The decay pattern of the Pygmy Dipole Resonance of $^{140}$Ce

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Löher, B. ; Savran, D. ; Humby, P. ; Isaak, J. ; Kelley, J. H. ; Knörzer, M. ; Pietralla, N. ; Ponomarev, V. Yu. ; Romig, C. ; Scheck, M. ; Scheit, H. ; Silva, J. ; Aumann, T. ; Tonchev, A. P. ; Tornow, W. ; Wamers, F. ; Weller, H. ; Werner, V. ; Zilges, A. ; Beller, J. ; Bhike, M. ; Cooper, N. ; Derya, V. ; Duchêne, M. ; Endres, J. ; Hennig, A. (2016)
  • Publisher: North-Holland Publ.
  • Journal: volume 756, pages 72-76 (issn: 1873-2445 0370-2693, eissn: 1873-2445)
  • Related identifiers: doi: 10.1016/j.physletb.2016.02.042, doi: 10.15120/GSI-2017-00135
  • Subject: Nuclear resonance fluorescence | Coincidence measurement | 140Ce | Pygmy Dipole Resonance | 140 Ce | Physics | γ-ray spectroscopy | Quasi-particle phonon model | QC1-999 | γ -ray spectroscopy | Nuclear and High Energy Physics
    • ddc: ddc:530

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.
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