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.
