Caloric curves of hot nuclei formed in reactions induced by 50 MeV/u 129Xe and 52-95 MeV/u 36Ar projectiles

J. Péter, F. Gulminelli, Y. G. Ma, A. Siwek, F. Bocage, R. Bougault, R. Brou, J. Colin, D. Cussol, D. Durand, E. Genouin-Duhamel, R. Laforest, J. F. Lecolley, T. Lefort, O. Lopez, M. Louvel, V. Métivier, N. Le Neindre, A. D. Nguyen, J. C. SteckmeyerB. Tamain, E. Vient, M. Assenard, P. Eudes, M. Germain, D. Gourio, J. L. Laville, T. Reposeur, G. Auger, P. Buchet, J. L. Charvet, R. Dayras, E. De Filippo, D. Doré, R. Legrain, L. Nalpas, C. Volant, J. Benlliure, A. Chbihi, A. Le Fèvre, N. Marie, G. Politi, S. Salou, F. Saint-Laurent, O. Tirel, J. P. Wieleczko, E. Bisquer, A. Demeyer, E. Galichet, E. Gerlic, D. Guinet, P. Lautesse, M. Stern, Ch O. Bacri, B. Borderie, J. D. Frankland, M. Parlog, E. Plagnol, M. F. Rivet, G. Tabacaru, L. Tassan-Got, E. Rosato

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Abstract

The reactions 129Xe + 119Sn at 50 MeV/u and 36Ar + 58Ni from 52 to 95 MeV/u were studied with the 4π array INDRA. The quasi-projectiles were reconstructed from peripheral to central collisions, and their excitation energies range from 2 to 20 MeV/nucleon. The apparent temperatures obtained from the kinetic energy distribution of light particles, from the double ratios of isotopic yields and from the relative populations of excited states, respectively, differ much from each other. Two statistical models, taking into account the detailed energy level structure of decaying primary fragments, can explain these differences. The relationship between the initial temperature and excitation energy does not exhibit any discontinuity of the caloric capacity: the liquid-gas phase transition is gradual.

Original languageEnglish
Pages (from-to)97-101
Number of pages5
JournalRevista Mexicana de Fisica
Volume44
Issue numberSUPPL. 2
StatePublished - Oct 1998

Keywords

  • Heavy ions
  • Liquid-gas phase transition
  • Statistical models

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