Abstract
Strong direct processes were observed for elastic breakup in 54-MeV $^{7}\mathrm{Li}$${+}^{12}$C $^{197}\mathrm{Au}$ reactions. In the case of $^{12}\mathrm{C}$, the observed $^{7}\mathrm{\ensuremath{\alpha}}$+t direct-breakup yield was significantly larger than predicted by a Coulomb-breakup calculation, indicating the importance of the nuclear field. For $^{197}\mathrm{Au}$, final-state interactions produced a strong distortion in the fragment energy spectra, as well as a modulation of the coincidence efficiency for different detector geometries. Such Coulomb effects are found to severely complicate the extraction of radiative-capture cross sections from direct-breakup data.
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