First candidates for γ vibrational bands built on the [505]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 [505]11/2− neutron orbital in odd-A Dy isotopes. Physical Review C, 101 (4), 044312. DOI: 10.1103/PhysRevC.101.044312
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2020Copyright
©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 [505]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 [505]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.
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This work is supported by the South African National Research Foundation under Grants No. 96829, No. 109711, and No. 106012). Support for L.B. and P.E.G. was provided by the Natural Sciences and Engineering Research Council of Canada. V.W. wishes to acknowledge support provided by the German Federal Ministry for education and Research under Grant No. 05P19RDFN1. Support was also provided by the U.S. National Science Foundation under Grants No. PHY-1203100 (USNA), No. PHY-1502092 (USNA), and No. PHY–0754674 (FSU) as well as by the U.S. Department of energy, Office of Nuclear of Nuclear Physics, under Contracts No. DE-AC02-06CH11357 (ANL) and No. DE-FG02-91ER40609 (Yale). The authors also acknowledge the support of GAMMAPOOL for the loan of the JUROGAM detectors. JYFL research is supported by the Academy of Finland under the Finnish Centre of Excellence Programme 2006–2011, Contract No. 213503. This work was also partially supported by the National Research, Development and Innovation Fund of Hungary, financed under the K18 funding scheme with Project No. K128947, as well as by the European Regional Development Fund (Contract No. GINOP–2.3.3–15–2016– 00034).
