Abstract
The evolution of a nucleus after p - annihilation at rest is studied. The process is divided into two successive phases: a rapid phase, described by an intranuclear cascade model and a slow phase, akin to an evaporation process. The distribution of the residue masses after the second phase is calculated and compared to the recent radiochemical measurements for 98 Mo. The evolution of the number of pions, and the distribution of the number of fast ejected nucleons and of participants is studied. The latter two are fitted by negative binomials. The meaning of this observation is discussed. The mass dependence of several quantities, like the maximum excitation energy and the average mass loss is also investigated. Finally, the possibility of a multifragmentation is discussed.
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