Physics Letters B (Sep 2017)
Spectroscopy at the two-proton drip line: Excited states in 158W
- 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. Nyman,
- D. O'Donnell,
- J. Pakarinen,
- P. Rahkila,
- M. Sandzelius,
- J. Sarén,
- C. Scholey,
- D. Seweryniak,
- J. Simpson,
- J. Sorri
Affiliations
- D.T. Joss
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- R.D. Page
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- A. Herzán
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- L. Donosa
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- J. Uusitalo
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- R.J. Carroll
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- I.G. Darby
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- K. Andgren
- Department of Physics, Royal Institute of Technology, Alba Nova Centre, S106 91, Stockholm, Sweden
- B. Cederwall
- Department of Physics, Royal Institute of Technology, Alba Nova Centre, S106 91, Stockholm, Sweden
- S. Eeckhaudt
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- T. Grahn
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- P.T. Greenlees
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- B. Hadinia
- Department of Physics, Royal Institute of Technology, Alba Nova Centre, S106 91, Stockholm, Sweden
- U. Jakobsson
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- P.M. Jones
- Department of Nuclear Physics, iThemba Laboratory for Accelerator Based Sciences, PO Box 722, Somerset West 7129, South Africa
- R. Julin
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- S. Juutinen
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- M. Leino
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- A.-P. Leppanen
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- M. Nyman
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- D. O'Donnell
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- J. Pakarinen
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- P. Rahkila
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- M. Sandzelius
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- J. Sarén
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- C. Scholey
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- D. Seweryniak
- Argonne National Laboratory, Argonne, IL, 60439, USA
- J. Simpson
- STFC, Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom
- J. Sorri
- Department of Physics, University of Jyvaskyla, PO Box 35 FI-40014, Jyvaskyla, Finland
- DOI
- https://doi.org/10.1016/j.physletb.2017.07.031
- Journal volume & issue
-
Vol. 772,
no. C
pp. 703 – 707
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.
Keywords
