Fragment emission pattern in central and semi-central heavy-ion collisions
1995; Elsevier BV; Volume: 584; Issue: 4 Linguagem: Inglês
10.1016/0375-9474(94)00771-e
ISSN1873-1554
AutoresF. Schüßler, H. Nifenecker, B. Jakobsson, V. Kopljar, K. Söderström, S. Leray, Cheryl Ngo, S. R. Souza, J.P. Bondorf, Kim Sneppen,
Tópico(s)Quantum Chromodynamics and Particle Interactions
ResumoAbstract Event-by-event emission pattern of all charged fragments in central and semi-central, symmetric, semi-symmetric and asymmetric heavy-ion collisions at energies (50–220) A ·MeV have been studied in nuclear emulsions. The most central collisions, selected by momentum-tensor elongation and multiplicity criteria, exhibit one single fused source. Collective flow in this source is observed in symmetric (Kr + AgBr) collisions and weakly indicated in semi-symmetric (Ar + AgBr) collisions. Semi-central events exhibit quasi-target, quasi-projectile and participant or incomplete fusion sources from which no or very weak flow signals are observed. The emission from these sources is described by a Coulomb explosion model except for the fact that sub-Coulomb barrier fragments are frequent.
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