Abstract
Gamma rays deexciting states in the proton emitter were observed using the recoil-decay tagging method. The ground-state rotational band was found to exhibit the properties expected for an proton decoupled band. In addition, coincidences between protons feeding the state in and the -ray transition were detected, the first measurement of this kind, leading to a more precise value for the excitation energy of 329(1) keV. Calculations with the particle-rotor model and the core quasiparticle coupling model indicate that the properties of the band and the proton-decay rates in are consistent with the presence of triaxiality with an asymmetry parameter .
- Received 24 July 2006
DOI:https://doi.org/10.1103/PhysRevLett.99.082502
©2007 American Physical Society