Spectroscopy of low spin states in 157Dy: Search for evidence of enhanced octupole correlations

S. N. T. Majola; R. A. Bark; L. Bianco; T. D. Bucher; S. P. Bvumbi; D. M. Cullen; P. E. Garrett; P. T. Greenlees; D. Hartley; J Hirvonen; U. Jakobsson; P. M. Jones; R. Julin; S. Juutinen; S. Ketelhut; B. V. Kheswa; A. Korichi; E. A. Lawrie; P. L. Masiteng; B. Maqabuka; L. Mdletshe; A. Minkova; J. Ndayishimye; P. Nieminen; R. Newman; B. M. Nyako; S. S. Ntshangase; P. Peura; P. Rahkila; L. L. Riedinger; M. Riley; D. Roux; P. Ruotsalainen; J. Saren; J. F. Sharpey-Schafer; C. Scholey; O. Shirinda; A. Sithole; J. Sorri; S. Stolze; J. Timar; J. Uusitalo; G. Zimba

doi:10.1103/physrevc.100.034322

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arXiv · 2005.04655

Spectroscopy of low spin states in 157Dy: Search for evidence of enhanced octupole correlations

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Abstract

Low-spin states of 157Dy have been studied using the JUROGAM II array, following the 155Gd ({\alpha}, 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 intra-band transitions. This manuscript also reports the observation of cross I- to (I-1)- and I- to (I-1)+ E1 dipole transitions inter-linking 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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S. N. T. Majola, R. A. Bark, L. Bianco, T. D. Bucher, S. P. Bvumbi, D. M. Cullen, P. E. Garrett, P. T. Greenlees, D. Hartley, J Hirvonen, U. Jakobsson, P. M. Jones, R. Julin, S. Juutinen, S. Ketelhut, B. V. Kheswa, A. Korichi, E. A. Lawrie, P. L. Masiteng, B. Maqabuka, L. Mdletshe, A. Minkova, J. Ndayishimye, P. Nieminen, R. Newman, B. M. Nyako, S. S. Ntshangase, P. Peura, P. Rahkila, L. L. Riedinger, M. Riley, D. Roux, P. Ruotsalainen, J. Saren, J. F. Sharpey-Schafer, C. Scholey, O. Shirinda, A. Sithole, J. Sorri, S. Stolze, J. Timar, J. Uusitalo, G. Zimba. 2020-05-10. Spectroscopy of low spin states in 157Dy: Search for evidence of enhanced octupole correlations. https://doi.org/10.1103/physrevc.100.034322

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