Two-quasiparticle excitations and collectivity in the weakly-deformed transitional isotopes 104, 106, 108Cd |
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Authors: | W Andrejtscheff LK Kostov H Rotter H Prade F Stary M Senba N Tsoupas ZZ Ding P Raghavan |
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Institution: | Bulgarian Academy of Sciences, Institute of Nuclear Research and Nuclear Energy, 1184 Sofia, Bulgaria;Akademie der Wissenschaften der DDR, Zentralinstitut für Kernforschung Rossendorf, 8051 Dresden, GDR |
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Abstract: | Using the generalized centroid-shift method on the Rutgers tandem, the following half-lives of 106Cd excited states were measured in the reaction 93Nb(16O, p2n): . With the same method applied on the Rossendorf cyclotron, the following half-lives were measured in the reactions as well as , , , , , and . The results reveal the non-collective (two-quasiparticle) character of several states above 2.9 MeV in 104, 106, 108Cd, in qualitative accordance with predictions of the slightly-deformed-rotor model. They concern completely aligned hg] (9??11?-13?, etc.) as well as semi-decoupled hd] (6?-8?-10?, etc.) two-quasineutron band structures. Further, the possible character of 8+ (two-quasiproton) excitations, 5+ (two-quasineutron) states and of other intrinsic excitations is discussed. The experimental findings present a challenge to current theories of transitional nuclei for a quantitative treatment of absolute γ-ray transition strengths. |
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Keywords: | Nuclear reactions |
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