Isoscaling in Peripheral Nuclear Collisions around the Fermi Energy and a Signal of Chemical Separation from its Excitation Energy Dependence

Abstract

The isoscaling is investigated using the fragment yield data from fully reconstructed quasi-projectiles observed in peripheral collisions of 28Si with 124,112Sn at projectile energies 30 and 50 MeV/nucleon. The excitation energy dependence of the isoscaling parameter beta_prime is observed which is independent of beam energy. For a given quasi-projectile produced in reactions with different targets no isoscaling is observed. The isoscaling thus reflects the level of N/Z-equilibration in reactions with different targets represented by the initial quasi-projectile samples. The excitation energy dependence of the isoscaling parameter beta_prime, corrected for the trivial 1/T temperature dependence, does not follow the trend of the homogeneous system above 4 MeV/nucleon thus possibly signaling the onset of separation into isospin asymmetric dilute and isospin symmetric dense phase.

arXiv comment4 pages, 4 figures, RevTeX, to appear in Physical Review C

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• Effect of neutron skin thickness on projectile fragmentation
• Density dependence of the "symmetry energy" in the lattice gas model
• Isoscaling in statistical fragment emission in an extended compound nucleus model
• Dynamical aspects of isotopic scaling
• Statistical and dynamical aspects in the decay of hot neutron-rich nuclei