Neutron/proton ratio of nucleon emissions as a probe of neutron skin

Abstract

The dependence between neutron-to-proton yield ratio ($R_{np}$) and neutron skin thickness (${\delta }_{np}$) in neutron-rich projectile induced reactions is investigated within the framework of the Isospin-Dependent Quantum Molecular Dynamics (IQMD) model. The density distribution of the Droplet model is embedded in the initialization of the neutron and proton densities in the present IQMD model. By adjusting the diffuseness parameter of neutron density in the Droplet model for the projectile, the relationship between the neutron skin thickness and the corresponding $R_{np}$ in the collisions is obtained. The results show strong linear correlation between $R_{np}$ and ${\delta }_{np}$ for neutron-rich Ca and Ni isotopes. It is suggested that $R_{np}$ may be used as an experimental observable to extract ${\delta }_{np}$ for neutron-rich nuclei, which is very significant to the study of the nuclear structure of exotic nuclei and the equation of state (EOS) of asymmetric nuclear matter.

7 pages, 5 figures; accepted by Phys. Lett. B

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• Constraints on the density dependence of the symmetry energy
• Nuclear symmetry energy probed by neutron skin thickness of nuclei
• Neutron and Proton Transverse Emission Ratio Measurements and the Density Dependence of the Asymmetry Term of the Nuclear Equation of State
• Neutron skin thickness in droplet model with surface width dependence: indications of softness of the nuclear symmetry energy
• The influence of cluster emission and the symmetry energy on neutron-proton spectral double ratios
• The neutron skin of ${}^{208}$Pb and the density dependence of the symmetry energy

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• Elimination of influence of neutron-skin size difference of initial colliding nuclei in Pb+Pb collisions
• Investigating the possibility of extracting neutron-skin thickness in nuclei by their collisions at intermediate energies
• Probing the Three-dimension Emission Source and Neutron Skin via $\pi$-$\pi$ Correlations in Heavy-Ion Collisions
• Unlocking the initial neutron density distribution from the two-pion HBT correlation function in heavy-ion collisions
• A novel filtering method for generating desired density profiles of colliding nuclei