Study of thermometers for measuring a microcanonical phase transition in nuclear fragmentation Original Research Article

The aim of this theoretical work is to study how the thermodynamic temperature is related to the known thermometers for nuclei especially in view of studying the microcanonical phase transition. It is known within the MMMC-model that the “S-shape” of the caloric equation of state e∗ (T) is the signal of a phase transition in a system with conserved energy. We find that this signal could be seen in the experimentally accessible slope temperatures Tslope for different particle types and also in the isotopic temperatures THeLi. The calculated isotopic temperatures THHe are weaker correlated to the shape of the thermodynamic temperature and therefore are less favorable to study the signal of a microcanonical phase transition. We also show that the signal is very sensitive to variations in mass of the source.