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Title: The decay pattern of the Pygmy Dipole Resonance of 140Ce

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. In conclusion, a 10% mixing of the PDR and the [2 1 + × PDR] is extracted.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [4] ;  [7] ;  [7] ;  [6] ;  [2] ;  [8] ;  [4] ;  [4] ;  [4] ;  [4] ;  [9] ;  [4] ;  [2] more »;  [10] ;  [5] ;  [2] ;  [5] ;  [11] ;  [7] « less
  1. GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Frankfurt Institute for Advanced Studies FIAS, Frankfurt am Main (Germany); TU Darmstadt, Darmstadt (Germany)
  2. GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Frankfurt Institute for Advanced Studies FIAS, Frankfurt am Main (Germany)
  3. TU Darmstadt, Darmstadt (Germany); GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  4. TU Darmstadt, Darmstadt (Germany)
  5. Duke Univ. and Triangle Univ. Nuclear Lab., Durham, NC (United States)
  6. Yale Univ., New Haven, CT (United States)
  7. Univ. zu Koln, Koln (Germany)
  8. North Carolina State Univ., Raleigh, NC (United States)
  9. Univ. of the West of Scotland, Paisley (United Kingdom); Scottish Univ. Physics Alliance, Glasgow (United Kingdom)
  10. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  11. TU Darmstadt, Darmstadt (Germany); Yale Univ., New Haven, CT (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-695021
Journal ID: ISSN 0370-2693
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 756; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; γ-ray spectroscopy; 140Ce; Pygmy Dipole Resonance; Nuclear resonance fluorescence; Coincidence measurement; Quasi-particle phonon model
OSTI Identifier:
1378506