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Correlation between neutron skin thickness and R_(np)

【摘要】:正The correlation between neutron-to-proton yield ratio(R_(np)) and neutron skin thickness(δ_(np)) in neutron-rich projectile induced reactions is investigated within the framework of the Isospin-Dependent Quantum Molecular Dynamics(IQMD) model.By adjusting the diffuseness parameter of neutron density in the Droplet model for the projectile,the relationship of the neutron skin thickness and the corresponding R_(np) in the collisions is obtained.We simulate the reaction between Ca or Ni isotope with ~(12)C at 50MeV/u,and the simulated data for Ca and Ni isotopes induced reactions show a good linear correlation between R_(np) andδ_(np) for neutron-rich projectile.It is suggested that R_(np) could be used as an experimental observable to extract the neutron skin thickness for neutron-rich nucleus.When the neutron skin thickness of one isotope is obtained,we can get some information on the EOS in different theoretical models such as Skyrme Hartree-Fock,relativistic mean-field and BUU model.From the isotope dependence of neutron skin thickness,a lot of information on the derivation of volume and surface symmetry energy,as well as nuclear incompressibility with respective to density can be extracted.This is very important to the study of the EOS of asymmetric nuclear matter.

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