Relative temperatures of neutron-rich and neutron-poor compound nuclei

How the nuclear caloric curve, a key facet of the nuclear equation of state, depends on neutron excess remains an open question. We have extracted temperatures of compound nuclei produced in fusion evaporation reactions of 78K+C and 86Kr+C @ 15, 25, and 35 MeV/u from the evaporated charged particles. The excitation energy is deduced from the measured velocity of the heavy residues. We explore the systematic differences between the T vs E*/A correlation for the neutron-rich and neutron-poor systems. The systematic differences observed, within the limits of the systematic uncertainties, offer constraint on the asymmetry dependence of the nuclear caloric curve within theoretical models.