In-beam γ-ray spectroscopy of the proton emitter Tm using recoil-decay tagging

D. Seweryniak, C.N. Davids, W.B. Walters, P.J. Woods, I. Ahmad, H. Amro, D.J. Blumenthal, L.T. Brown, M.P. Carpenter, T. Davinson, S.M. Fischer, D.J. Henderson, R.V.F. Janssens, T.L. Khoo, I. Hibbert, R.J. Irvine, C.J. Lister, J.A. Mackenzie, D. Nisius, C. ParryR. Wadsworth

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Gamma rays from the decay of states in the proton unstable nucleus Tm were observed for the first time following the Mo(Ni,p2n) Tm reaction at 260 MeV. Prompt γ rays were detected with an array of Compton-suppressed Ge detectors, placed in front of the fragment mass analyzer at the ATLAS accelerator, and were assigned to individual reaction channels on an event-by-event basis using the recoil-decay tagging method. Gamma-ray transitions were associated with both the proton decay of the πh ground state and the πd isomeric state in Tm, even though the cross sections for populating these states were only ≈ 16 μb and 2 μb, respectively. The level scheme which was constructed for Tm is discussed and compared with the level structures for lighter N=78 isotones.
Original languageEnglish
JournalPhysical Review C
Issue number5
Publication statusPublished - 1 May 1997


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