Abstract
The study of the decay modes competition of the compound systems produced in the collisions 78Kr+40Ca and 86Kr+48Ca at 10AMeV is presented. In particular, the N/Z entrance channel influence on the decay paths of the compound systems, directly connected to the isospin influence, is investigated. The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) in Catania by using the 4π multi-detector CHIMERA. Charge, mass, angular distributions and kinematical features of the reaction products were studied. The analysis shows some differences in the contribution arising from the various reaction mechanisms for the neutron poor and neutron rich systems. Comparison with theoretical statistical and dynamical models are presented for the two systems. Besides a study of the influence of the energy on the entrance channel is performed for the 78Kr+40Ca reaction, by comparing the results of this experiment to those obtained for the same system at 5.5 AMeV with the INDRA device at GANIL.
Highlights
One of the principal aim in the field of the nuclear reactions is the study of the influence of the entrance channel N/Z ratio, directly connected to the isospin degree of freedom, on the reaction mechanism and on the formation of the fragments in the exit channel.In this context, particular interest is focused on the heavy-ion reactions at low energy (E/A< 10-15 AMeV), where for medium-mass systems the fusion processes are predominant
The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) in Catania by using the CHIMERA detector
One can see the different isotopic composition and relative enrichment in correspondence of the same Z, for the compared systems. In particular this effect is evident for the Be element, in which the isotopic composition goes from A=7, 9, in the n-poor system, to A= 9,10, in the n-rich one
Summary
One of the principal aim in the field of the nuclear reactions is the study of the influence of the entrance channel N/Z ratio, directly connected to the isospin degree of freedom, on the reaction mechanism and on the formation of the fragments in the exit channel In this context, particular interest is focused on the heavy-ion reactions at low energy (E/A< 10-15 AMeV), where for medium-mass systems the fusion processes are predominant. The two investigated systems are different for 16 neutrons, the maximum difference that we can get by using stable nuclei; this allows to produce compound nuclei with similar both spin distribution and excitation energy in a large domain of N/Z (from 1.11 to 1.39) Such a set of data will provide new constraint on sophisticated models attempting to describe statistical and/or dynamical properties [2] of excited nuclei
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