arXiv:2005.04655·v1·Nuclear Experiment
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🇿🇦
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.
Comments: Published in Physical Review C (2019)