DETERMINATION OF THE TEMPERATURE OF A DISASSEMBLING NUCLEUS FROM FRAGMENT YIELDS

We derive a relation between the temperature T of the disassembling ex cited nucleus and the double ratio R of fragment yields within the mac rocanonical description by adopting Maxwell-Boltzmann statistics and t he Wigner-Seitz approximation for the Coulomb interaction between frag ments and imposing only the condition of thermal equilibrium. Under th e same assumptions, this relation between T and R, which differs from that of Albergo et al. by a Coulomb term, is also derived within the c anonical description by considering realistic values for the multiplic ities of fragments.