Elsevier

Physics Letters B

Volume 608, Issues 1–2, 17 February 2005, Pages 31-38
Physics Letters B

Wobbling excitations in strongly deformed Hf nuclei?

https://doi.org/10.1016/j.physletb.2005.01.007Get rights and content

Abstract

Two Gammasphere experiments have been performed in order to establish the possible triaxial nature of strongly deformed (SD) bands in 174Hf. A lifetime measurement, using the Doppler-shift attenuation method, confirmed the large deformation of the four previously observed bands in this nucleus with transition quadrupole moments ranging from 12.6 to 13.8 b. These values are significantly larger than those predicted for triaxial minima by ultimate cranker (UC) calculations. A thin-target, high-statistics experiment was also carried out to search for linking transitions between the SD bands. No such transitions, which represent an experimental signature for wobbling modes, were observed. Four additional SD bands were found in 174Hf together with a single SD band in 173Hf. These results indicate that the strongly deformed sequences of N102 Hf isotopes behave differently than the triaxial strongly deformed (TSD) bands found in Lu nuclei near N=92. The interpretation of these bands in terms of possible stable triaxial deformation is confronted with the experimental findings and UC predictions.

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Acknowledgments

The authors wish to thank the staffs at the 88-Inch and ATLAS accelerator facilities for their support during the experiments. In particular, we thank John Greene for target preparation. Software support by D.C. Radford and H. Jin is gratefully acknowledged. This work was supported by the National Science Foundation under grant Nos. PHY-0300673 (USNA) and PHY-0139950 (FSU), as well as the Department of Energy, office of Nuclear Physics, under contract Nos. DE-FG02-96ER40983 (UT),

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