Competing Decay Modes of a High-spin Isomer in the Proton-unbound Nucleus 158Ta
Carroll, R. J., Page, R. D., Joss, D. T., Uusitalo, J., Darby, I. G., Andgren, K., . . . Simpson, J. (2015). Competing Decay Modes of a High-spin Isomer in the Proton-unbound Nucleus 158Ta. Acta Physica Polonica B, 46 (3), 695-698. doi:10.5506/APhysPolB.46.695
Published inActa Physica Polonica B
© the Authors, 2015. This is an open access article licensed under the terms of a Creative Commons Attribution 3.0 License. Funded by SCOAP3.
An isomeric state at high spin and excitation energy was recently observed in the proton-unbound nucleus 158Ta. This state was observed to decay by both α and γ decay modes. The large spin change required to decay via γ-ray emission incurs a lifetime long enough for α decay to compete. The α decay has an energy of 8644(11) keV, which is among the highest observed in the region, a partial half-life of 440(70) µs and changes the spin by 11~. In this paper, additional evidence supporting the assignment of this α decay to the high-spin isomer in 158Ta will be presented.