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The scaling of the yields of heavy projectile residues from the reactions of25 MeV/nucleon 86Kr projectiles with 124Sn,112Sn and 64Ni, 58Nitargets isstudied. Isotopically resolved yield distributions of projectile fragments inthe range Z=10-36 from these reaction pairs were measured with the MARS recoilseparator in the angular range 2.7-5.3 degrees. The velocities of the residues,monotonically decreasing with Z down to Z~26-28, are employed to characterizethe excitation energy. The yield ratios R21(N,Z) for each pair of systems arefound to exhibit isotopic scaling (isoscaling), namely, an exponentialdependence on the fragment atomic number Z and neutron number N. The isoscalingis found to occur in the residue Z range corresponding to the maximum observedexcitation energies. The corresponding isoscaling parameters are alpha=0.43 andbeta=-0.50 for the Kr+Sn system and alpha=0.27 and beta=-0.34 for the Kr+Nisystem. For the Kr+Sn system, for which the experimental angular acceptancerange lies inside the grazing angle, isoscaling was found to occur for Z<26 andN<34. For heavier fragments from Kr+Sn, the parameters vary monotonically,alpha decreasing with Z and beta increasing with N. This variation is found tobe related to the evolution towards isospin equilibration and, as such, it canserve as a tracer of the N/Z equilibration process. The present heavy-residuedata extend the observation of isotopic scaling from the intermediate massfragment region to the heavy-residue region. Such high-resolution massspectrometric data can provide important information on the role of isospin inperipheral and mid-peripheral collisions, complementary to that accessible frommodern large-acceptance multidetector devices.Comment: 8 pages, 6 figures, submitted to Phys. Rev.

physical review. c. nuclear physics/physical review. c, nuclear physics

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Isotopic scaling of heavy projectile residues from the collisions of25MeV/nucle