β decay of 113 Cd was studied with the help of a low background CdWO 4 crystal scintillator (mass of 434 g) in an experiment at the Gran Sasso National Laboratories of the INFN for a period of 2758 h. The shape of the spectrum of the non-unique fourth-forbidden decay of 113 Cd was measured, and the half-life of 113 Cd was determined as T 1/2 = (8.04 ± 0.05) × 10 15 yr.
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