Proton Recoil Fast-Neutron Spectrometer. Part II. Experimental

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Abstract
A triple‐coincidence‐type proton recoil spectrometer has been developed for measuring neutron spectra of reactors and artificial neutron sources. The instrument is composed of a triple‐section proportional counter with suitable radiator‐absorber wheels, amplifiers, electronic pulse‐height selectors, and a triple‐coincidence circuit. Considerable effort has been made to obtain maximum sensitivity by optimizing the radiator and absorber thicknesses and the counting times, and by minimizing the background effects. Under these conditions the energy resolution obtained approaches that obtained by photographic plates. The spectrometer was calibrated by measuring monoenergetic neutrons from the O. R. N. L. Van de Graaff generator. Typical examples of spectra measurements are included.

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