Abstract

This paper describes the application of a "hot spot" statistical model to the process of pion-induced fragmentation. In other reactions the spectra of pre-equilibrium particles are well described by the evaporation of particles from highly excited subsystems evolving within a cold nuclear system. The model is found to be very successful at describing both the $^{3}\mathrm{He}$ and $^{4}\mathrm{He}$ spectra from 160 MeV positive pion absorption on silver and is the first successful application of a statistical model to pion-induced emission of complex particles. The implications this has for the process of pion true absorption are examined.

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