Abstract
The 166Er( 3He, 3nγ) and 164Er(α, 2nγ) reactions were used to populate rotational side-bands in the N = 96 nucleus 166Yb. The aligned v( i 13 2 ) 2 S-band was observed from I π = 8 +to 12 +, while the β- and γ-vibrational bands were observed from the bandheads to I π = 10 +and 12 +, respectively. Negative-parity bands with K π = 0 −, (2 −) and 5 − were also observed. Band crossings and interaction effects are seen in both the positive- and negative-parity excitations below about h ̵ ω = 0.25 MeV , the frequency at which the first yrast backbend occurs.
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