Elsevier

Nuclear Physics A

Volume 520, December 1990, Pages c287-c295
Nuclear Physics A

Intruder πh92 and πi132 bands in Re and Ir nuclei

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Abstract

Experimental aligned angular momenta, band-crossing frequencies, and relative transition rates are systematically analyzed for a series of Re and Ir isotopes. Configuration-dependent nuclear shapes associated with the occupation of the πi132, πh92, πh112, and πd52 configurations are especially emphasized in the discussion. It is found that the πi132 orbit has a strong, positive-β2 driving effect on the nuclear shape, while the driving force of the πh92 orbit is minimized when the Fermi level is close to this orbit. The gradual alignment gains observed in bands built on the πh112 and πd52 configurations could be associated with νi132 crossings brought low in rotational frequency by smaller β2 and/or more negative γ values.

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This work is supported by the U.S. Department of Energy under contract No. DE-FG05-87ER40361.

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