# $π^ - π^-$ Asymmetry and the Neutron Skin in Heavy Nuclei

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In heavy nuclei the spatial distribution of protons and neutrons is different. At CERN SPS energies production of $\pi^+$ and $\pi^-$ differs for $pp$, $pn$, $np$ and $nn$ scattering. These two facts lead to an impact parameter dependence of the $\pi^+$ to $\pi^-$ ratio in $^{208}Pb + ^{208}Pb$ collisions. A recent experimen

Autor: Antoni Szczurek; Piotr Pawlowski

Fuente: https://archive.org/