Band termination spectroscopy in 157Er

Gale, S.J. and Simpson, J. and Riley, M.A. and Sharpey-Schafer, J.F. and Paul, E.S. and Bentley, M.A. and Bruce, A.M. and Chapman, R. and Clark, R.M. and Clarke, S. and Copnell, J. and Cullen, D.M. and Fallon, P. and Fitzpatrick, A. and Forsyth, P.D. and Freeman, S.J. and Jones, P.M. and Joyce, M.J. and Liden, F. and Lisle, J.C. and MacChiavellio, A.O. and Smith, A.G. and Smith, J. and Sweeney, J. and Thompson, D.M. and Warburton, S. and Wilson, J.N. and Ragnarsson, I. (1995) Band termination spectroscopy in 157Er. Journal of Physics G: Nuclear and Particle Physics, 21 (2). pp. 193-213. ISSN 0954-3899

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The level scheme of 157Er has been extended from a spin region where the nucleus behaves as a prolate rotor to a region where the spin is produced by the alignment of all or most of the available valence nucleons along the symmetry axis of a weakly deformed oblate shape. The level scheme was established at high spin using up to four-fold gamma -ray coincidences detected in the Eurogam spectrometer following the reaction 114Cd(48Ca,5n)157Er at a bombarding energy of 210 MeV. Particularly favoured states have been established at IK=69/2+, 81/2+, 71/2+, 77/2-, 87-/2 and 89-/2. Specific single-particle configurations are assigned to these special states by comparison with cranked Nilsson-Strutinsky calculations. These states are related to structures observed in the neighbouring nuclei 158Er and 157Ho. These data provide the spectrum of single-particle states for the lowest lying valence orbitals above the 146Gd closed core.

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Journal Article
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Journal of Physics G: Nuclear and Particle Physics
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01 Apr 2019 12:55
Last Modified:
17 Sep 2023 02:31