The decay pattern of the Pygmy Dipole Resonance of Ce-140

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. SilvaA. P. Tonchev, W. Tornow, F. Wamers, H. Weller, V. Werner, A. Zilges

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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 [2+1 x PDR] is extracted.
Original languageEnglish
Pages (from-to)72-76
JournalPhysics Letters B
Volume756
DOIs
Publication statusPublished - 10 May 2016

Keywords

  • gamma-ray spectroscopy
  • Ce-140
  • Pygmy Dipole Resonance
  • Nuclear resonance fluorescence
  • Coincidence measurement
  • Quasi-particle phonon model

Cite this

Löher, B., Savran, D., Aumann, T., Beller, J., Bhike, M., Cooper, N., ... Zilges, A. (2016). The decay pattern of the Pygmy Dipole Resonance of Ce-140. Physics Letters B, 756, 72-76. https://doi.org/10.1016/j.physletb.2016.02.042