Isospin Dynamics in Peripheral Heavy Ion Collisions at Fermi Energies

Abstract

We present a detailed study of isospin dynamics in peripheral collisions at Fermi energies. We consider symmetric and mixed collisions of (124,112)Sn isotopes at 35 and 50 AMeV to study the isospin transport between the different reaction components (residues, gas and possibly intermediate mass fragments) and, in particular, the charge equilibration in the mixed system. We evaluate the effects of drift terms due to asymmetry and density gradients, which are directly related to the poorly known value and slope of the symmetry energy below saturation density. We verify the importance of an isoscalar momentum dependence of the mean field, which is found to influence the isospin transport since it changes the reaction times. We finally suggest two observables particularly sensitive to the isovector part of the nuclear equation-of-state: the correlation between isospin equilibration and kinetic energy loss for binary events, and the isospin content of the produced mid-rapidity fragments for neck fragmentation events.

34 pages, 15 figures, Nucl.Phys. A, in press

References in corpus (3)

• Neutron and Proton Transverse Emission Ratio Measurements and the Density Dependence of the Asymmetry Term of the Nuclear Equation of State
• Isospin Distillation with Radial Flow: a Test of the Nuclear Symmetry Energy
• The Dynamical Dipole Radiation in Dissipative Collisions with Exotic Beams

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• Isospin Distillation with Radial Flow: a Test of the Nuclear Symmetry Energy
• Isospin diffusion in semi-peripheral ${}^{58}Ni$ + ${}^{197}Au$ collisions at intermediate energies (II): Dynamical simulations
• Prompt dipole radiation in fusion reactions
• Competition between Coulomb and Symmetry Potential in Semi-peripheral Heavy-ion Collisions
• A new probe to study symmetry energy at low density by deuteron breakup reaction