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Gross, intermediate and fine structure of nuclear giant resonances: Evidence for doorway states

  • Peter von Neumann-CoselEmail author
  • Vladimir Yu. Ponomarev
  • Achim Richter
  • Jochen Wambach
Regular Article - Experimental Physics
  • 17 Downloads
Part of the following topical collections:
  1. Giant, Pygmy, Pairing Resonances and Related Topics

Abstract.

We review the phenomenon of fine structure of nuclear giant resonances and its relation to different resonance decay mechanisms. Wavelet analysis of the experimental spectra provides quantitative information on the fine structure in terms of characteristic scales. A comparable analysis of resonance strength distributions from microscopic approaches incorporating one or several of the resonance decay mechanisms allows conclusions on the source of the fine structure. For the isoscalar giant quadrupole resonance (ISGQR), spreading through the first step of the doorway mechanism, i.e. coupling between one particle-one hole (1p1h) and two particle-two hole (2p2h) states is identified as the relevant mechanism. In heavy nuclei it is dominated by coupling to low-lying surface vibrations, while in lighter nuclei stochastic coupling becomes increasingly important. The fine structure observed for the isovector giant dipole resonance (IVGDR) arises mainly from the fragmentation of the 1p1h strength (Landau damping), although some indications for the relevance of the spreading width are also found.

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Copyright information

© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Peter von Neumann-Cosel
    • 1
    Email author
  • Vladimir Yu. Ponomarev
    • 1
  • Achim Richter
    • 1
  • Jochen Wambach
    • 1
    • 2
  1. 1.Institut für KernphysikTechnische Universität DarmstadtDarmstadtGermany
  2. 2.European Centre for Theoretical Studies in Nuclear Physics and related Areas (ECT*) and Fondazione Bruno KesslerVillazzano (TN)Italy

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