Fragments' internal and kinetic temperatures in the framework of a Nuclear Statistical Multifragmentation Model

TL;DR

This paper investigates the relationship between fragments' internal and kinetic temperatures in nuclear multifragmentation, finding that agreement occurs only in a narrow energy range and highlighting the importance of state densities for nuclear thermometry.

Contribution

It introduces a model that does not assume a fixed relationship between internal and kinetic temperatures, exploring conditions for their agreement and the influence of state densities.

Findings

Agreement between temperatures occurs only in a narrow excitation energy range.

Internal temperature of light fragments may remain constant over a wide energy range.

Nuclear thermometry can provide insights into nuclear state densities.

Abstract

The agreement between the fragments' internal and kinetic temperatures with the breakup temperature is investigated using a Statistical Multifragmentation Model which makes no a priori as- sumption on the relationship between them. We thus examine the conditions for obtaining such agreement and find that, in the framework of our model, this holds only in a relatively narrow range of excitation energy. The role played by the qualitative shape of the fragments' state densities is also examined. Our results suggest that the internal temperature of the light fragments may be affected by this quantity, whose behavior may lead to constant internal temperatures over a wide excitation energy range. It thus suggests that the nuclear thermometry may provide valuable information on the nuclear state density.