Abstract
Lifetimes of excited states in164Hf were measured using the Doppler-shift recoil-distance method. Gamma-gamma coincidences at eleven target-stopper distances were measured using the twelve Compton-suppressed Ge-detectors of the OSIRIS spectrometer. From the coincidence spectra the intensities of the Doppler-shifted and unshiftedγ-lines were determined. The quadrupole momentsQ tof transitions within the rotational bands derived from the lifetimes are constant within the experimental uncertainties up to the 18+ state. TheQ tvalue for the transition between the ground- and the neutroni 2/213 band (s-band) which is strongly reduced compared to the values of the in-band transitions is used to deduce a band interaction energy of 34 keV ≦V≦57 keV.
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The authors thank R. Wyss who supplied to us the results of TRS calculations for164Hf. One of us (SCP) would like to thank the Rektor, Universität Bonn, for appointing him as a Gastprofessor. This work was supported by the Bundesminister für Forschung und Technologie of the Federal Republic of Germany and by the Minister für Wissenschaft und Forschung des Landes Nordrhein-Westfalen.