Dynamical aspects of isotopic scaling

Abstract

Investigation of the effect of the dynamical stage of heavy-ion collisions indicates that the increasing width of the initial isospin distributions is reflected by a significant modification of the isoscaling slope for the final isotopic distributions after de-excitation. For narrow initial distributions, the isoscaling slope assumes the limiting value of the two individual initial nuclei while for wide initial isotopic distributions the slope for hot fragments approaches the initial value. The isoscaling slopes for final cold fragments increase due to secondary emissions. The experimentally observed evolution of the isoscaling parameter in multifragmentation of hot quasiprojectiles at E${}_{inc}$=50 AMeV, fragmentation of ${}^{86}$Kr projectiles at E${}_{inc}$=25 AMeV and multifragmentation of target spectators at relativistic energies was reproduced by a simulation with the dynamical stage described using the appropriate model (deep inelastic transfer and incomplete fusion at the Fermi energy domain and spectator-participant model at relativistic energies) and the de-excitation stage described with the statistical multifragmentation model. In all cases the isoscaling behavior was reproduced by a proper description of the dynamical stage and no unambiguous signals of the decrease of the symmetry energy coefficient were observed.

arXiv commentLaTeX, 18 pages, 9 figures, to appear in Phys. Rev. C

References in corpus (11)

• Isotopic Scaling in Nuclear Reactions
• Isoscaling in Light-Ion Induced Reactions and its Statistical Interpretation
• Isotopic Scaling and the Symmetry Energy in Spectator Fragmentation
• Isotopic Scaling of Heavy Projectile Residues from the collisions of 25 MeV/nucleon 86Kr with 124Sn, 112Sn and 64Ni, 58Ni
• Enhanced Production of Neutron-Rich Rare Isotopes in Peripheral Collisions at Fermi Energies
• Isoscaling Studies of Fission - a Sensitive Probe into the Dynamics of Scission
• Effect of nucleon exchange on projectile multifragmentation in the reactions of 28Si + 112Sn and 124Sn at 30 and 50 MeV/nucleon
• Heavy Residue Isoscaling as a Probe of the Process of N/Z Equilibration
• Isoscaling in Peripheral Nuclear Collisions around the Fermi Energy and a Signal of Chemical Separation from its Excitation Energy Dependence
• Effect of nuclear periphery on nucleon transfer in peripheral collisions
• Heavy Residues with A<90 in the Asymmetric Reaction of 20 AMeV 124Sn+27Al as a Sensitive Probe of the Onset of Multifragmentation

Cited by in corpus (3)

• Isospin effect in the statistical sequential decay
• Density dependence of the "symmetry energy" in the lattice gas model
• Statistical and dynamical aspects in the decay of hot neutron-rich nuclei