“…To obtain the β-delayed neutron emission probability of 81 Zn we compared the number of decays arising from the direct 81 Zn β-decay chain, using the absolute intensities of the two strongest lines in 81 Ge, at 216 and 828 keV [37], to the 81 Zn β − n decay branch of the A = 80 chain, taking the absolute intensities per 100 parent decays of 666-, 1207-, and 1645-keV lines from the β decay of 80 As to 80 Se [41,42]. We employ the literature value of 11.9(7)% for the 81 Ga β − n branch [37] and apply a small correction factor coming from the 80 Ga β − n decay probability of 0.86(7)%, also taken from the literature [43].…”