Isospin fluctuations in spinodal decomposition

Details Isospin fluctuations in spinodal decomposition Isospin fluctuations in spinodal decomposition

2005-03-08

arxiv.org/abs/nucl-th/0503018v1

Phys. Rev. C71 (2005) 064605

Physics

Nuclear Physics

Nuclear Theory

18 RevTex4 pages, 6 eps figures

Scientific paper

10.1103/PhysRevC.71.064605

We study the isospin dynamics in fragment formation within the framework of an analytical model based on the spinodal decomposition scenario. We calculate the probability to obtain fragments with given charge and neutron number, focussing on the derivation of the width of the isotopic distributions. Within our approach this is determined by the dispersion of N/Z among the leading unstable modes, due to the competition between Coulomb and symmetry energy effects, and by isovector-like fluctuations present in the matter that undergoes the spinodal decomposition. Hence the widths exhibit a clear dependence on the properties of the Equation of State. By comparing two systems with different values of the charge asymmetry we find that the isotopic distributions reproduce an isoscaling relationship.

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