Abstract
A new absolute counter for thermal and cold neutron beams has been built, based on the counting of prompt gamma rays from a boron target that totally absorbs the impinging neutrons. The system can be calibrated by two independent methods without reference to either the boron sample mass or the 10B reaction cross section. Both calibration methods are potentially capable of approaching the accuracy level of ±0.1% (1 σ). In the calibration experiments, the totally absorbing boron target is replaced by a thin 10B target, and either (1) alpha-gamma coincidence counting or (2) calibration by standard alpha sources is used to derive the efficiency of the gamma counter per neutron impinging on the totally absorbing target. Systematic corrections and estimated residual uncertainties are discussed.
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