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Authors: | About ScienceDirect |
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Institution: | Fysisch Laboratorium, Rijksuniversiteit Utrecht, PO Box 80.000, 3508 TA Utrecht, The Netherlands;Institut de Physique Corpusculaire, UCL, Louvain-la-Neuve, Belgium;Instituut voor Kern- en Stralingsfysica, KUL, Leuven, Belgium;Kernfysisch Versnetler Instituut, Rijksuniversiteit Groningen, The Netherlands |
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Abstract: | High-spin states in 167,168Hf and 170, 171W have been excited by the reactions . The yrast bands have been observed up to in 167Hf, Jπ = 28+ in 168Hf, in 171W and Jπ = 22+ in 170W. Both even-even nuclei display a strong backbend around Jπ = 14+, whereas 167Hf shows an upbend at ω ~- 0.33 MeV and 171W exhibits a progressive gain in aligned angular momentum above ω ~- 0.26 MeV. At even higher rotational frequencies, bridges have been found in the central valleys of the γ-γ correlation matrices at ω ~- 0.42 and 0.52 MeV for the Hf isotopes and ω ~- 0.45 and 0.47 MeV for the W isotopes. Deduced moments of inertia for the Hf isotopes using the correlation data show a smooth increase up to about the rigid-sphere value at ω ~- 0.5 MeV. The data are satisfactorily accounted for by cranked shell-model calculations. In particular, a qualitative interpretation is given for the experimentally observed systematic difference in the strength of the interaction potential for the N = 95 and N = 97 isotopes of Hf and W. |
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Keywords: | Nuclear reactions |
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