First candidates for γ vibrational bands built on the 11/2− neutron orbital in odd-A Dy isotopes
Majola, S. N. T.; Sithole, M. A.; Mdletshe, L.; Hartley, D.; Timár, J.; Nyakó, B. M.; Allmond, J. M.; Bark, R. A.; Beausang, C.; Bianco, L.; Bucher, T. D.; Bvumbi, S. P.; Carpenter, M. P. et al. (2020). First candidates for γ vibrational bands built on the 11/2− neutron orbital in odd-A Dy isotopes. Physical Review C, 101 (4), 044312. DOI: 10.1103/PhysRevC.101.044312
Published inPhysical Review C
Piot, J. |
Wang, X. |
Zhu, S. |
©2020 American Physical Society
Rotational structures have been measured using the Jurogam II and GAMMASPHERE arrays at low spin following the 155Gd(α,2n)157Dy and 148Nd(12C,5n)155Dy reactions at 25 and 65 MeV, respectively. We report high-K bands, which are conjectured to be the first candidates of a Kπ=2+γ vibrational band, built on the 11/2− neutron orbital, in both odd-A155,157Dy isotopes. The coupling of the first excited K=0+ states or the so-called β vibrational bands at 661 and 676 keV in 154Dy and 156Dy to the 11/2− orbital, to produce a Kπ=11/2− band, was not observed in both 155Dy and 157Dy, respectively. The implication of these findings on the interpretation of the first excited 0+ states in the core nuclei 154Dy and 156Dy are also discussed.