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

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

2004-09-17

arxiv.org/abs/nucl-th/0409035v1

Int.J.Mod.Phys. A20 (2005) 618-621

Physics

Nuclear Physics

Nuclear Theory

6 pages and 2 figures, a talk by A.Szczurek at the international conference MESON2004, June 4-8, Cracow, Poland

Scientific paper

10.1142/S0217751X05021956

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 experiment at CERN seems to confirm qualitatively these predictions. It may open a possibility for determination of neutron density distribution in nuclei.

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