Browsing by Author "Bianco, L."

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    First candidates for γ vibrational bands built on the [505]11/2– neutron orbital in odd-A Dy isotopes
    (American Physical Society, 2020-05-10) Majola, S. N. T.; Sithole, M. A.; Mdletshe, L.; Hartley, D.; Timar, J.; Nyako, B. M.; Allmond, J. M.; Bark, R. A.; Beausang, C.; Bianco, L.; Bucher, T. D.; Bvumbi, S. P.; Carpenter, M.P.; Chiara, C. J.; Cooper, N.; Cullen, D. M.; Curien, D.; Dinoko, T. S.; Gall, B. J. P.; Garrett, P. E.; Greenlees, P. T.; Hirvonen, J; Jakobsson, U.; Jones, P. M.; Julin, R.; Juutinen, S.; Ketelhut, S.; Kheswa, B. V.; Kondev, F.G.; Korichi, A.; Kulp, W.D.; Lauritsen, T.; Lawrie, E. A.; Makhathini, L.; Masiteng, P. L.; Maqabuka, B.; McCutchan, E.A.; Miller, D.; Miller, S.; Minkova, A.; Msebi, L.; Mthembu, S. H.; Ndayishimye, J.; Nieminen, P.; Ngcobo, P. Z.; Ntshangase, S. S.; Orce, J. N.; Peura, P.; Rahkila, P.; Redon, N.; Riedinger, L. L.; Riley, M. A.; Roux, D. G.; Ruotsalainen, P.; Piot, J.; Saren, J.; Sharpey-Schafer, J. F.; Scholey, C.; Shirinda, O.; Simpson, J.; Sorri, J.; Stefanescu, I.; Stolze, S.; Uusitalo, J.; Wang, X.; Werner, V.; Wood, J.L; Yu, C-H.; Zhu, S.; Zimba, G.
    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-A 155, 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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    Spectroscopy of low-spin states in 157Dy : Search for evidence of enhanced octupole correlations
    (American Physical Society, 2019) Majola, S. N. T.; Bark, R. A.; Bianco, L.; Bucher, T. D.; Bvumbi, S. P.; Cullen, D. M.; Garrett, P. E.; Greenlees, P. T.; Hartley, D.; Hirvonen, J.; Jakobsson, U.; Jones, P. M.; Julin, R.; Juutinen, S.; Ketelhut, S.; Kheswa, B. V.; Korichi, A.; Lawrie, E. A.; Masiteng, P. L.; Maqabuka, B.; Mdletshe, L.; Minkova, A.; Ndayishimye, J.; Nieminen, P.; Nyako, B. M.; Peura, P.; Rahkila, P.; Riedinger, L. L.; Riley, M.; Roux, D.; Ruotsalainen, P.; Saren, J.; Sharpey-Schafer, J. F.; Scholey, C.; Shirinda, O.; Sithole, A.; Sorri, J.; Stolze, S.; Timar, J.; Uusitalo, J.; Zimba, G.
    Low-spin states of ¹⁵⁷Dy have been studied using the JUROGAM II array, following the ¹⁵⁵Gd (α, 2n) reaction at a beam energy of 25 MeV. The level scheme of ¹⁵⁷Dy has been expanded with four new bands. Rotational structures built on the [523]5/2⁻ and [402]3/2⁺ neutron orbitals constitute new additions to the level scheme as do many of the inter- and intraband transitions. This manuscript also reports the observation of cross I⁺ →(I–1) ⁻ and I⁻ →(I–1)⁺ E1 dipole transitions interlinking structures built on the [523]5/2⁻ (band 5) and [402]3/2⁺ (band 7) neutron orbitals. These interlacing band structures are interpreted as the bands of parity doublets with simplex quantum number s=–i related to possible octupole correlations.