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

abstract

  • The isoscaling is investigated using the fragment yield data from fully reconstructed quasiprojectiles 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 β′ is observed which is independent of beam energy. For a given quasiprojectile 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 quasiprojectile samples. The excitation energy dependence of the isoscaling parameter β′, 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.

author list (cited authors)

  • Veselsky, M., Souliotis, G. A., & Yennello, S. J.

citation count

  • 19

publication date

  • March 2004