Abstract
Differential cross sections for elastic p 6,8He and p 8,9Li scattering at energies between 60 and 70 MeV per nucleon and at the energy of 700 MeV per nucleon were calculated. The calculations in question were performed with the wave functions found on the basis of the α–n–n (for 6He), α–t–n (for 8Li), and α–t–2n (for 9Li) three-body models and with the density from the large-scale shell model for the 8He nucleus. The respective matrix elements were derived either upon taking fully into account the multiple-scattering operator or in the optical-limit approximation. A comparison of the results of the precise and approximate calculations made it possible to estimate reliably the contribution of higher multiplicity collisions to the differential cross sections.