Abstract
Several nuclear energy levels in 123Sb populated by the β − decay of 125 d 123Sn have been examined. The presence of two states at 1032 and 1089 keV was deduced from studies utilizing a Ge(Li) gamma-ray spectrometer and a third state, at 1187 keV, has been proposed on the basis of gamma-ray coincidence measurements. The β − spectrum to the 1089 keV state was studied by means of a 4 π plastic scintillator operating in coincidence with a NaI(Tl) gamma-ray spectrometer. A Fermi-Kurie plot of the spectrum was found to be linear indicating that the transition is either allowed or non-unique first forbidden. The log ft value of 9.0 found for this transition tends to support the latter assignment.
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