Enhanced Production of Neutron-Rich Rare Isotopes in Peripheral Collisions at Fermi Energies

Details Enhanced Production of Neutron-Rich Rare Isotopes in Peripheral Collisions at Fermi Energies Enhanced Production of Neutron-Rich Rare Isotopes in Peripheral Collisions at Fermi Energies

2003-02-11

arxiv.org/abs/nucl-ex/0302011v2

Phys.Rev.Lett. 91 (2003) 022701

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.022701

A large enhancement in the production of neutron-rich projectile residues is observed in the reactions of a 25 MeV/nucleon 86Kr beam with the neutron rich 124Sn and 64Ni targets relative to the predictions of the EPAX parametrization of high-energy fragmentation, as well as relative to the reaction with the less neutron-rich 112Sn target. The data demonstrate the significant effect of the target neutron-to-proton ratio (N/Z) in peripheral collisions at Fermi energies. A hybrid model based on a deep-inelastic transfer code (DIT) followed by a statistical de-excitation code appears to account for part of the observed large cross sections. The DIT simulation indicates that the production of the neutron-rich nuclides in these reactions is associated with peripheral nucleon exchange. In such peripheral encounters, the neutron skins of the neutron-rich 124Sn and 64Ni target nuclei may play an important role. From a practical viewpoint, such reactions between massive neutron-rich nuclei offer a novel and attractive synthetic avenue to access extremely neutron-rich rare isotopes towards the neutron-drip line.

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