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Collective structures and smooth band termination in109Sn |
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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 |
| Affiliation: | 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, 11794, Stony Brook, NY, USA 4. Department of Mathematical Physics, Lund Institute of Technology, Box 118, S-22100, Lund, Sweden 6. Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Tzarigrad Chaussee 72, BG-1784, Sofia, Bulgaria 7. Oliver Lodge Laboratory, University of Liverpool, P.O. Box 147, L69 3BX, Liverpool, UK 8. Department of Physics, University of Toronto, M5S 1A7, Ontario, Canada 9. Hahn-Meitner-Institut Berlin, Bereich Schwerionenphysik, Glienicker Strasse 100, D-14109, Berlin, Germany 10. Department of Physics, University of York, YO1 5DD, Heslington, York, UK 11. Lawrence Berkeley Laboratory, Nuclear Science Division, 94720, Berkeley, CA, USA |
| Abstract: | Six rotational bands up to energies E x =24.7 MeV and spinsj π=(79/2?) have been identified in109Sn using the GAMMASPHEREγ-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 core108Sn. 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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