Abstract
Excited states of 166Tm were investigated by means of the 165Ho(α, 3n) reaction. Two rotational bands were identified up to tentative spins of 20 − and 18 +. Their electromagnetic.properties were studied and interpreted in the framework of the cranking shell model (CSM) and of the particle-rotor model (PRM). Both the revised Dönau and Frauendorf formula (CSM) and the PRM calculations reproduce the experimental results rather well for spins between 10 and 14, whereas they fail at low and high angular momenta. The two models predict different I-dependences for the B(M1) values in the angular momentum region of I < j p + j n . The existence and interpretation of the signature inversion of the yrast band is discussed using three different models. The results show that the occurrence of signature inversion does not necessarily mean the presence of trixial nuclear shape.
Published Version
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