Abstract
The results of the analysis of the reactions 78,86Kr +40,48 Ca at 10 AMeV are presented. The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) in Catania by using the 4π multidetector CHIMERA, with beams delivered by the Superconductive Cyclotron. The competition among the various disintegration paths and in particular the isospin effects on the decay modes of the produced composite systems are investigated; this provides information about fundamental nuclear quantities such as level density, fission barrier and viscosity. Different isotopic composition and relative richness are observed among the reaction products of the two systems. An odd-even staggering effect is present in the charge distributions, in particular for the light fragments produced by the neutron-poor system. The kinematical characteristics of the IMF seem to indicate a high degree of the relaxation of the formed system. Besides, global features analysis seems to show some differences in the contribution arising from the various reaction mechanisms for the two reactions.
Highlights
Nuclear reactions between medium-mass nuclei at low energy domain are characterized by the competition between binary processes and compound nucleus de-excitations
The mean values of the velocity of the Intermediate Mass Fragments (IMF) in the center of mass frame, that are independent of the emission angle, show a quasilinear decrease increasing the atomic number and they are well reproduced by the values predicted by the systematic of Viola, with the Hinde’s correction for the asymmetric fission [8]
Besides the angular distributions of the IMF and the other Fission Fragments (FF), in the center of mass frame, follow a 1/sinθc.m. behavior as it is shown in right hand panel of the figure 2
Summary
Nuclear reactions between medium-mass nuclei at low energy domain are characterized by the competition between binary processes and compound nucleus de-excitations. The isospin plays a crucial role in the competition between these decay channels, novel information on fundamental nuclear quantities such as level density, fission barrier and viscosity could be extracted across the long isotopic chains of compound nuclei, extending from the neutron-rich to neutron-poor side. The neutron richness influence on the formation and decay modes of compound nuclei 118Ba and 134Ba, produced respectively in the 78Kr +40 Ca and 86Kr +48 Ca reactions at 10 AMeV are investigated [1, 2]. The experiment was performed by using the 4π multidetector, for charge particles, CHIMERA [3], allowing precise measurements of velocity, angular distributions and a good identification [4] of the reaction products with low energy thresholds
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