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arXiv · 2602.04079

Disentangling baryon stopping and neutron skin effects in heavy-ion collisions

Grégoire Pihan·Volodymyr Vovchenko
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Abstract

We analyse the net baryon (B) and net electric charge (Q) stopping in heavy-ion collisions using the statistical model. Focusing first on isobar collisions $\rm{Ru}+\rm{Ru}$ and $\rm{Zr}+\rm{Zr}$ at $\sqrt{s_{\rm NN}}=200$~GeV, we show that the excess baryon-stopping parameter $\gamma_B \equiv (N_B/N_Q)\,(Z/A)$ can be quantitatively extracted from forthcoming RHIC measurements of charge- and baryon-stopping ratios. We then generalize the approach to other collision systems at RHIC and LHC energies and introduce an oxygen-baseline observable, $r^{OX}$, whose central-to-peripheral ratio exhibits strong and systematic sensitivity to the neutron-skin thickness of the target nucleus $X$.

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Grégoire Pihan, Volodymyr Vovchenko. 2026-02-03. Disentangling baryon stopping and neutron skin effects in heavy-ion collisions. https://arxiv.org/abs/2602.04079

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