Experimental evidence for the reducibility of multifragment emission probabilities

Multifragmentation has been studied for 36Ar-induced reactions on a 197Au target at E/A = 80 and 110 MeV and for 129Xe-induced reactions on several targets (natCu, 89y, 165ho, 197Au) and E/A = 40, 50 and 60 MeV. The probability of emitting n intermediate-mass-fragments is shown to be binomial at each transversal energy and reducible to an elementary binary probability p. For each target and at each bombarding energy, this probability p shows a thermal nature by giving linear Arrhenius plots. For the 129Xe-induced reactions, a nearly universal linear Arrhenius plot is observed at each bombarding energy, indicating a large degree of target independence