Abstract
In heavy nuclei the spatial distribution of protons and neutrons is different. At CERN SPS energies production of π+ and π- differs for pp, pn, np and nn scattering. These two facts lead to an impact parameter dependence of the π+ to π- ratio in 208Pb+208Pb 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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