ONE-NEUTRON AND 2-NEUTRON REMOVAL FROM THE RADIOACTIVE SECONDARY PROJECTILES NI-56 AND FE-52

A method for measuring the cross sections for the neutron removal from relativistic secondary projectiles by means of a two-stage magnetic s pectrometer is presented. Its application to the 1n- and 2n-removal fr om Ni-56 and Fe-52 at 470 A . MeV in an aluminum target is described. The results are compared to the intranuclear-cascade plus evaporation model and to the statistical abrasion-ablation model. The influence of the nuclear surface on the few-nucleon removal reactions is discussed . The neutron-removal cross sections are combined with total charge-ch anging cross sections to obtain the total interaction cross sections o f Ni-56 and Fe-52.