摘要
用Skyrme Hartree Fock+BCS方法计算了超重核的基态性质,讨论了结合能、α衰变、形变、壳结构和自发裂变等问题.计算得到的结合能较好地反映了实验测量值,α衰变能与实验值符合很好.发现基本上有两种类型的超重核形变:在270108核附近的β2≈0.2的长椭球形变和在298114核附近的近球形形变.单粒子能级分布计算表明:在质子Z=108和中子N=162存在变形壳,在质子Z=114和中子N=184存在球形壳.用得到的α衰变能和Viola Seaborg公式估算了α衰变半寿命,能合理地符合实验测量值.
The groundstate properties of superheavy nuclei are investigated using the SkyrmeHartreeFock model. The pairing correlation is treated by the BCS method with the pairing δ force. Binding energies, α decays, spontaneous fissions, shell structures and deformations are discussed. Our calculations reproduce experimential binding energies and α decay energies.It is found that superheavy nuclei can be grouped with two kinds of deformations: i) well deformed prolate shapes (β2≈0.2) around270108 and ii) nearly spherical shapes around298114. The calculated singleparticle levels show that there exist deformed shell closures at Z=108, N=162 and spherical shell closures at Z=114, N=184. With the calculated α decay energies, the αdecay halflives have been calculated using the ViolaSeaborg formula. The obtained lifetimes agree, in general, with experimental data.
出处
《原子核物理评论》
CAS
CSCD
北大核心
2003年第2期116-120,共5页
Nuclear Physics Review
基金
国家自然科学基金资助项目(10175002)
国家重大基础研究发展规划资助项目(G2000077400)
国家教育部骨干教师基金资助项目
中国科学院知识创新工程重要方向性项目(KJCX2 SW N02)
