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

Subjects: Nuclear Science and Technology >> Radiation Physics and Technology submitted time 2024-04-08

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

Abstract： In the framework of the Lanzhou Quantum Molecular Dynamics (LQMD) model, a possible probe to the neutron-skin thickness (δ_np) of neutron-rich 48Ca is studied in 140A MeV ⁴⁸Ca + ⁹Be projectile fragmentation reaction based on parallel momentum distribution (p_//) of residual fragments.
The Fermi-type density distribution is employed to initiate the neutron density distributions in the LQMD simulation. A combined Gaussian function with different width parameters for the left side (Γ_L) and the right side (Γ_R) in distribution are used to describe the p_// of residual fragments. The value of Γ_L, taking neutron-rich sulfur isotopes as examples, shows a sensitive correlation to δnp of ⁴⁸Ca, which is suggested to be a probe to determine the neutron-skin thickness of the projectile nucleus.

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