Fission Properties of Neutron-Rich Nuclei around the End Point of r-Process  

作　　者：陈佳炜 裴俊琛 强雨 迟济怀 Jiawei Chen;Junchen Pei;Yu Qiang;Jihuai Chi(State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University,Beijing 100871,China)

机构地区：[1]State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University,Beijing 100871,China

出　　处：《Chinese Physics Letters》2023年第1期23-27,共5页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2018YFA0404403);the National Natural Science Foundation of China(Grant Nos.11975032,11835001,11790325,and 11961141003)。

摘　　要：We studied the fission properties of neutron-rich nuclei278,286Cf around the end point of r-process by microscopic self-consistent approaches. The fission barriers and potential energy surfaces are obtained by constrained static Skyrme Hartree–Fock-BCS calculations. Fission fragments are studied by dynamical time-dependent Hartree–Fock+BCS calculations. Results show that286Cf has an octupole deformation at ground state, which can increase the fission barrier height by 1.1 Me V and enhance significantly the spontaneous fission half-life. To search possible fission channels, dynamical calculations with a broad coverage of initial deformations result in two slightly asymmetric peaks around A=128 and 150 for278Cf, and A=133 and 153 for286Cf. Very asymmetric fission channels as given by semi-empirical models are not found in our results.

关 键 词：HARTREE DYNAMICAL ASYMMETRIC 

分 类 号：O57[理学—粒子物理与原子核物理]