Determine the neutron skin type by relativistic isobaric collisions

9 Mar 2021  ·  Hao-jie Xu, Hanlin Li, Xiaobao Wang, Caiwan Shen, Fuqiang Wang ·

The effects of neutron skin on the multiplicity ($N_{\rm ch}$) and elliptic flow ($v_2$) in relativistic $^{96}_{44}$Ru+$^{96}_{44}$Ru and $^{96}_{40}$Zr+$^{96}_{40}$Zr collisions at $\sqrt{s_{_{\rm NN}}}=200$ GeV are investigated with the Trento model. It is found that the Ru+Ru/Zr+Zr ratios of the $N_{\rm ch}$ distributions and $v_2$ in mid-central collisions are exquisitely sensitive to the neutron skin type (skin vs. halo)... The state-of-the-art calculations by energy density functional theory (DFT) favor the halo-type neutron skin and can soon be confronted by experimental data. It is demonstrated that the halo-type density can serve as a good surrogate for the DFT density, and thus can be efficiently employed to probe nuclear deformities by using $v_2$ data in central collisions. We provide hereby a proof-of-principle venue to simultaneously determine the neutron skin type, thickness, and nuclear deformity. read more

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Nuclear Theory Nuclear Experiment