Two-Phonon Background for the Double Giant Resonance

1997/06/25 by V. Yu. Ponomarev, C. A. Bertulani · 1 citation
Physics and Astronomy · #Atomic and Molecular Physics #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #nucl-th

paper · pdf · doi:10.1103/physrevlett.79.3853

published as Phys.Rev.Lett.79:3853-3856,1997 · 6 pages, 2 Postscript figures

arxiv created 1997/06/25 · openalex publication_date 1997/11/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The direct excitation of a ``sea'' of two-phonon configurations above 15 MeV from the ground state is considered. It is concluded that these configurations form a flat physical background in photoexcitation cross sections and Coulomb excitation in heavy ion reactions at relativistic energies. The contribution of the background to the total cross section in Coulomb excitation of ²⁰⁸Pb in the double giant dipole resonance (DGDR) energy region is about 15%. It should be considered while drawing conclusions on anharmonicity effects for the DGDR.

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