Total neutron yields from 100 MeV protons on Pb and 7Li targets

The neutron yield per proton from thick targets of Pb and 7Li irradiated with 100 MeV protons has been measured and calculated. The water bath method was used to measure the neutron production and a Faraday cup was used to measure the proton beam current. Measured yields are 0.343 +- 0.021 for Pb and 0.123 +- 0.007 for 7Li. Corresponding yields calculated with the nucleon-meson transport code NMTC are 0.363 +- 0.002 and 0.160 +- 0.001. Measured and calculated thermal neutron distributions in the water bath are also compared. (orig.)