Neutron halo and the impact-parameter dependence of the $π^+ - π^-$ asymmetry in heavy ion collisions

Details Neutron halo and the impact-parameter dependence of the $π^+ - π^-$ asymmetry in heavy ion collisions Neutron halo and the impact-parameter dependence of the $π^+ - π^-$ asymmetry in heavy ion collisions

2004-02-10

arxiv.org/abs/nucl-th/0402029v1

Physics

Nuclear Physics

Nuclear Theory

9 pages, including 4 figures

Scientific paper

10.1103/PhysRevC.70.044908

The theoretical nuclear physics predictions and experimental results on antiprotonic atoms lead to different proton and neutron spatial distributions. At CERN SPS energies production of positive and negative pions 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. The results for two models considered are almost identical. It may open a new possibility for determination of neutron density distribution in nuclei.

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