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Abstract
THE selectivities (in Z) observed in the activation of nuclei by capture of slow neutrons are explained by differences of the energy (E) of the lowest neutron resonance level in different nuclei: the contribution of one level to the capture cross-section for thermal neutrons is proportional to 1/E2, while the cross-section at resonance is proportional to 1√E ; the measured values of E lie between 1 and 200 volts. The application of the one-level formula1,2 to the experimental results yields some evidence on the neutron width n and the radiation width r of the best-known resonance levels. Some experimental evidence on the total widths has also been obtained3,4,5.
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