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Energetic proton emission in heavy ion collisions at intermediate energy: Pre-equilibrium and cooperative effects |
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| Authors: | P. Sapienza R. Coniglione M. Colonna E. Migneco C. Agodi R. Alba G. Bellia A. Del Zoppo R. Finocchiaro V. Greco K. Loukachine C. Maiolino P. Piattelli D. Santonocito P. G. Ventura Y. Blumenfeld M. Bruno N. Colonna M. D’Agostino L. Fabbietti M. L. Fiandri F. Gramegna I. Iori G. V. Margagliotti P. F. Mastinu P. M. Milazzo A. Moroni R. Rui J. A. Scarpaci G. Vannini |
| Affiliation: | 1. INFN-Laboratorio Nazionale del Sud, I-95123, Catania, Italy 2. Dipartimento di Fisica dell’Università di Catania, I-95100, Catania, Italy 3. Institut de Physique Nucléaire, IN2P3-CNRS, F-91406, Orsay, France 4. INFN and Dipartimento di Fisica dell’Università di Bologna, I-40126, Bologna, Italy 5. INFN-Sezione di Bari, I-70126, Bari, Italy 6. INFN-Sezione di Milano, I-20133, Milano, Italy 7. INFN-Laboratori Nazionali di Legnaro, I-35020, Legnaro (Padova), Italy 8. INFN-Sezione di Trieste, I-34127, Trieste, Italy |
| Abstract: | Energetic proton emission has been investigated as a function of the centrality in the reaction 58Ni + 58Ni at 30 AMeV. Protons with energy extending up to a relevant fraction of the total available energy in the reaction were measured and studied. The dependence on the reaction centrality has been extensively investigated and data have been compared with the results of microscopic transport calculations. The more striking observation concerns the extremely energetic proton (ENN P ≥ 130 MeV) multiplicity which is found to increase almost quadratically with the number of participant nucleons thus indicating the onset of a mechanism beyond one and two-body dynamics. |
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