Effect of a triaxial nuclear shape on proton tunneling : the decay and structure of {sup 145}Tm.
Gamma rays deexciting states in the proton emitter {sup 145}Tm were observed using the recoil-decay tagging method. The {sup 145}Tm ground-state rotational band was found to exhibit the properties expected for an h{sub 11/2} proton decoupled band. In addition, coincidences between protons feeding the 2{sup +} state in {sup 144}Er and the 2{sup +} {yields} 0{sup +} {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}h{sub 11/2} band and the proton-decay rates in {sup 145}Tm are consistent with the presence of triaxiality with an asymmetry parameter {gamma} {approx} 20 degrees.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 917982
- Report Number(s):
- ANL/PHY/JA-57124; PRLTAO; TRN: US0805195
- Journal Information:
- Phys. Rev. Lett., Vol. 99, Issue Aug. 24, 2007; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- ENGLISH
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