Neutron multiplicity distributions for 200 MeV proton-, deuteron- and 4He-induced spallation reactions on thick Pb targets

Inclusive neutron multiplicity distributions associated with 197 MeV proton-, 188 MeV deuteron- and 214 MeV 4He-induced spallation reactions on thick (1=2-25 cm) Pb targets are presented, together with distributions associated with nuclear-reaction events. The mean neutron multiplicity per incident particle, , which is a crucial parameter for applications on accelerator-driven neutron sources, has been obtained for various conditions. For the thickest targets used in this work, all distribution characteristics are found nearly identical for reactions induced by protons and deuterons. (author)