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Thermal and chemical equilibrium for vaporizing sources |
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| Authors: | B. Borderie F. Gulminelli M.F. Rivet L. Tassan-Got M. Assenard G. Auger F. Bocage R. Bougault R. Brou Ph. Buchet J. Colin R. Dayras A. Demeyer J.D. Frankland E. Galichet E. Genouin-Duhamel E. Gerlic M. Germain D. Guinet P. Lautesse J.L. Laville J.F. Lecolley T. Lefort R. Legrain N. Le Neindre M. Louvel A.M. Maskay L. Nalpas A.D. Nguyen M. Parlog E. Plagnol A. Rahmani T. Reposeur E. Rosato F. Saint-Laurent S. Salou J.C. Steckmeyer M. Stern G. Tabacaru B. Tamain O. Tirel D. Vintache C. Volant |
| Affiliation: | (1) Institut de Physique Nucléaire, IN2P3-CNRS, 91406 Orsay cedex, France, FR;(2) LPC, IN2P3-CNRS, ISMRA et Université, 14050 Caen cedex, France, FR;(3) SUBATECH, Ecole des Mines, IN2P3-CNRS et Université, 44072 Nantes cedex 03, France, FR;(4) GANIL (DSM-CEA/IN2P3-CNRS), B.P.5027, 14021 Caen cedex, France, FR;(5) DAPNIA/SPhN, CEA/Saclay, 91191 Gif sur Yvette cedex, France, FR;(6) Institut de Physique Nucléaire, IN2P3-CNRS et Université, 69622 Villeurbanne cedex, France, FR;(7) National Institute for Physics and Nuclear Engineering, 76900 Bucharest-Magurele, Romania, RO;(8) Dipartimento di Scienze Fisiche e Sezione INFN, Univ. di Napoli “Federico II”, 80126 Napoli, Italy, IT |
| Abstract: | Vaporized sources produced in collisions between 36Ar and 58Ni at 95 MeV per nucleon have been detected with the multidetector INDRA. Complete information concerning the deexcitation properties of quasi-projectiles, including second moments of chemical composition, is compared to a quantum statistical model describing a gas of fermions and bosons in thermal and chemical equilibrium. Inclusions in the calculation of all known discrete levels of nuclear species which deexcite into light particles and of a final state excluded volume interaction are found decisive to very well reproduce the experimental data, which strongly supports that thermodynamical equilibrium was achieved at freeze-out for such sources. Received: 6 April 1999 |
| Keywords: | PACS: 25.70.-z Low and intermediate energy heavy-ion collisions – 24.60.-k Statistical theory and fluctuations – 25.70.Pq Multifragment emission and correlations |
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