Showing papers by "R. Dayras published in 2009"
TL;DR: New analyses of experimental data from Au on Au collisions at 60, 80, and 100 MeV/nucleon showing that bimodality is largely independent of the data selection procedure and of entrance channel effects are presented.
Abstract: The charge distribution of the heaviest fragment detected in the decay of quasiprojectiles produced in intermediate energy heavy-ion collisions has been observed to be bimodal. This feature is expected as a generic signal of phase transition in nonextensive systems. In this Letter, we present new analyses of experimental data from Au on Au collisions at 60, 80, and 100 MeV/nucleon showing that bimodality is largely independent of the data selection procedure and of entrance channel effects. An estimate of the latent heat of the transition is extracted.
51 citations
TL;DR: Isospin diffusion in semi-peripheral collisions is probed as a function of the dissipated energy by studying two systems over the incident energy range 52-74\AM as discussed by the authors.
Abstract: Isospin diffusion in semi-peripheral collisions is probed as a function of the dissipated energy by studying two systems $^{58}Ni$+$^{58}Ni$ and $^{58}Ni$+$^{197}Au$, over the incident energy range 52-74\AM. A close examination of the multiplicities of light products in the forward part of phase space clearly shows an influence of the isospin of the target on the neutron richness of these products. A progressive isospin diffusion is observed when collisions become more central, in connection with the interaction time.
39 citations
TL;DR: In this paper, the role of the N/Z ratio on the decay modes of compound nuclei was investigated in the context of the transition state model, and data were discussed in the framework of transition state models.
Abstract: Investigations into the role of the N/Z ratio on the decay modes of compound nuclei are presented. Characteristics of fragments with atomic number 6⩽Z⩽28 and light charged particles emitted in 78,82Kr+40Ca at 5.5 MeV/A reactions were measured at the GANIL facility using the 4π‐INDRA array. Data are compatible with an emission process from a compound nucleus. Persistence of structure effects and emission before full separation of fission fragments are evidenced from elemental cross‐sections and coincidence data between light charged particles and fragments. Data are discussed in the framework of the transition state model.
2 citations