Abstract
A method to unfold neutron spectra from experimental proton recoil data in the form of a Multi-Channel Pulse Height Analyzer Histogram is developed and tested. Since the energy spectrum of a neutron source is essentially the probability density function of the energy with which neutrons are emitted, the theory of random variables is used to develop the basic unfolding method. Time series analysis and Fourier analysis is subsequently applied to obtain smooth estimates of the neutron spectra. The method is tested by its application to experimental data produced with an NE-213 fast neutron spectrometer system and a Benjamin-type spectrometer system. Spectra of neutron sources such as Pu-Be and Cf-252 are unfolded. The spectral estimates are compared with calculations, published data and results obtained with other unfolding methods.
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