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Collective structures and smooth band termination in 109Sn |
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| Authors: | L Käubler H Schnare D B Fossan A V Afanasjev W Andrejtscheff R G Allat J de Graaf H Grawe I M Hibbert I Y Lee A D Macchiavelli N O’Brien K H Maier E S Paul H Prade I Ragnarsson J Reif R Schubart R Schwengner I Thorslund P Vaska R Wadsworth G Winter |
| Institution: | 1. Institut für Kern- und Teilchenphysik, TU Dresden, Mommsenstrasse 13, D-01062, Dresden, Germany 2. Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, Postfach 510119, D-01314, Dresden, Germany 3. Department of Physics, State University of New York at Stony Brook, Stony Brook, NY, 11794, USA 4. Department of Mathematical Physics, Lund Institute of Technology, Box 118, S-22100, Lund, Sweden 5. Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Tzarigrad Chaussee 72, BG-1784, Sofia, Bulgaria 6. Oliver Lodge Laboratory, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, UK 7. Department of Physics, University of Toronto, Ontario, M5S 1A7, Canada 8. Hahn-Meitner-Institut Berlin, Bereich Schwerionenphysik, Glienicker Strasse 100, D-14109, Berlin, Germany 9. Department of Physics, University of York, Heslington, York, YO1 5DD, UK 10. Nuclear Science Division, Lawrence Berkeley Laboratory, Berkeley, CA, 94720, USA |
| Abstract: | Six rotational bands up to energies E x = 24.7 MeV and spins Jπ=(79/2?) have been identified in 109Sn using the GAMMASPHERE γ-detector array. Four of the bands show smoothly decreasing dynamic moments of inertia at rotational frequencies ?ω > 0.6 MeV. The bands arise at medium spins from a coupling of a valence d5/2, g7/2 or h11/2 neutron to the deformed 2p2h proton excitation of the Z=50 core 108Sn. At very high ?ω these bands show the typical behaviour of smoothly terminating bands, i.e. a gradual alignment of the angular momenta of the valence particles and holes corresponding to a transition from high collectivity to noncollective states. |
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