Competing decay modes of a high-spin isomer in the proton-unbound nucleus 158Ta

R.J. Carroll, R.D. Page, D.T. Joss, J. Uusitalo, I.G. Darby, K. Andgren, B. Cederwall, S. Eeckhaudt, T. Grahn, C. Gray-Jones, P.T. Greenlees, B. Hadinia, P.M. Jones, R. Julin, S. Juutinen, M. Leino, A.-P. Leppänen, M. Nyman, D. O'Donnell, J. PakarinenP. Rahkila, M. Sandzelius, J. Sarén, C. Scholey, D. Seweryniak, J. Simpson

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2 Citations (Scopus)


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 11ℏ. In this paper, additional evidence supporting the assignment of this α decay to the high-spin isomer in 158Ta will be presented.
Original languageEnglish
Pages (from-to)695-698
Number of pages4
JournalActa Physica Polonica B
Issue number3
Publication statusPublished - 2015
Externally publishedYes


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