Projectile fragmentation reactions and production of nuclei near the neutron drip-line

Abstract

The reaction mechanism of projectile fragmentation at intermediate energies has been investigated observing the target dependence of the production cross sections of very neutron-rich nuclei. Measurement of longitudinal momentum distributions of projectile-like fragments within a wide range of fragment mass and its charge was performed using a hundred-MeV/n ${}^{40}$Ar beam incident on Be and Ta targets. By measurement of fragment momentum distribution, a parabolic mass dependence of momentum peak shift was observed in the results of both targets, and a phenomenon of light-fragment acceleration was found only in the Be-target data. The analysis of production cross sections revealed an obvious enhancement of the target dependence except target size effect when the neutron excess is increased. This result implies the breakdown of factorization (BOF) of production cross sections for very neutron-rich nuclei near the drip line.

16 pages, 18 figures, submitted to Phys. Rev. C

References in corpus (4)

• Modified Empirical Parametrization of Fragmentation Cross Sections
• Enhanced Production of Neutron-Rich Rare Isotopes in Peripheral Collisions at Fermi Energies
• Heavy Residue Isoscaling as a Probe of the Process of N/Z Equilibration
• Spectator Response to the Participant Blast

Cited by in corpus (6)

• Transport Model Simulations of Projectile Fragmentation Reactions at 140 MeV/nucleon
• Neutron drip line and the equation of state of nuclear matter
• Neutron-rich rare isotope production with stable and radioactive beams in the mass range A=40-60 at beam energy around 15 MeV/nucleon
• Symmetry energy, unstable nuclei, and neutron star crusts
• Asymmetry of velocity distributions in peripheral collisions at Fermi energies
• Activation of momentum fluctuations in wave packet molecular dynamics: Impacts on momentum distributions of projectilelike fragments