Abstract
High-spin states in 164Yb have been populated in the 152Sm( 16O, 4n) and 150Sm( 18O, 4n) reactions. From studies of γγ coincidences, γ-ray angular distributions and conversion electron measurements the level scheme has been constructed. The g-band and the S-band have been established to spin and parity 22 + and 26 +', respectively, and the rotational sequences ( π, α) = (−, 1) 1, (−, 0) 1 and (−, 0) 2 to 23 −, 24 − and 18 −, respectively. Constructed two-quasineutron configurations and cranked shell model calculations are compared with the experimental results. Residual interactions between quasiparticles are extracted from data. The side-bands in 162, 164Er and 164, 166Yb are discussed, putting a special emphasis on the octupole bands and their interaction with the two-quasiparticle bands. Crossing frequencies and the gain in alignment are summarized for the Yb isotopes and the main features are discussed.
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