A possible probe to neutron-skin thickness by fragment parallel momentum distribution in projectile fragmentation reactions  

作　　者：Chun-Wang Ma Yi-Jie Duan Ya-Fei Guo Chun-Yuan Qiao Yu-Ting Wang Jie Pu Kai-Xuan Cheng Hui-Ling Wei 

机构地区：[1]College of Physics,Henan Normal University,Xinxiang 453007,China [2]Institute of Nuclear Science and Technology,Henan Academy of Sciences,Zhengzhou 450015,China

出　　处：《Nuclear Science and Techniques》2024年第6期114-119,共6页核技术（英文）

基　　金：the National Natural Science Foundation of China(Nos.12375123,11975091,and 12305130);the Natural Science Foundation of Henan Province(No.242300421048);China Postdoctoral Science Foundation(No.2023M731016);Henan Postdoctoral Foundation(No.HN2022164).

摘　　要：Neutron-skin thickness is a key parameter for a neutron-rich nucleus;however,it is difficult to determine.In the framework of the Lanzhou Quantum Molecular Dynamics(LQMD)model,a possible probe for the neutron-skin thickness(δ_(np))of neutron-rich ^(48)Ca was studied in the 140A MeV ^(48)Ca+^(9)Be projectile fragmentation reaction based on the parallel momentum distribution(p∥)of the residual fragments.A Fermi-type density distribution was employed to initiate the neutron density distributions in the LQMD simulations.A combined Gaussian function with different width parameters for the left side(Γ_(L))and the right side(Γ_(R))in the distribution was used to describe the p∥of the residual fragments.Taking neutron-rich sulfur isotopes as examples,Γ_(L) shows a sensitive correlation withδ_(np) of ^(48)Ca,and is proposed as a probe for determining the neutron skin thickness of the projectile nucleus.

关 键 词：Neutron-skin thickness Projectile fragmentation Parallel momentum distribution Neutron-rich nucleus Quantum molecular dynamics model 

分 类 号：O571.5[理学—粒子物理与原子核物理]