Antiproton and antilambda annihilations on several nucleons

Antiproton and antilambda annihilations involving several nucleons at the same time are assumed and arguments in favor of such processes are discussed. A statistical model for annihilation on one or several nucleons is studied. It is shown to give very good results for annihilation on one nucleon. The predictions of such a model for annihilation on several nucleons are discussed extensively. The most important of those is the enhancement of the strange particle yield. Other predictions are made for remarkable two-body channels and in particular for the mesonless annihilation n${\ifmmode\bar\else\textasciimacron\fi{}}^{3}$He\ensuremath{\rightarrow}pp. A geometrical model is made to estimate the probability of having annihilation on several nucleons in nuclei. Finally, the relationship between our statistical approach and current dynamical models is discussed.