Abstract
The lifetime of an excited state above a weakly populated isomer in the proton-unbound odd–odd nucleus 144Ho has been measured using the recoil distance Doppler shift method. This measurement represents the first differential-plunger lifetime measurement to utilize recoil-isomer tagging. The first excited I π = ( 10 + ) state above the two-quasiparticle π h 11 / 2 ⊗ ν h 11 / 2 ( 8 + ) isomer was determined to have a lifetime of τ = 6 ( 1 ) ps . Potential energy surface calculations, based on the configuration-constrained blocking method, predict the isomeric state to have γ-soft triaxial-nuclear shape with | γ | ≈ 24 ° . The lifetime of the ( 10 + ) state can be understood from these calculations if there is a degree of rotational alignment in this band, with the K value being lower than the bandhead spin. However, the validity of the K quantum number with large predicted triaxiality and gamma softness requires further theoretical study.
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