Isobaric yield ratio difference between the 140 A MeV 58, 64Ni + 9Be reactions studied by antisymmetric molecular dynamics model
Abstract
[Background] The isobaric yield ratio difference (IBD) method is found to be sensitive to the density difference of neutron-rich nucleus induced reaction around the Fermi energy. [Purpose] An investigation is performed to study the IBD results in the transport model. [Methods] The antisymmetric molecular dynamics (AMD) model plus the sequential decay model GEMINI are adopted to simulate the 140A MeV 58, 64Ni + 9Be reactions. A relative small coalescence radius Rc = 2.5 fm is used for the phase space at t = 500 fm/c to form the hot fragment. Two limitations on the impact parameter (b1 = 0 - 2 fm and b2 = 0 - 9 fm) are used to study the effect of central collisions in IBD. [Results] The isobaric yield ratios (IYRs) for the large--A fragments are found to be suppressed in the symmetric reaction. The IBD results for fragments with neutron-excess I = 0 and 1 are obtained. A small difference is found in the IBDs with the b1 and b2 limitations in the AMD simulated reactions. The IBD with b1 and b2 are quite similar in the AMD + GEMINI simulated reactions. [Conclusions] The IBDs for the I = 0 and 1 chains are mainly determined by the central collisions, which reflects the nuclear density in the core region of the reaction system. The increasing part of the IBD distribution is found due to the difference between the densities in the peripheral collisions of the reactions. The sequential decay process influences the IBD results. The AMD + GEMINI simulation can better reproduce the experimental IBDs than the AMD simulation.
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