Isospin diffusion in heavy ion reactions

Using symmetric ¹¹²Sn + ¹¹²Sn, ¹²⁴Sn + ¹²⁴Sn collision as references, we probe isospin diffusion in peripheral asymmetric ¹¹²Sn + ¹²⁴Sn, ¹²⁴Sn + ¹¹²Sn systems at incident energy of E/A = 50 MeV. Isoscalic analyses imply that the quasi-projectile and quasi-target in these collisions do not achieve isospin equilibrum, permitting an assesment of the isospin transport rates. We find that comparisons between isospin sensitive experimental and theoretical obstacles, using suitably chosen scaled ratios, permit investigation of the density dependence of the asymmetry term of the nuclear equation of state.