Higher Order Effects in Electromagnetic Dissociation of Neutron Halo Nuclei

We investigate higher order effects in electromagnetic excitation of neutron halo nuclei using a simple and realistic zero range model for the neutroncore interaction. In the sudden (or Glauber) approximation all orders in the target-core electromagnetic interaction are taken into account. Small deviations from the sudden approximation are readily calculated. We obtain very simple analytical results for the next to leading order effects, which have a simple physical interpretation. For intermediate energy electromagnetic dissociation, higher order effects are generally small. We apply our model to Coulomb dissocation of 19C at 67 A·MeV. The analytical results are compared to numerical results from the integration of the time dependent Schrödinger equation. Good agreement is obtained. We conclude that higher order electromagnetic effects are well under control. 25.70.De, 25.70.Mn, 25.60.-t Typeset using REVTEX