Model for Glauber-type calculations of beam fragmentation at low energies*

Abstract In this study, a Glauber-type model for describing nuclear fragmentation in light targets at energies below 100 MeV is presented. It is developed based on the Glauber model within the nucleon transparent limit, in which the Lorentz-invariant phase space factor is introduced to account for energy and momentum conservation. Accordingly, the scope of the applicability of the model is discussed. The longitudinal momentum distributions of the most neutron-rich nuclei ( 10 Be, 9 Li, and 8 He), which were produced in a few nucleon removal reactions during the 11 B fragmentation of a Be target at beam energies of 10, 30, and 100 MeV, are calculated. The results of the calculations are then compared to the predictions of statistical fragmentation models, such as the Goldhaber model. Using the new model, the asymmetric longitudinal momentum distributions at low energies are explained by the kinematical locus and geometry of the reaction.