Effect of nuclear periphery on nucleon transfer in peripheral collisions

Abstract

A comparison of experimental heavy residue cross sections from the reactions 86Kr+64Ni,112,124Sn with the model of deep-inelastic transfer (DIT) is carried out. A modified expression for nucleon transfer probabilities is used at non-overlapping projectile-target configurations, introducing a dependence on isospin asymmetry at the nuclear periphery. The experimental yields of neutron-rich nuclei close to the projectile are reproduced better and the trend deviating from the bulk isospin equilibration is explained. For the neutron-rich products further from the projectile, originating from hot quasiprojectiles, the statistical multifragmentation model reproduces the mass distributions better than the model of sequential binary decay. In the reaction with proton-rich target 112Sn the nucleon exchange appears to depend on isospin asymmetry of nuclear periphery only when surface separation is larger than 0.8 fm due to the stronger Coulomb interaction at more compact di-nuclear configuration.

arXiv commentLaTeX, 13 pages, 7 figures, to appear in Nuclear Physics A

References in corpus (8)

• 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
• Enhanced Production of Neutron-Rich Rare Isotopes in the Reaction of 25 MeV/nucleon Kr-86 on Ni-64
• Equation of state and phase transitions in asymmetric nuclear matter
• 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
• Heavy Residues with A<90 in the Asymmetric Reaction of 20 AMeV 124Sn+27Al as a Sensitive Probe of the Onset of Multifragmentation
• Production mechanism of hot nuclei in violent collisions in the Fermi energy domain

Cited by in corpus (4)

• Neutron-rich rare isotope production with stable and radioactive beams in the mass range A=40-60 at beam energy around 15 MeV/nucleon
• Identification of medium mass (A=60-80) ejectiles from 15 MeV/nucleon peripheral heavy-ion collisions with the MAGNEX large-acceptance spectrometer
• Production of cold fragments in nucleus-nucleus collisions in the Fermi-energy domain
• Dynamical aspects of isotopic scaling