Abstract
The beta -delayed gamma spectroscopy of ^{81}As has been performed using a purified beam of ^{81}Ge (9/2^+) ground state at the Ion Guide Isotope Separator On-Line facility (IGISOL). The ^{81}Ge^+ ions were produced using proton-induced fission of ^{232}Th and selected with the double Penning trap JYFLTRAP for the post-trap decay spectroscopy measurements. The low-spin (1/2^+) isomeric-state ions ^{81m}hbox {Ge}^+ were not observed in the fission products. The intrinsic half-life of the ^{81}Ge ground state has been determined as T_{1/2}=6.4(2)~hbox {s}, which is significantly shorter than the literature value. A new level scheme of ^{81}As has been built and is compared to shell-model calculations.
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