α-decay properties ofPb181

The isotope {sup 181}Pb was produced in {sup 92}Mo bombardments of {sup 90}Zr and, together with other reaction products, was passed through a recoil mass separator and implanted in a double-sided silicon strip detector for {alpha}-particle assay. The half-life and energy of the main {sup 181}Pb {alpha} transition were determined to be 45 (20) ms and 7065 (20) keV, respectively. This {sup 181}Pb {ital E}{sub {alpha}} agrees with one previously measured value [7044 (15) keV], but not with the one [7211 (10) keV] used as input to the 1993 Atomic Mass Evaluation. The 6180-keV {alpha} transition assigned to {sup 181}Tl by Bolshakov {ital et} {ital al}. was observed, but the 6566-keV {alpha} par…