Negative specific heat in a thermodynamic model of multifragmentation

الأصل · EN

We consider a soluble model of multifragmentation which is similar in spirit to many models which have been used to fit intermediate energy heavy ion collision data. In this model cᵥ is always positive but for finite nuclei cₚ can be negative for some temperatures and pressures. Furthermore, negative values of cₚ can be obtained in canonical treatment. One does not need to use the microcanonical ensemble. Negative values for cₚ can persist for systems as large as 200 paticles but this depends upon parameters used in the model calculation. As expected, negative specific heats are absent in the thermodynamic limit.