Dependence of intermediate mass fragment production on the reaction mechanism in light heavy-ion collisions at intermediate energy
- Departement de Physique, Laboratoire de Physique Nucleaire, Universite Laval, Quebec, G1K 7P4 (CANADA)
- AECL Research, Chalk River Laboratories, Ontario, K0J 1J0 (CANADA)
- Institut de Physique Nucleaire de Lyon, 46 Boulevard du 11 Novembre 1918, F-69622, Villeurbanne Cedex (France)
The same hot nuclear system ({Sigma}{ital Z}=18) has been studied for two different entrance channels with reaction products detected in a forward array of scintillators: central collisions of {sup 24}Mg on a {sup 12}C target at 25{ital A} and 35{ital A} MeV and peripheral pickup reactions of {sup 35}Cl on a {sup 197}Au target at 43{ital A} MeV. The detection-efficiency-corrected charge distributions, multiplicity of charged particles and cross sections as a function of excitation energy are compared. The reaction mechanism is investigated, through comparison to simulations with statistical observables. The central reaction {sup 24}Mg+{sup 12}C at 35{ital A} MeV is well characterized by a dissipative binary collision scenario. Data at 25{ital A} MeV show less evidence of such dynamical characteristics. The intermediate-mass fragments (3{le}{ital Z}{le}8) production for each reaction is compared to model calculations for different values of excitation energy. The systems formed in the central collision at 25{ital A} MeV and the pickup reaction at 43{ital A} MeV show similar source characteristics, both statistically and in momentum space. However, the yields of the various exit channels, from evaporation and/or fission to multifragmentation and vaporization, differ for the two reactions. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 278847
- Journal Information:
- Physical Review, C, Vol. 53, Issue 2; Other Information: PBD: Feb 1996
- Country of Publication:
- United States
- Language:
- English
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