Correlations between isospin dynamics and Intermediate Mass Fragments   emission time scales: a probe for the symmetry energy in asymmetric nuclear   matter
  We show new data from the $^{64}$Ni+$^{124}$Sn and $^{58}$Ni+$^{112}$Sn reactions studied in direct kinematics with the CHIMERA detector at INFN-LNS and compared with the reverse kinematics reactions at the same incident beam energy (35 A MeV). Analyzing the data with the method of relative velocity correlations, fragments coming from statistical decay of an excited projectile-like (PLF) or target-like (TLF) fragments are discriminated from the ones coming from dynamical emission in the early stages of the reaction. By comparing data of the reverse kinematics experiment with a stochastic mean field (SMF) + GEMINI calculations our results show that observables from neck fragmentation mechanism add valuable constraints on the density dependence of symmetry energy. An indication is found for a moderately stiff symmetry energy potential term of EOS. 
E. De Filippo, F. Amorini, L. Auditore, V. Baran, I. Berceanu, G.   Cardella, M. Colonna, E. Geraci, S. Gian\`i, L. Grassi, ...
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