Phys. Rev. C 49, 284 - 297 (1994)Lifetimes of well characterized hot nuclei via small-angle particle-particle correlations: 40Ar+Ag (E/A=7.8 and 17 MeV) |
A. Elmaani, John M. Alexander, N. N. Ajitanand, and Roy A. Lacey
Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794
S. Kox, E. Liatard, F. Merchez, T. Motobayashi, B. Noren, C. Perrin, D. Rebreyend, and Tsan Ung Chan
Institut des Sciences Nucléaires de Grenoble, IN2P3-Centre National de la Recherche Scientifique/Université Joseph Fourier, 53 Avenue des Martyrs, F 38026, Grenoble CEDEX, France
G. Auger and S. Groult
Grand Accelerateur National d’Ions Lourds, Boite Postale 5027, 14021 Caen CEDEX, France
Received 11 May 1993
Particle-particle correlations are studied for large- and small-angle separations for the reactions 312 and 680 MeV 40Ar+natAg. The spectral shapes and angular ansiotropies allow a characterization of the effective temperatures and spin zones of the hot nuclear emission sources. Small-angle correlations are compared to reaction simulations that employ various parametrizations for the emission time scales. We conclude that the initial lifetime scale for 1,2,3H particle evaporation is of the order of 10-22 s. These times are so short as to suggest a breakdown of the concept of ‘‘sequential evaporation,’’ for which a new ansatz is explored.
©1994 The American Physical Society
URL: http://link.aps.org/abstract/PRC/v49/p284
DOI: 10.1103/PhysRevC.49.284
PACS: 21.10.Tg, 25.70.Pq
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