Coulomb excitation of the giant dipole resonance in hadron scattering

doi:10.1016/0375-9474(82)90332-3

Nuclear Physics A

Volume 377, Issue 1, 15 March 1982, Pages 261-267

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Abstract

The excitation of the isovector giant dipole resonance by the Coulomb force is investigated within a DWBA approach using analytic forms for the asymptotic Coulomb integrals. Scattering of d, ³He and α-particles from ²⁰⁸Pb is discussed for which recently small-angle data have been published. For most scattering systems dipole excitation is small; the inclusion of nuclear form factors gives rise to a large interference between Coulomb and nuclear excitation. A strong increase of Coulomb excitation at higher incident energies is obtained.

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Recently there has been some confusion over the excitation of “isovector” giant resonances by isoscalar probes. We present a unified theoretical description of macroscopic models that may be used to calculate the excitation of giant resonances by inelastic scattering so as to clarify this and related questions. Particular attention is given to the relative phase of the Coulombic and hadronic contributions. After describing models for the transition densities that are based upon certain sum rules, a folding model and a deformed optical potential model for the transition potentials are discussed. Applications are made to some examples of inelastic α-particle scattering and the two models are compared. Folding yields cross sections for the breathing-mode monopole resonance that are smaller than those from the potential model by almost a factor of two, so that the measured values appear to require more than 100% depletion of the sum rule. It is suggested that this might be due to neglect of density dependence in the effective interaction.
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^†: On leave from the Institute of Experimental Physics, University of Warsaw, Poland.

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Coulomb excitation of the giant dipole resonance in hadron scattering

Abstract

Phys. Lett.

Nucl. Phys.

Phys. Lett.

Phys. Rev. Lett.

Z. Phys.

Phys. Rev.

Rev. Mod. Phys.