Characterization of quasiparticle states at and beyond stability in ytterbium isotopes: Spectroscopy of 175Yb, 176Yb and 177Yb |
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| Authors: | N. J. Ncapayi S. M. Mullins M. Benatar E. Gueorgueiva J. J. Lawrie G. K. Mabala S. Mukherjee S. H. T. Murray K. P. Mutshena R. T. Newman J. F. Sharpey-Schafer F. D. Smit P. Vymers |
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| Affiliation: | (1) iThemba Laboratory for Accelerator Based Sciences, P.O. Box 722, 7129 Somerset West, South Africa;(2) Department of Physics, University of Stellenbosch, Private Bag X1, 7602 Matieland, South Africa;(3) Department of Physics, University of Cape Town, Private Bag, 7701 Rondebosch, South Africa;(4) Department of Physics, University of the Western Cape, Private Bag X17, 7535 Bellville, South Africa |
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| Abstract: | Excited states in 175Yb, 176Yb and 177Yb were populated via the bombardment of a 176Yb target with a 750 MeV 136Xe beam. Gamma-ray decays from these states were measured with the AFRODITE multi-detector spectrometer. The rotational band previously assigned to the ground state of 177Yb has been reassigned to the first-excited state of 175Yb. A new rotational band based on the ground state of 177Yb is presented, and the band based on the Kπ = 4- two-quasiparticle state in 176Yb has been identified. Also a candidate for the rotational band based on the Kπ = 8-, T1/2 = 11.4(3) s two-quasiparticle state in 176Yb has been found. Comparisons of gK values derived from in-band branching ratios are consistent with the ν9/2+[624] assignment to the ground state of 177Yb, the ν2{9/2+[624] ⊗ 1/2-[510]} assignment to the Kπ = 4- state and with the ν2{9/2+[624] ⊗ 7/2-[514]} assignment to the Kπ = 8- metastable excited state in 176Yb. |
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| Keywords: | 29.30.Kv X- and γ -ray spectroscopy 23.20.Lv γ transitions and level energies 21.10.-k Properties of nuclei nuclear energy levels 27.70.+q 150≤ A≤ 189 |
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