Physics Letters B (May 2016)
The decay pattern of the Pygmy Dipole Resonance of 140Ce
- B. Löher,
- D. Savran,
- T. Aumann,
- J. Beller,
- M. Bhike,
- N. Cooper,
- V. Derya,
- M. Duchêne,
- J. Endres,
- A. Hennig,
- P. Humby,
- J. Isaak,
- J.H. Kelley,
- M. Knörzer,
- N. Pietralla,
- V.Yu. Ponomarev,
- C. Romig,
- M. Scheck,
- H. Scheit,
- J. Silva,
- A.P. Tonchev,
- W. Tornow,
- F. Wamers,
- H. Weller,
- V. Werner,
- A. Zilges
Affiliations
- B. Löher
- ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany
- D. Savran
- ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany
- T. Aumann
- Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
- J. Beller
- Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
- M. Bhike
- Department of Physics, Duke University and Triangle Universities Nuclear Laboratory, Durham, NC 27708-0308, USA
- N. Cooper
- WNSL, Yale University, P.O. Box 208120, New Haven, CT 06520-8120, USA
- V. Derya
- Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
- M. Duchêne
- Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
- J. Endres
- Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
- A. Hennig
- Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
- P. Humby
- WNSL, Yale University, P.O. Box 208120, New Haven, CT 06520-8120, USA
- J. Isaak
- ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany
- J.H. Kelley
- Department of Physics, North Carolina State University, Raleigh, NC 27607, USA
- M. Knörzer
- Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
- N. Pietralla
- Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
- V.Yu. Ponomarev
- Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
- C. Romig
- Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
- M. Scheck
- University of the West of Scotland, Paisley PA1 2BE, UK
- H. Scheit
- Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
- J. Silva
- ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany
- A.P. Tonchev
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA
- W. Tornow
- Department of Physics, Duke University and Triangle Universities Nuclear Laboratory, Durham, NC 27708-0308, USA
- F. Wamers
- ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany
- H. Weller
- Department of Physics, Duke University and Triangle Universities Nuclear Laboratory, Durham, NC 27708-0308, USA
- V. Werner
- Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
- A. Zilges
- Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
- DOI
- https://doi.org/10.1016/j.physletb.2016.02.042
- Journal volume & issue
-
Vol. 756,
no. C
pp. 72 – 76
Abstract
The decay properties of the Pygmy Dipole Resonance (PDR) have been investigated in the semi-magic N=82 nucleus 140Ce 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.
Keywords
- γ-ray spectroscopy
- 140Ce
- Pygmy Dipole Resonance
- Nuclear resonance fluorescence
- Coincidence measurement
- Quasi-particle phonon model
