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

Abstract

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.

arXiv comment4 pages, 3 figures, submitted to Phys. Rev. Lett

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• A Giant Halo at the Neutron Drip Line
• Density dependent hadron field theory for asymmetric nuclear matter and exotic nuclei
• Modified Empirical Parametrization of Fragmentation Cross Sections
• 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
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Cited by in corpus (21)

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• Isotopic Scaling of Heavy Projectile Residues from the collisions of 25 MeV/nucleon 86Kr with 124Sn, 112Sn and 64Ni, 58Ni
• Probing the density dependence of the symmetry potential with peripheral heavy-ion collisions
• Heavy Residue Isoscaling as a Probe of the Symmetry Energy of Hot Fragments
• Tracing the evolution of the symmetry energy of hot nuclear fragments from the compound nucleus towards multifragmentation
• Projectile fragmentation reactions and production of nuclei near the neutron drip-line
• Enhanced nucleon transfer in tip collisions of ${}^{238}$U+${}^{124}$Sn
• Isoscaling Studies of Fission - a Sensitive Probe into the Dynamics of Scission
• Production of new neutron-rich heavy nuclei with $Z=56-80$ in the multinucleon transfer reactions of ${}^{136}$Xe+${}^{198}$Pt
• Density and temperature dependence of nucleon-nucleon elastic cross section
• Effect of nuclear periphery on nucleon transfer in peripheral collisions
• Microscopic dynamics simulations of multi-nucleon transfer in ${}^{86}$Kr+${}^{64}$Ni at 25 MeV/nucleon
• Neutron-rich rare isotope production with stable and radioactive beams in the mass range A=40-60 at beam energy around 15 MeV/nucleon
• Effect of neutron skin thickness on projectile fragmentation
• Identification of medium mass (A=60-80) ejectiles from 15 MeV/nucleon peripheral heavy-ion collisions with the MAGNEX large-acceptance spectrometer
• Neutron-rich rare isotope production from projectile fission of heavy beams in the energy range of 20 MeV/nucleon
• Asymmetry of velocity distributions in peripheral collisions at Fermi energies
• Improvement on Fermionic properties and new isotope production in molecular dynamics simulations
• Production of cold fragments in nucleus-nucleus collisions in the Fermi-energy domain
• Dynamical aspects of isotopic scaling