Analysis of Coulomb breakup experiments ofB8with a dynamical eikonal approximation

Abstract

Various measurements of the Coulomb breakup of $^{8}\mathrm{B}$ are analyzed within the dynamical eikonal approximation using a single description of $^{8}\mathrm{B}$. We obtain a good agreement with experiment for different observables measured between 40 and 80 MeV/nucleon. A simple $^{7}\mathrm{Be}$-$p$ potential model description of $^{8}\mathrm{B}$ seems sufficient to describe all observables. In particular, the asymmetry in parallel-momentum distributions due to $E1\text{\ensuremath{-}}E2$ interferences is well reproduced without any scaling. The projectile-target nuclear interactions seem negligible if data are selected at forward angles. On the contrary, like in previous analyses we observe a significant influence of higher-order effects. The accuracy of astrophysical $S$ factors for the $^{7}\mathrm{Be}$($p,\ensuremath{\gamma}$)$^{8}\mathrm{B}$ reaction at stellar energies extracted from breakup measurements therefore seems difficult to evaluate.