Nuclear shapes of highly deformed bands in {sup 171,172}Hf and neighboring Hf isotopes
- Department of Physics, Mississippi State University, Mississippi State, Mississippi 39762 (United States)
- Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen (Denmark)
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Department of Physics, University of Massachusetts, Lowell, Massachusetts 01854 (United States)
- Schuster Laboratory, University of Manchester, Manchester M13 9PL (United Kingdom)
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States)
A Gammasphere experiment was carried out to search for triaxial strongly deformed (TSD) structures in {sup 171,172}Hf and the wobbling mode, a unique signature of nuclei with stable triaxiality. Three strongly deformed bands in {sup 172}Hf and one in {sup 171}Hf were identified through {sup 48}Ca({sup 128}Te, xn) reactions. Linking transitions were established for the band in {sup 171}Hf and, consequently, its excitation energies and spins (up to 111/2({Dirac_h}/2{pi})) were firmly established. However, none of the {sup 172}Hf sequences were linked to known structures. Experimental evidence of triaxiality was not observed in these bands. The new bands are compared with other known strongly deformed bands in neighboring Hf isotopes. Theoretical investigations within various models have been performed. Cranking calculations with the Ultimate Cranker code suggest that the band in {sup 171}Hf and two previously proposed TSD candidates in {sup 170}Hf and {sup 175}Hf are built on proton (i{sub 13/2}h{sub 9/2}) configurations, associated with near-prolate shapes and deformations enhanced with respect to the normal deformed bands. Cranked relativistic mean-field calculations suggest that band 2 in {sup 175}Hf has most likely a near-prolate superdeformed shape involving the {pi}i{sub 13/2} x {nu}j{sub 15/2} high-j intruder orbitals. It is quite likely that the bands in {sup 172}Hf are similar in character to this band.
- OSTI ID:
- 21067978
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 76, Issue 6; Other Information: DOI: 10.1103/PhysRevC.76.064321; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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