Double differential neutron emission cross sections of10B AND11B at 6, 10 and 14 MeV and of6Li,7Li and12C at 14 MeV

Abstract

Abstract Neutron emission spectra of 10B and 11B were measured at 6, 10 and 14.1 MeV and those of 6Li, 7Li. and carbon at 14.1 MeV using time-of-flight techniques. Absolute double differential cross sections were obtained by using scattering from hydrogen as a cross section reference. Integration over energy ranges and solid angle yielded integrated elastic and total neutron emission cross sections. At 6 and 10 MeV excellent agreement with total cross section data is found; at 14.1 MeV the new data tend to be higher than expected. The biggest error source in the continuous spectra stems from uncertainties in the input library (ENDF/B-V) of the Monte Carlo correction for multiple scattering. In particular, the library for 11B appears to be very unrealistic, with a total elastic cross section at 14.1 MeV which should be higher by 50%.