Spectroscopy at the two-proton drip line: Excited states in 158W
Joss, D. T., Page, R. D., Herzan, A., Donosa, L., Uusitalo, J., Carroll, R. J., . . . Sorri, J. (2017). Spectroscopy at the two-proton drip line: Excited states in 158W. Physics Letters B, 772, 703-707. doi:10.1016/j.physletb.2017.07.031
Published inPhysics Letters B
© 2017 the Authors. Published by Elsevier BV. This is an open access article distributed under the Creative Commons Attribution license. Funded by SCOAP3.
Excited states have been identified in the heaviest known even-Z 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 0.17% at the 90% confidence level. The possibility of observing two-proton emission from multiparticle isomers in nearby nuclides is considered.