COINCIDENCE STUDIES OF THE DECAY OF INDIUM 114

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Abstract
A coincidence circuit of resolving time 3 × 10−9 sec. has been used to examine the decay of In114. Coincidence experiments are described to show that of the five gamma-rays which follow the K-capture process the 0.722 and 1.300 Mev. radiations are both in cascade with the 0.556 Mev. gamma-ray and that the spins and parities of the excited levels of energy 0.556, 1.278, and 1.856 Mev. in Cd114 are 2 +, 2 +, and 0 +, respectively. The observed beta–gamma coincidences may be ascribed to a combination of inner bremsstrahlung associated with the strong 2 Mev. β− transition and a weak β− group of intensity less than 1 × 10−3 beta per disintegration and end point about 0.8 Mev. The positron spectrum has a branching ratio of 4 ± 1 × 10−5 and an end point between 1.0 and 1.4 Mev.

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