Abstract
The same hot nuclear system (\ensuremath{\Sigma}Z=18) has been studied for two different entrance channels with reaction products detected in a forward array of scintillators: central collisions of $^{24}\mathrm{Mg}$ on a $^{12}\mathrm{C}$ target at 25A and 35A MeV and peripheral pickup reactions of $^{35}\mathrm{Cl}$ on a $^{197}\mathrm{Au}$ target at 43A 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 $^{24}\mathrm{Mg}$${+}^{12}$C at 35A MeV is well characterized by a dissipative binary collision scenario. Data at 25A MeV show less evidence of such dynamical characteristics. The intermediate-mass fragments (3\ensuremath{\le}Z\ensuremath{\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 25A MeV and the pickup reaction at 43A 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. \textcopyright{} 1996 The American Physical Society.
Published Version
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