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Quenching of 1"+ excitations in the double giant resonance

By C.A. Bertulani, V.Yu. Ponomarev, V.V. Voronov and Darmstadt (Germany) Gesellschaft fuer Schwerionenforschung mbH

Abstract

The electromagnetic excitation of the two-photon isovector giant dipole resonance in relativistic projectiles incident on heavy targets can be proceed via several intermediate 1"- one-phonon giant resonance states. In two step electric dipole transitions the population of 0"+, 1"+, and 2"+ two-phonon states are possible. We calculate the amplitude distribution of 1"- excitations with an RPA formalism, and use it to calculate the electromagnetic excitation of two-phonon states in second order perturbation theory and coupled-channels. We show that a conspiracy between angular momentum coupling and the strength of the electromagnetic fields suppresses contributions of 1"+ state to the total cross sections. (orig.)Available from TIB Hannover: RO 801(96-25) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Topics: 20C - Nuclear physics, particle accelerators, GIANT RESONANCE, E1-TRANSITIONS, PHONONS, ROTATIONAL STATES, INTERMEDIATE RESONANCE, INTERMEDIATE STATE, TRANSITION AMPLITUDES, RANDOM PHASE APPROXIMATION, RELATIVISTIC RANGE, PERTURBATION THEORY, COUPLED CHANNEL THEORY, INTEGRAL CROSS SECTIONS, LEAD 208 REACTIONS, LEAD 208 TARGET, LEAD 208, GEV RANGE 100-1000, ENERGY SPECTRA, THEORETICAL DATA, STRENGTH FUNCTIONS, QUASI-ELASTIC SCATTERING, GIANT RESONANCES, RPA CALCULATIONS, NUCLEAR REACTION THEORY, NUCLEI WITH MASS NUMBER 190 TO 219, HEAVY ION NUCLEUS SCATTERING, NUCLEAR TRANSITION PROBABILITIES, NUCLEAR STRUCTURE THEORY, NUCLEAR STRUCTURE
Year: 1996
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Provided by: OpenGrey Repository
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