Systematic study of the yrast band in the doubly-odd 158,160,162,164,166Tm nuclei☆

Abstract High-spin rotational states of 158,160,162,164 Tm were investigated by in-beam γ-spectroscopy using the ( 14 N, 4n) and ( 14 N, 6n) reactions. The strongly-aligned band π[ h 11 2 ]ν[ i 13 2 ] has been observed in all these nuclei. Our experimental results, together with the data obtained by another group on 166 Tm, are interpreted in the frame of a cranking-model analysis. The behaviour of the moment of inertia versus rotational frequency and the existence of a triaxial shape is discussed.