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We present a new experimental method to correlate the isotopic composition ofintermediate mass fragments (IMF) emitted at mid-rapidity in semi-peripheralcollisions with the emission timescale: IMFs emitted in the early stage of thereaction show larger values of $<$N/Z$>$ isospin asymmetry, stronger angularanisotropies and reduced odd-even staggering effects in neutron to proton ratio$<$N/Z$>$ distributions than those produced in sequential statistical emission.All these effects support the concept of isospin "migration", that is sensitiveto the density gradient between participant and quasi-spectator nuclear matter,in the so called neck fragmentation mechanism. By comparing the data to aStochastic Mean Field (SMF) simulation we show that this method gives valuableconstraints on the symmetry energy term of nuclear equation of state atsubsaturation densities. An indication emerges for a linear density dependenceof the symmetry energy.

Correlations between emission timescale of fragments and isospin dynamics in $^{124}$Sn+$^{64}$Ni and $^{112}$Sn+$^{58}$Ni reactions at 35 AMeV