Pm. Walker et al., K-PI=6- ISOMER DECAYS IN HF-172 AND DELTA-K=8 E1 TRANSITION RATES( AND 8), Physical review. C. Nuclear physics, 49(3), 1994, pp. 1718-1721
A recoil-shadow measurement of isomer decay in 172Hf has revealed many
weak gamma-ray transitions. One of these is a sevenfold K-forbidden E
1 transition from the K(pi) = 8- isomer (T1/2 = 163 ns) to the K(pi) =
0+ ground-state band. The low hindrance factor for this transition in
Hf-172 is compared with the hindrance factors for other DELTAK = 8 E1
transitions.