Spectroscopy at the two-proton drip line: excited states in W-158

D. T. Joss, R. D. Page, A. Herzán, L. Donosa, J. Uusitalo, R. J. Carroll, I. G. Darby, K. Andgren, B. Cederwall, S. Eeckhaudt, T. Grahn, P.T. Greenlees, B. Hadinia, U. Jakobsson, P.M. Jones, R. Julin, S. Juutinen, M. Leino, A. -P. Leppanen, M. NymanD. O'Donnell, J. Pakarinen, P. Rahkila, M. Sandzelius, J. Sarén, C. Scholey, D. Seweryniak, J Simpson, J. Sorri

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Abstract

Excited states have been identified in the heaviest known even-Z N=84 isotone 158W, which lies in a region of one-proton emitters and the two-proton drip line. The observation of γ-ray transitions feeding the ground state establishes the excitation energy of the yrast 6+ state confirming the spin-gap nature of the α-decaying 8+ isomer. The 8+ isomer is also expected to be unbound to two-proton emission but no evidence for this decay mode was observed. An upper limit for the two-proton decay branch has been deduced as b2p ≤ 0.17% at the 90% confidence level. The possibility of observing two-proton emission from multiparticle isomers in nearby nuclides is considered.
Original languageEnglish
Pages (from-to)703-707
JournalPhysics Letters B
Volume772
Early online date20 Jul 2017
DOIs
Publication statusPublished - 10 Sep 2017
Externally publishedYes

Keywords

  • Multiparticle excited states
  • Proton radioactivity

Cite this

Joss, D. T., Page, R. D., Herzán, A., Donosa, L., Uusitalo, J., Carroll, R. J., Darby, I. G., Andgren, K., Cederwall, B., Eeckhaudt, S., Grahn, T., Greenlees, P. T., Hadinia, B., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Leino, M., Leppanen, A. -P., ... Sorri, J. (2017). Spectroscopy at the two-proton drip line: excited states in W-158. Physics Letters B, 772, 703-707. https://doi.org/10.1016/j.physletb.2017.07.031