The decay pattern of the Pygmy Dipole Resonance of 140 Ce

Löher, B.  (ExtreMe Matter Institute EMMI, Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, Darmstadt, 64291, Germany) (Frankfurt Institute for Advanced Studies FIAS, Ruth-Moufang-Str. 1, Frankfurt am Main, 60438, Germany) (Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, Darmstadt, 64289, Germany) ; Savran, D. (ExtreMe Matter Institute EMMI, Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, Darmstadt, 64291, Germany) (Frankfurt Institute for Advanced Studies FIAS, Ruth-Moufang-Str. 1, Frankfurt am Main, 60438, Germany) ; Aumann, T. (Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, Darmstadt, 64289, Germany) (GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, Darmstadt, 64291, Germany) ; Beller, J. (Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, Darmstadt, 64289, Germany) ; Bhike, M. (Department of Physics, Duke University, Triangle Universities Nuclear Laboratory, Durham, NC, 27708-0308, USA) ; Cooper, N. (WNSL, Yale University, P.O. Box 208120, New Haven, CT, 06520-8120, USA) ; Derya, V. (Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, Köln, D-50937, Germany) ; Duchêne, M. (Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, Darmstadt, 64289, Germany) ; Endres, J. (Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, Köln, D-50937, Germany) ; Hennig, A. (Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, Köln, D-50937, Germany) ; Humby, P. (WNSL, Yale University, P.O. Box 208120, New Haven, CT, 06520-8120, USA) ; Isaak, J. (ExtreMe Matter Institute EMMI, Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, Darmstadt, 64291, Germany) (Frankfurt Institute for Advanced Studies FIAS, Ruth-Moufang-Str. 1, Frankfurt am Main, 60438, Germany) ; Kelley, J.H. (Department of Physics, North Carolina State University, Raleigh, NC, 27607, USA) ; Knörzer, M. (Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, Darmstadt, 64289, Germany) ; Pietralla, N. (Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, Darmstadt, 64289, Germany) ; Ponomarev, V.Yu. (Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, Darmstadt, 64289, Germany) ; Romig, C. (Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, Darmstadt, 64289, Germany) ; Scheck, M. (University of the West of Scotland, Paisley, PA1 2BE, UK) (SUPA, Scottish Universities Physics Alliance, Glasgow, G12 8QQ, UK) ; Scheit, H. (Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, Darmstadt, 64289, Germany) ; Silva, J. (ExtreMe Matter Institute EMMI, Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, Darmstadt, 64291, Germany) (Frankfurt Institute for Advanced Studies FIAS, Ruth-Moufang-Str. 1, Frankfurt am Main, 60438, Germany) ; Tonchev, A.P. (Physics Division, Lawrence Livermore National Laboratory, Livermore, CA, 94551, USA) ; Tornow, W. (Department of Physics, Duke University, Triangle Universities Nuclear Laboratory, Durham, NC, 27708-0308, USA) ; Wamers, F. (ExtreMe Matter Institute EMMI, Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, Darmstadt, 64291, Germany) (Frankfurt Institute for Advanced Studies FIAS, Ruth-Moufang-Str. 1, Frankfurt am Main, 60438, Germany) (GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, Darmstadt, 64291, Germany) ; Weller, H. (Department of Physics, Duke University, Triangle Universities Nuclear Laboratory, Durham, NC, 27708-0308, USA) ; Werner, V. (Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, Darmstadt, 64289, Germany) (WNSL, Yale University, P.O. Box 208120, New Haven, CT, 06520-8120, USA) ; Zilges, A. (Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, Köln, D-50937, Germany)

23 February 2016

Abstract: The decay properties of the Pygmy Dipole Resonance (PDR) have been investigated in the semi-magic N=82 nucleus 140 Ce using a novel combination of nuclear resonance fluorescence and γ – γ coincidence techniques. Branching ratios for transitions to low-lying excited states are determined in a direct and model-independent way both for individual excited states and for excitation energy intervals. Comparison of the experimental results to microscopic calculations in the quasi-particle phonon model exhibits an excellent agreement, supporting the observation that the Pygmy Dipole Resonance couples to the ground state as well as to low-lying excited states. A 10% mixing of the PDR and the [21+×PDR] is extracted.


Published in: Physics letters B (2016)
Published by: Elsevier
DOI: 10.1016/j.physletb.2016.02.042
License: CC-BY-3.0



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