MOMENTUM DISTRIBUTIONS OF LOOSELY-BOUND NEUTRONS WITH THE PERIPHERAL DIRECT REACTION MODEL

We propose a peripheral direct reaction model for the projectile fragmentation of high-energy heavy-ion collisions. Our model is shown to be identical with the Serber model in calculating the total cross section for the one-nucleon stripping reaction of the deuteron. The model is applied to the transverse momentum distributions of 10Be fragments from the 11Be+C reaction taking into account the loosely-bound nature of the 1s12 orbit. The observed sharp peak at the transverse momentum transfer kT ≅ 0 is well reproduced by using the single-particle wave function of the 1s12 state calculated with a constraint for the separation energy. The long tail under the peak up to kT ≅ 200 MeV/c is explained as the contributions from the particle-stable excited states in 10Be. The magnitude of the absolute cross section is also reproduced reasonably well. © 1990.