Decay ofCd117

Abstract

The ${\mathrm{Cd}}^{117}$ activity produced by ($n, \gamma$) reaction on ${\mathrm{Cd}}^{116}$ was found to decay with a half-life of ∼3 h indicating that the possible isomer also has a half-life almost equal to that of the ground state. The presence of such an isomer was established by beta-gamma coincidence measurements. The highest energy beta group as studied in the intermediate image beta-ray spectrometer showed an end point of 2250 keV. The singles gamma spectrum was complex in nature and extended up to 2450 keV. Beta-gamma and gamma-gamma coincidence studies revealed 29 gamma transitions and eight beta groups belonging to the decay of both the activities of ${\mathrm{Cd}}^{117}$. Based on these and the results of sum coincidence and total absorption studies a decay scheme with levels in ${\mathrm{In}}^{117}$ at 310, 590, 660, 750, 880, 1070, 1410, 1700, 1890, 1980, 2120, 2320, and 2450 keV has been proposed. Possible spins and parities for these levels have been discussed.