K-Hindered Decay of a Six-Quasiparticle Isomer in 176Hf
Physical Review C
The structure and decay properties of high-K isomers in 176Hf have been studied using beam sweeping techniques and the Gammasphere multidetector array. A new ΔK=8 decay branch, from a Kπ=22−, six-quasiparticle, someric (t1/2=43μs) state at 4864 keV to the 20− state of a Kπ=14−band, has been identified. The reduced hindrance factor per degree of K forbiddenness for this decay is measured to be unusually low (fν=3.2), which suggests K mixing in the states involved. The deduced interaction matrix elements are discussed within the context of relevant K-mixing scenarios. The 3266-keV state, previously interpreted as a Kπ=16+ intrinsic state, is reassigned as the Jπ=16+ member of the band based on the Kπ=15+ state at 3080 keV. The systematics of fνvalues as a function of the degree of forbiddenness is discussed in light of this change.
Haring-Kaye, Robert A.; Mukherjee, G.; Chowdhury, P.; Kondev, F.G.; Walker, P.M.; Dracoulis, G.D.; D'Alarcao, R.; Shestakova, I.; Saleem, K. Abu; and Ahmad, I., "K-Hindered Decay of a Six-Quasiparticle Isomer in 176Hf" (2010). Physics & Astronomy Faculty Work. 19.
Link Out URL