IMF isotopic properties in semi-peripheral collisions at Fermi energies

Abstract

We study the neutron and proton dynamical behavior along the fragmentation path in semi-peripheral collisions: 58Fe+58Fe (charge asymmetric, N/Z = 1.23) and 58Ni+58Ni (charge symmetric, N/Z = 1.07), at 47 AMeV. We observe that isospin dynamics processes take place also in the charge-symmetric system 58Ni+58Ni, that may produce more asymmetric fragments. A neutron enrichment of the neck fragments is observed, resulting from the interplay between pre-equilibrium emission and the phenomenon of "isospin-migration". Both effects depend on the EoS (Equation of State) symmetry term. This point is illustrated by comparing the results obtained with two different choices of the symmetry energy density dependence. New correlation observables are suggested, to study the reaction mechanism and the isospin dynamics.

5 pages, 8 figures, Revtex4 Latex Style

References in corpus (4)

• Reaction Dynamics with Exotic Beams
• Isospin Transport at Fermi Energies
• Symmetry energy and the isospin dependent equation of state
• Energetics of midvelocity emissions in peripheral heavy ion collisions at Fermi energies

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