Abstract
We analyzed experimental data on fast neutron production in ¯p+64Cu and ¯p+238U annihilation and the ratio of231Th/231Ac isotopes from ¯p+232Th annihilation at rest. The contributions from standard reaction channels are calculated by cascade model. The annihilation pion rescattering and absorption in nuclear medium as well as the preequilibrium nucleon emission were analyzed. The calculation based on the assumption that neutron density distribution ≡uals the proton one multiplied by factor N/Z does not reproduce the experimental data. We discussed the influence of the neutron density distribution on fast neutron and isotope production. It was found that the hypothesis of the neutron halo allows one to get a reasonable description of the experimental data.
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