The Nuclear Excitation of Silver and Cadmium

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Abstract
The x-ray and electron excitation of silver and cadmium has been studied in the region from their thresholds to 3.3 Mev. The thick target x-ray excitation curve for silver shows the threshold to be 1.18±0.03 Mev and higher activation levels are found at 1.59, 1.95, 2.32, 2.76, and 3.13 Mev, respectively. The half-life of the metastable state of silver is 40.4±0.2 seconds. Both the thick target x-ray excitation curve and the electron excitation curve for cadmium indicate that the threshold for these processes is 1.25±0.03 Mev while other activation levels are found at 1.68, 2.08, and 2.56 Mev. The energy of the metastable level of cadmium, as determined from data on the absorption in aluminum of the conversion electrons emitted in the process, has been found to be 195 kev and the half-life of the metastable level is 48.7±0.3 minutes.