Abstract
The electromagnetic excitation of the two-phonon isovector giant dipole resonance in relativistic projectiles incident on heavy targets can 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 + states to the total cross sections.
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