β-delayed proton decays of 81Zr and 85Mo

β-delayed proton decays of Tz=1/2 series nuclei 81Zr and 85Mo have been studied in detail by using p-γ coincidence measurement. The β-delayed proton spectra populating the first excited states of the daughter nuclei have been obtained. Half-life of 81Zr has been measured to be 5.3 s±0.5 s and that of 85Mo 3.2 s±0.2 s. By using statistical model calculations and systematic analyses, spins and parities for the ground states of 81Zr and 85Mo have been tentatively assigned to be 3/2- and 1/2-, respectively. Mass excess of 81Zr is -58.3 MeV±0.2 MeV and that of 85Mo -59.1 MeV±0.4 MeV. Combining the measured half-lives with the calculated partial ones yields the branches of β-delayed proton decay for 81Zr and 85Mo of (1.2±0.2)×10-3 and (1.4±0.2)×10-3, respectively.