The Coulomb dissociation of ${}^8\mathrm{B}$ on high-$Z$ targets can be described by first-order perturbation theory at high beam energies but the far-field approximation, which is commonly used, becomes inaccurate at impact parameters less than $\sim 25\mathrm{fm}.$ The leading-order correction at lower beam energies is a dynamic polarization effect, which reduces the dissociation probability. The relative significance of the effect scales roughly as $Z/E$ in terms of the target charge Z and beam energy E. The reduction due to a destructive Coulomb-nuclear interference, on the other hand, is rather modest.

• Received 8 July 2002

DOI:https://doi.org/10.1103/PhysRevC.66.044609