Decay ofCd115m

The decay of ${\mathrm{Cd}}^{115m}$ has been investigated with scintillation and magnetic spectrometers along with the coincidence technique. Gamma rays of 485-, 930-, 1125-, 1285-, and 1430-keV energy have been observed and their intensities have been calculated from the analysis of the gamma spectrum. Weak-intensity gamma rays of energies 160, 310, 650, and 890 keV have been observed in the coincidence spectra. The shape of the beta transition to the ground state deviates from the statistical shape and the correction factor for this is calculated. The beta spectrum in coincidence with 930-keV gamma ray has been shown to have a unique first-forbidden shape. A decay scheme consistent with these results is presented.