In order to use Coulomb breakup as a spectroscopic tool, the accuracy of breakup model calculations needs to be examined. The coupled discretised continuum channels (CDCC) method is widely used, and I report on its convergence and accuracy. One confirmation of its convergence is that it reproduces analytic solutions where these are known, such as the elastic scattering from the Johnson special three‐body model. The CDCC results are also compared with those from Bremsstrahlung, time‐dependent and DWBA models, and comments are made about the correct description of one‐step DWBA for Coulomb breakup. The convergence of CDCC at low beam energies is shown with respect to increasing model space, as well as evidence for the accuracy of the converged solution.
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