Abstract
A method to study the spectrum of the gamma rays emitted in radiative capture of fast neutrons has been developed. A sodium iodide scintillation spectrometer was employed and the use of time-of-flight techniques made it possible to reduce the background of scattered neutrons sufficiently. Nickel, silver and gold were studied with 0.1 MeV neutrons and a comparison with the gamma-ray spectra from the capture of thermal neutrons was made. The agreement was good for nickel and silver. In the case of gold the relative intensity of the high-energy gamma rays was lower for 0.1 MeV neutrons than for thermal neutrons.
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