Ejection of energetic 7*Li ions produced in 10B(n, α)7*Li reaction from boron coated silicon wafer

The spectral lines of the 478 keV prompt γ-ray from7*Li produced in the 10B(n, α) 7*Li reaction were measured for a silicon wafer coated with a thin boron layer using neutron beams. The shapes of the Doppler broadened lines were found to depend greatly on the angle between the measurement axis and the boron layer surface. The angular dependence was interpreted according to whether the energetic 7*Li ions are ejected into air or into the substance in the forward or backward recoil of 7*Li to the γ-ray detector. (author). 6 refs., 5 figs., 1 tab