Blurring the boundaries: decays of multiparticle isomers at the proton drip line

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. Leppanen, M. Nyman, D. O'Donnell, J. PakarinenP. Rahkila, M. Sandzelius, J. Saren, C. Scholey, D. Seweryniak, J. Simpson

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23 Citations (Scopus)

Abstract

A multiparticle spin-trap isomer has been discovered in the proton-unbound nucleus Ta85      73158. The isomer mainly decays by γ-ray emission with a half-life of 6.1(1)  μs. Analysis of the γ-ray data shows that the isomer lies 2668 keV above the known 9+ state and has a spin 10ℏ higher and negative parity. This 19− isomer also has an 8644(11) keV, 1.4(2)% α-decay branch that populates the 9+ state in Lu154. No proton-decay branch from the isomer was identified, despite the isomer being unbound to proton emission by 3261(14) keV. This remarkable stability against proton emission is compared with theoretical predictions, and the implications for the extent of observable nuclides are considered.
Original languageEnglish
Article number092501
JournalPhysical Review Letters
Volume112
Issue number9
DOIs
Publication statusPublished - 7 Mar 2014

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