Abstract
Intensities of ? rays produced by absorption of slow neutrons have been measured for eleven elements. The results for thermal neutrons are used to calculate relative values of p, the probability of production of a ?-ray quantum by an absorbed neutron. In general, the values of p so found lie close to unity (which is the value assumed for cadmium). This observation is discussed in relation to the absolute magnitude of p, and it appears likely, in fact, that p is of the order of at least five in the elements investigated. Measurements have also been made of the ?-ray intensities as a function of the thickness of specimen for the elements silver, chlorine and mercury. These lead to approximate determinations of the absorption coefficients of thermal neutrons in these elements. For slow neutrons of greater than thermal energies, the ?-ray intensities have been used to obtain the relative cross sections for ?-ray production.
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