Determining the neutron skin thickness by relativistic semi-isobaric collisions

Abstract

The neutron skin thickness of the benchmark nucleus ${}^{208}$Pb is crucial for our understanding of the equation of state of nuclear matter. In this paper, we discuss the effect of the neutron skin on the flow ratio observables in the semi-isobaric collisions ${}^{208}$Pb+${}^{208}$Pb and ${}^{197}$Au+${}^{197}$Au using iEBE-VISHNU hydrodynamic simulations. Our results suggest that ${}^{208}$Pb and ${}^{197}$Au should have the same magnitude of neutron skin thickness to describe the anisotropic flow ratios between the semi-isobaric systems. Our method provides an unconventional way to determine the neutron skin with the existing relativistic heavy ion collision data.

arXiv comment7 pages, 6 figures

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