Spectroscopy of low-spin states in $^{157}\mathrm{Dy}$: Search for evidence of enhanced octupole correlations
- 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.
- Newman, R.
- Nyakó, B.M.
- Ntshangase, S.S.
- 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.
- Timár, J.
- Uusitalo, J.
- Zimba, G.
Publication date
January 2019
DOI Publisher
American Physical Society (APS)Abstract
International audienceLow-spin states of Dy157 have been studied using the JUROGAM II array, following the Gd155 (α, 2n) reaction at a beam energy of 25 MeV. The level scheme of Dy157 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
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