Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-11-23
Physics
Nuclear Physics
Nuclear Theory
34 pages, 15 figures, Nucl.Phys. A, in press
Scientific paper
10.1016/j.nuclphysa.2008.02.307
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.
Baran Václav
Colonna Maria
Rizzo J.
Toro Massimo Di
Wolter Hermann H.
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