Abstract

Rotational properties of the 166Hf nucleus have been studied by in-beam spectroscopic methods using the 150Sm( 20Ne, 4n) 166Hf reaction. The ground band was observed up to the I π = 18 + level, the s-band from the I π = 12 + up to I π = 22 + level; in addition two side bands were found. The results are interpreted in terms of the pairing-self-consistent Hartree-Fock-Bogolyubov cranking model. Quantitative agreement between theory and experiment is obtained for the crossing of the ground band and s-band. The calculations predict a reduction of about 50 % in the neutron pairing energy gap of yrast states in the crossing region. The kinematical ( I (1)) and dynamical ( I (2)) moments of inertia are analysed.

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