Abstract
Abstract The neutron emission probability of the 241Am–Be neutron source at thermal energies had been measured using indium, gold, and manganese foils as monitors for thermal neutrons. The thermal flux up to cadmium cutoff energy was determined using cadmium covered monitors as well as bare monitors taking into account possible absorption and modifications of the neutron spectra from source to measurement point and the energy response of the monitors. Experimental value of the neutron emission probability of neutrons having energies below the 0.5 eV was found to be ( 3 . 9 ± 0 . 7 ) × 1 0 − 5 , per unit lethargy. Present results together with the reported data based on experimental measurements and reviews are subjected to statistical data reduction using locally-weighted scatterplot-smoothing technique and then interpolated at specific neutron energies. Three linear interpolation schemes were applied where linear-abscissae–linear-ordinates scheme gave the most adequate emulation of the experimental values. Results also adopted the standard emission probability at the high energy end of the emission spectrum as well as the low energy tail.
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