Decay Schemes of 43-DayCd115mand 2.3-DayCd115g

The decay schemes of 43-day ${}_{}{}^{115m}{}_{}{}^{}\mathrm{Cd}$ and 2.3-day ${}_{}{}^{115g}{}_{}{}^{}\mathrm{Cd}$ were studied using Ge(Li) $\gamma$-ray detectors and coincidence techniques. Gamma rays of the following energies (in keV) and relative intensities (in parentheses) were observed in the decay of ${}_{}{}^{115g}{}_{}{}^{}\mathrm{Cd}$: 35 (1.4), 232 (2.4), 261 (6.5), 267 (0.13), 336 (178, ${}_{}{}^{115m}{}_{}{}^{}\mathrm{In}$ I.T.), 493 (26), and 528 (100). The energies and relative intensities of $\gamma$ rays observed in the decay of ${}_{}{}^{115m}{}_{}{}^{}\mathrm{Cd}$ are: 106 (0.45), 158 (0.9), 336 (0.25, ${}_{}{}^{115m}{}_{}{}^{}\mathrm{In}$ I.T.), 485 (13.6), 493 (0.45), 934 (100), 1133 (4.2), 1291 (46), 1419 (0.11), and 1450 (0.85). Upper limits of 0.03 and 0.10 are placed on the relative intensities of 130- and 292-keV $\gamma$ rays, respectively, that have previously been reported for ${}_{}{}^{115m}{}_{}{}^{}\mathrm{Cd}$ decay. The 106-, 336-, 493-, and 1450-keV $\gamma$ rays have not been previously observed in ${}_{}{}^{115m}{}_{}{}^{}\mathrm{Cd}$ decay, although the 336- (${}_{}{}^{115m}{}_{}{}^{}\mathrm{In}$ I.T.) and 493-keV $\gamma$ rays are well known to occur in the decay of ${}_{}{}^{115g}{}_{}{}^{}\mathrm{Cd}$. Excited states in ${}_{}{}^{115}{}_{}{}^{}\mathrm{In}$ are established at 336 (4.4-h ${}_{}{}^{115m}{}_{}{}^{}\mathrm{In}$), 597, 829, 864, 934, 1078 (from previous electromagnetic excitation studies), 1133, 1291, 1419, and 1450 keV. The first four of these levels are fed directly by $\beta$ decay of ${}_{}{}^{115g}{}_{}{}^{}\mathrm{Cd}$, and the ground state plus levels at 934, 1133, 1291, 1419, and 1450 are fed by that of ${}_{}{}^{115m}{}_{}{}^{}\mathrm{Cd}$. We have found that ${}_{}{}^{115m}{}_{}{}^{}\mathrm{In}$ is formed in about 0.009% of the