Fast decay of a three-quasiparticle isomer in {sup 171}Tm

Journal Article · Wed Apr 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.044321· OSTI ID:21286878

Walker, P M; Wood, R J; El-Masri, H M; Wheldon, C ^[1]; Dracoulis, G D; Kibedi, T; Bark, R A; Davidson, P M; Lane, G J; Moon, C ^[2]; Bruce, A M; Orce, J N; Estevez, F M. Prados ^[3]; Byrne, A P; Wilson, A N ^[2]

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1. Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH (United Kingdom)
2. Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra ACT0200 (Australia)
3. School of Environment and Technology, University of Brighton, Brighton BN2 4GJ (United Kingdom)

Incomplete-fusion reactions have been used to study high-spin states in {sup 171}Tm. Gamma rays and conversion electrons were measured using pulsed-beam conditions for enhanced isomer sensitivity. A K{sup {pi}}=19/2{sup +}, three-quasiparticle isomer was identified, with a half-life of 1.7(2){mu}s. The faster than expected transition rates from the isomer can be understood as being due to a chance near-degeneracy, with mixing between the isomeric state and the I{sup {pi}}=19/2{sup +} member of the one-quasiparticle rotational band to which it decays. The implied mixing matrix element is 12(2) eV.

• OSTI ID: 21286878
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BEAMS
CONVERSION
DECAY
ELECTRONS
GAMMA RADIATION
HALF-LIFE
HIGH SPIN STATES
INCOMPLETE FUSION REACTIONS
ISOMERS
MATRIX ELEMENTS
MIXING
ROTATIONAL STATES
SENSITIVITY
THULIUM 171