Lifetimes of three excited Kπ=0+ bands have been measured in the same deformed nucleus (178Hf). Evidence is presented for the first observation of two excited Kπ=0+ bands connected via collective E2 transitions. Five-band mixing calculations show that these collective transitions are not the result of mixing between the various bands. It is therefore suggested that the Kπ=05+ band at 1772.2 keV is a collective excitation built on the single phonon Kπ=02+ band at 1199.4 keV.
Aprahamian, A., de Haan, R. C., Börner, H. G., Lehmann, H., Doll, C., Jentschel, M., Bruce, A., & Piepenbring, R. (2002). Lifetime measurements of excited Kπ=0+ bands in 178Hf. Physical Review C, 65(3). https://doi.org/10.1103/PhysRevC.65.031301