Isospin Against Size Effects In Projectile Dynamical Fission For ~(112,124)Sn+~(58,64)Ni and ~(124)Xe+~(64)Zn Reactions At 35 A.MeV

摘要

In past experiments, mass asymmetric projectile-target combinations ~(124)Sn+~(64)Ni and ~(112)Sn+~(58)Ni were investigated at E_(Lab)(~(112,124)Sn)=35 A.MeV beam energy by using the 4π multi-detector CHIMERA. From a quantitative comparison of cross sections associated to Statistical and Dynamical Fission of the Projectile-Like Fragments, it resulted that Dynamical Fission process is about two times more probable in the neutron rich ~(124)Sn+~(64)Ni system than in the ~(112)Sn +~(58)Ni neutron poor one. In contrast, no sizable difference was found for Statistical Fission mechanism. The observed difference in the strength of the Dynamical effects could arise from the difference in entrance channel Isospin (N/Z) content. In order to disentangle Isospin effects from effects due to the different masses of the two systems, a new experiment ~(124)Xe+~(64)Zn at 35 A.MeV beam energy has been recently carried out.