MOMENTUM DISTRIBUTION OF FRAGMENTS IN REACTIONS INDUCED BY NEUTRON-RICH NUCLEI

We calculate the longitudinal and transverse momentum distributions of the fragments Li-9, Be-10 and Be-12 emitted in the reactions induced by the neutron rich nuclei Li-11, Be-11 and Be-14 respectively on seve ral targets at different beam energies within a direct fragmentation m odel. For all the cases, the shapes of the longitudinal momentum distr ibutions are found to depend very weakly on the interactions governing the fragmentation. However, both widths and the absolute magnitudes o f the transverse momentum distributions are sensitive to the fragment- target interactions. Comparisons with the recent experimental data are made to support our conclusions.