MEASUREMENT OF NEUTRON-PRODUCTION DOUBLE-DIFFERENTIAL CROSS SECTIONS FOR NUCLEAR SPALLATION REACTION INDUCED BY 0.8, 1.5 AND 3.0 GEV PROTONS

摘要

Neutron-production double-differential cross sections were measured for the spallation reaction induced by 0.8, 1.5 and 3.0 GeV protons on C, Al, Fe, In and Pb targets. The experiments were performed by time-of-flight technique with a typical flight path length of Im, and the cross sections were obtained with energy resolutions better than 8% at neutron energies below 100 MeV. The experimental data were compared with the results of calculation codes based on an intranuclear-cascade-evaporation model. Adoption of the in-medium effect on nucleon-nucleon cross section in the cascade calculation improves the agreement between the calculated results and experimental data particularly in the case of 0.8-GeV proton incidence. For protons above 1 GeV, however, the calculations typically twice overestimate the cross sections in the emitted neutron energy region of 10 to 30 MeV. [References: 30]