM)and experimental results.Considering the possibility of neutron magic number,theα-decay and cluster decay half-lives of Ra isotopes are calculated systematically using the Q-values obtained from the RMF formalism.These decay half-life calculations are carried out by taking three different empirical formulae.The calculated decay half-lives are found to be highly sensitive to the choice of Q-values.Possible shell or sub-shell closures are found at daughter nuclei with N=128 and N=126 when alpha and^8Be,^(12)C,^(18)O respectively are emitted from Ra isotopes.Though the cluster radioactivity is affected by the shell closure of parent and daughter,a long half-life indicates the stability of the parent,and a small parent half-life indicates that the shell stability of the daughter against decay. 关 键 词：物理学 物理分析 能量 分子