Abstract
In-beam γ-ray spectroscopy experiments have been performed on 160, 161, 162Yb in Copenhagen and on 160Yb in Oak Ridge. Fifteen rotational sequences (bands) were observed, most of them beyond I = 20. Thirteen band crossings (upbends or backbends) were found, and these are classified according to the frequency and the gain in aligned angular momentum in the crossing. Six negative-parity side bands in 160,162Yb and the i 13 2 band in 161Yb experience a similar crossing around ω = 0.36 MeV/ h ̵ , a value intermediate to the frequencies of the first and second yrast backbends in 160Yb. Cranking model calculations are used to suggest quasiparticle assignments for the bands and to explain the nature of the three basic types of band crossings observed in our measurements.
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