Half-life determination of the ground state decay of 111Ag

• Radioactive decay of 111Ag measured by HPGe γ-ray spectrometry.
• Measured half-life of 7.423 (13) days.
• Evaluated recommended half-life of 7.452 (12) days.

The radioactive decay half-life of the β−β−-emitter 111Ag has been measured using decay transitions identified using a high purity germanium γ-ray spectrometer. The time series of measurements of the net peak areas of the 96.8 keV, 245.4 keV and 342.1 keV γ-ray emissions following the β−β− decay of 111Ag were made over approximately 23 days, i.e. ~3 half-life periods. The measured half-life of the ground state decay of 111Ag was determined as 7.423 (13) days which is consistent with the Evaluated Nuclear Structure Data File (ENSDF) recommended half-life of 7.45 (1) days at k=2. Utilising all available experimental half-life values, a revised recommended half-life of 7.452 (12) days has been determined.