⁶Li(n,α)T Cross Section from 70 to 3000 keV from the ²³⁵U(n,f) Calibration of a Thin Glass Scintillator

The efficiency of a 0.5-mm-thick ⁶Li glass scintillation monitor was determined above the “1/v” region by comparison with the counting rate of a ten-plate ²³⁵U fission ionization chamber in a neutron beam from the Oak Ridge Electron Linear Accelerator. The chief difference in derived ⁶Li(n,α) cross sections from the ENDF/B-V evaluation is a slightly greater width (∼8%) of the prominent resonance peaking near 240 keV and a higher cross section in the wings. The steep rise in efficiency from 3500 to 5000 keV is attributed primarily to the ¹⁶O(n, α) reaction.