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The isoscaling is investigated using the fragment yield data from fullyreconstructed quasi-projectiles observed in peripheral collisions of 28Si with124,112Sn at projectile energies 30 and 50 MeV/nucleon. The excitation energydependence of the isoscaling parameter beta_prime is observed which isindependent of beam energy. For a given quasi-projectile produced in reactionswith different targets no isoscaling is observed. The isoscaling thus reflectsthe level of N/Z-equilibration in reactions with different targets representedby the initial quasi-projectile samples. The excitation energy dependence ofthe isoscaling parameter beta_prime, corrected for the trivial 1/T temperaturedependence, does not follow the trend of the homogeneous system above 4MeV/nucleon thus possibly signaling the onset of separation into isospinasymmetric dilute and isospin symmetric dense phase.Comment: 4 pages, 4 figures, RevTeX, to appear in Physical Review

Isoscaling in peripheral nuclear collisions around the Fermi energy and a signal of chemical separation from its excitation energy dependence