Multiple excitation of giant dipole resonances in relativistic heavy ion collisions

V. Yu. Ponomarev; E. Vigezzi; P. F. Bortignon; R. A. Broglia; G. Colò; G. Lazzari; V. V. Voronov; G. Baur

doi:10.1103/PhysRevLett.72.1168

Multiple excitation of giant dipole resonances in relativistic heavy ion collisions

V. Yu. Ponomarev, E. Vigezzi, P. F. Bortignon, R. A. Broglia, G. Colò, G. Lazzari, V. V. Voronov, and G. Baur

Phys. Rev. Lett. 72, 1168 – Published 21 February 1994

Abstract

The relativistic excitation of the double giant dipole resonance in ${}^{136}{Xe}$ has been calculated, describing the resonance as a harmonic vibration of the mean field, damped through its coupling to doorway states. While the predictions associated with the one-phonon states provide an overall account of the experimental findings, the calculated cross section for the two-phonon states is much smaller than that extracted from the involved analysis of the data. The experimental elucidation of this discrepancy seems essential for assessing the validity of the standard picture of giant resonances.

Received 23 September 1993

DOI:https://doi.org/10.1103/PhysRevLett.72.1168

Authors & Affiliations

V. Yu. Ponomarev, E. Vigezzi, P. F. Bortignon, R. A. Broglia, G. Colò, G. Lazzari, V. V. Voronov, and G. Baur

Istituto Nazionale di Fisica Nucleare, Sezione di Milano, via Celoria 16, 20133 Milano, Italy
Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Head Post Office, P.O. Box 79, Moscow, Russia
Dipartimento di Fisica, Università di Milano, via Celoria 16, 20133 Milano, Italy
The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen O/, Denmark
Institut fur Kernphysik, Forschungzentrum Jülich GmbH, Germany