Effect of a triaxial nuclear shape on proton tunneling: The decay and structure of Tm145

D. Seweryniak, B. Blank, M.P. Carpenter, C.N. Davids, N. Hammond, R.V.F. Janssens, T.L. Khoo, G. Mukherjee, S. Sinha, T. Davinson, Z. Liu, A.P. Robinson, P.J. Woods, S.J. Freeman, N. Hoteling, J. Shergur, W.B. Walters, C. Scholey, K. Starosta, A. Woehr

Research output: Contribution to journalArticlepeer-review

Abstract

Gamma rays deexciting states in the proton emitter Tm145 were observed using the recoil-decay tagging method. The Tm145 ground-state rotational band was found to exhibit the properties expected for an h11/2 proton decoupled band. In addition, coincidences between protons feeding the 2+ state in Er144 and the 2+→0+ γ-ray transition were detected, the first measurement of this kind, leading to a more precise value for the 2+ excitation energy of 329(1) keV. Calculations with the particle-rotor model and the core quasiparticle coupling model indicate that the properties of the πh11/2 band and the proton-decay rates in Tm145 are consistent with the presence of triaxiality with an asymmetry parameter γ≈20°. © 2007 The American Physical Society.
Original languageEnglish
Article number082502
Number of pages4
JournalPhysical Review Letters
Volume99
Issue number8
DOIs
Publication statusPublished - 25 Aug 2007

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