title: Strong enhancement of extremely energetic proton production in central heavy ion collisions at intermediate energy.
abstract: The energetic proton emission has been investigated as a function of the reaction centrality for the system (58)Ni + (58)Ni at 30A MeV. Extremely energetic protons (E(NN)(p) > or = 130 MeV) were measured and their multiplicity 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.
authors.affiliation: INFN--Laboratorio Nazionale del Sud, Via S. Sofia 44, I -95123 Catania, Italy.
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authors.lastname: Sapienza
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authors.initials: R
authors.lastname: Coniglione
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authors.lastname: Colonna
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authors.lastname: Migneco
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authors.lastname: Agodi
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authors.lastname: Bellia
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authors.lastname: Del Zoppo
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authors.lastname: Finocchiaro
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authors.lastname: Greco
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authors.lastname: Loukachine
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authors.lastname: Piattelli
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authors.lastname: Santonocito
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authors.lastname: Ventura
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authors.lastname: Blumenfeld
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authors.lastname: Bruno
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authors.lastname: Colonna
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authors.lastname: D'Agostino
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authors.lastname: Fabbietti
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authors.lastname: Fiandri
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authors.lastname: Gramegna
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authors.lastname: Iori
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authors.lastname: Margagliotti
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authors.lastname: Mastinu
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authors.lastname: Milazzo
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authors.lastname: Moroni
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authors.lastname: Rui
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authors.initials: JA
authors.lastname: Scarpaci
authors.forename: G
authors.initials: G
authors.lastname: Vannini