AI Article Synopsis
- Gamma rays from the proton emitter 145Tm were studied using the recoil-decay tagging method, revealing characteristics of its ground-state rotational band tied to h{11/2} proton decoupling.
- The first measurements showed coincidences between protons and gamma-ray transitions in 144Er, refining the excitation energy of the 2{+} state to 329(1) keV.
- Calculations suggest that the properties of the pi{11/2} band and proton decay rates in 145Tm align with the presence of triaxiality, indicated by an asymmetry parameter gamma of approximately 20 degrees.
Article Abstract
Gamma rays deexciting states in the proton emitter 145Tm were observed using the recoil-decay tagging method. The 145Tm ground-state rotational band was found to exhibit the properties expected for an h{11/2} proton decoupled band. In addition, coincidences between protons feeding the 2{+} state in 144Er and the 2{+}-->0{+} gamma-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 pi{11/2} band and the proton-decay rates in 145Tm are consistent with the presence of triaxiality with an asymmetry parameter gamma approximately 20 degrees .
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| http://dx.doi.org/10.1103/PhysRevLett.99.082502 | DOI Listing |
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