1. Nuclear shapes of highly deformed bands in Hf171,172 and neighboring Hf isotopes
- Author
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Janssens, R.V.F., Hartley, D.J., Ødegård, S., Chowdhury, P., Carpenter, M.P., Afanasjev, A.V., Yadav, R.B., Ma, W.C., Zhang, Y.C., Khoo, T.L., Djongolov, M.K., Cullen, D.M., Roux, D.G., Moore, E.F., Rigby, S.V., Kondev, F.G., Scholes, D.T., Riedinger, L.L., Zhu, S., Lauritsen, T., Zhang, J.-Y., Begnaud, J., Hagemann, G.B., and Ngijoi-Yogo, E.
- Abstract
A Gammasphere experiment was carried out to search for triaxial strongly deformed (TSD) structures in Hf171,172 and the wobbling mode, a unique signature of nuclei with stable triaxiality. Three strongly deformed bands in Hf172 and one in Hf171 were identified through Ca48(Te128, xn) reactions. Linking transitions were established for the band in Hf171 and, consequently, its excitation energies and spins (up to 111/2) were firmly established. However, none of the Hf172 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 Hf171 and two previously proposed TSD candidates in Hf170 and Hf175 are built on proton (i13/2h9/2) 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 Hf175 has most likely a near-prolate superdeformed shape involving the πi13/2νj15/2 high-j intruder orbitals. It is quite likely that the bands in Hf172 are similar in character to this band.
- Published
- 2007
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