High-spin states and {ital K}-forbidden decay in {sup 172}Hf
- Nuclear Structure Research Laboratory, University of Rochester, 271 East River Road, Rochester, New York 14627 (United States)
High-spin states were populated in {sup 172}Hf with the {sup 48}Ca+{sup 128}Te reaction at 200 and 214 MeV. All of the known rotational bands in {sup 172}Hf have been extended and five new rotational bands have been observed using the Gammasphere spectrometer. This study establishes the highest known state in {sup 172}Hf at spin 44{h_bar}. One of the new bands is a {ital K}{sup {pi}}=(14{sup +}) strongly coupled rotational band. In conflict with the {ital K}-selection rule another newly established bandhead state, with spin {ital I}={ital K}=12, is observed to {gamma} decay directly to the yrast 12{sup +} state. This large breakdown in the {ital K}-selection rule ({Delta}{ital K}{approx}12) may be due to a mixing between the low- and high-{ital K} states in {sup 172}Hf.
- Research Organization:
- Oak Ridge National Laboratory
- DOE Contract Number:
- AC05-84OR21400; FG05-87ER40361
- OSTI ID:
- 122374
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 5 Vol. 52; ISSN PRVCAN; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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