Abstract
We have studied fragmentation properties of projectiles in peripheral heavy-ion collisions within a statistical ensemble approach. Distributions of projectile fragments are calculated for the reaction systems 86 Kr on 58;64 Ni and are compared to the experimental data for the same reactions at projectile energy of 15 MeV/nucleon. We assume that the projectile nuclei capture many neutrons from the targets as a result of the multinucleon transfer reactions (direct and fast reactions) at the first step of the dynamical stage of the collisions, and then the excited spectators are formed during the preequilibrium process (multistep reactions) long before the statistical equilibrium stage, and the deexcitation processes for the hot sources are simulated within the statistical multifragmentation model. It is seen that predicted results are in satisfactory agreement with experimental data.
Highlights
The properties of exotic nuclei close to the neutron dripline are important to provide information about the evolution of nuclear structure and nucleosynthesis [1,2]
We investigate the applicability of the statistical multifragmentation model (SMM) [13] in the transition region between the Coulomb barrier and Fermi energy regime
We analyzed the reactions 86 Kr +64 Ni and 86 Kr + 58 Ni at 15 MeV/nucleon on the basis of the SMM. It is clear from the comparison with the experimental data that SMM ensemble calculations combined with multinucleon transfer models may reproduce the experimental data even at low energies between the Coulomb barrier and Fermi energy regime
Summary
The properties of exotic nuclei close to the neutron dripline are important to provide information about the evolution of nuclear structure and nucleosynthesis [1,2]. Beside the low-energy fission reactions of heavy nuclei, neutron-rich nuclei are produced by proton stripping in nuclear fragmentation reactions of relativistic heavy projectiles [5,6]. Statistical model In the literature, there are various models to describe the nuclear multifragmentation mechanism according to the excitation energy deposited in projectile sources In these models, if the excitation energy per nucleon is less than 1 MeV/nucleon, the decay modes are generally described by the collective modes of compound atomic nuclei. In one of our previous studies, we fully described this procedure in terms of excitation energy as a function of mass of the excited fragments of ensemble of sources [14]
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