Spin-parity assignments and extension of the 02+ band in 158Er
1 Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville, ZA - 7535 South Africa
2 iThemba LABS, National Research Foundation, P.O. Box 722, Somerset West, South Africa
3 University of Johannesburg, Department of Physics, P.O. Box 524, Auckland Park 2006, South Africa
4 Department of Physics, University of Stellenbosch, Private Bag X1, 7602 Matieland, South Africa
5 Department of Physics, University of Cape Town, Private Bag, 7701 Rondebosch, South Africa
a e-mail: firstname.lastname@example.org
Published online: 19 December 2013
Low and medium spin collective structures in 158Er have been studied using the 150Sm(12C,4nγγ) fusion-evaporation reaction at a beam energy of Elab = 65 MeV. A band built on the 02+ excitation has been established and extended to Jπ = 18+ from the analysis of γ-γ coincidence relationships, intensity arguments and DCO ratios. The 02+ band in 158Er presents a similar trend to the 02+ bands in the lighter N = 90 isotones but lies about 125 keV higher. This systematic trend supports a similar configuration for the 02+ bands in the N = 90 isotones.
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