By using freeze-out properties of multifragmenting hot nuclei produced in quasifusion central 129Xe + natSn collisions at different beam energies (32, 39, 45 and 50 AMeV) which were estimated by means of a simulation based on experimental data collected by the 4 π INDRA multidetector, heat capacity in the thermal excitation energy range 4–12.5 AMeV was calculated from total kinetic energies and multiplicities at freeze-out. The microcanonical formulation was employed. Negative heat capacity which signs a first order phase transition for finite systems is observed and confirms previous results using a different method.
Negative heat capacity for hot nuclei using formulation from the microcanonical ensemble INDRA Collaboration / Borderie, B., Piantelli, S., Bonnet, E., Bougault, R., Chbihi, A., Ducret, J.E., Frankland, J.D., Galichet, E., Gruyer, D., Henri, M., La Commara, M., Neindre, N.L., Lombardo, I., Lopez, O., Manduci, L., Parlog, M., Roy, R., Verde, G., Vigilante, M.. - In: THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI. - ISSN 1434-6001. - 56:3(2020). [10.1140/epja/s10050-020-00109-9]
Negative heat capacity for hot nuclei using formulation from the microcanonical ensemble INDRA Collaboration
La Commara M.;Lombardo I.;Vigilante M.
2020
Abstract
By using freeze-out properties of multifragmenting hot nuclei produced in quasifusion central 129Xe + natSn collisions at different beam energies (32, 39, 45 and 50 AMeV) which were estimated by means of a simulation based on experimental data collected by the 4 π INDRA multidetector, heat capacity in the thermal excitation energy range 4–12.5 AMeV was calculated from total kinetic energies and multiplicities at freeze-out. The microcanonical formulation was employed. Negative heat capacity which signs a first order phase transition for finite systems is observed and confirms previous results using a different method.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
