Experimental determination of fragment excitation energies in multifragmentation events

Journal Article · Wed Jul 01 00:00:00 EDT 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.58.256· OSTI ID:638821

Marie, N; Natowitz, J B; Cibor, J; Hagel, K; Wada, R ^[1]; Chbihi, A; Le Fevre, A; Salou, S; Wieleczko, J P; Gingras, L; Auger, G; Laville, J L; Saint-Laurent, F; Tirel, O ^[2]; Assenard, M; Eudes, P; Germain, M; Rahmani, A; Reposeur, T ^[3]; Bacri, C O ; Borderie, B; Frankland, J D; Plagnol, E; Rivet, M F ^[4]; Bocage, F; Bougault, R; Brou, R; Colin, J; Cussol, D; Durand, D; Genouin-Duhamel, E; Lecolley, J F; Lefort, T; Le Neindre, N; Lopez, O; Louvel, M; Nguyen, A D; Peter, J; Steckmeyer, J C; Tamain, B; Vient, E ^[5]; Buchet, P; Charvet, J L; Dayras, R; Dore, D; Legrain, R; Nalpas, L; Volant, C ^[6]; Demeyer, A; Galichet, E; Gerlic, E; Guinet, D; Lautesse, P; Maskay, A M; Stern, M ^[7]; Parlog, M; Tabacaru, G ^[8]; Rosato, E ^[9]; Gourio, D ^[10]; Majka, Z ^[11]

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1. Cyclotron Institute, Texas AM University, College Station, Texas 77843-3366 (United States)
2. GANIL, CEA, IN2P3-CNRS, B.P. 5027, F-14021 Caen Cedex (France)
3. SUBATECH, Universite de NANTES, Ecole des Mines de NANTES, IN2P3-CNRS, F-44072 Nantes Cedex 03 (France)
4. Institut de Physique Nucleaire, IN2P3-CNRS, F-91406 Orsay Cedex (France)
5. LPC, IN2P3-CNRS, ISMRA et Universite, F-14050 Caen Cedex (France)
6. DAPNIA/SPhN, CEA/Saclay, F-91191 Gif sur Yvette Cedex (France)
7. IPN Lyon, IN2P3-CNRS et Universite, F-69622 Villeurbanne Cedex (France)
8. National Institute for Physics and Nuclear Engineering, RO-76900 Bucharest-Magurele (Romania)
9. Dipartimento di Scienze Fisiche, Univ. di Napoli, 180126 Napoli (Italy)
10. Gesellschaft fuer Schwerionenforschung, D-64291 Darmstadt (Germany)
11. Institute of Physics, Jagellonian University ul. Roeymonta 4, 30-059 Krakow (Poland)

For 50 MeV/nucleon {sup 129}Xe+{sup nat}Sn multifragmentation events, we deduced, by means of correlation techniques, the multiplicities of the hydrogen and helium isotopes which were emitted by the hot primary excited fragments produced at the stage of the disassembly of an equilibrated hot source. We also derived the relative kinetic energy distributions between the primary clusters and the light charged particles that they evaporate. From the comparison between the secondary multiplicities observed experimentally and the multiplicities predicted by the GEMINI model, we concluded that the source breaks into primary fragments which are characterized by the same N/Z ratio as the combined system. Knowing the secondary light charged particle multiplicities and kinetic energies, we reconstructed the average charges of the hot fragments and we estimated their mean excitation energies. The fragment excitation energies are equal to 3.0 MeV/nucleon for the full range of intermediate mass fragment atomic number. This global constancy indicates that, on the average, thermodynamical equilibrium was achieved at the disassembly stage of the source. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 638821
• Journal Information: Physical Review, C, Vol. 58, Issue 1; Other Information: PBD: Jul 1998
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
NUCLEAR FRAGMENTATION
NUCLEAR FRAGMENTS
TIN
XENON 129 REACTIONS
CORRELATIONS
KINETIC ENERGY
MULTIPLICITY
CHARGED PARTICLES
THERMAL EQUILIBRIUM