We derive a relation between the temperature $T$ of the disassembling excited nucleus and the double ratio $R$ of fragment yields within the macrocanonical description by adopting Maxwell-Boltzmann statistics and the Wigner-Seitz approximation for the Coulomb interaction between fragments and imposing only the condition of thermal equilibrium. Under the 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 canonical description by considering realistic values for the multiplicities of fragments.

• Received 27 November 1996

DOI:https://doi.org/10.1103/PhysRevC.55.1376