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Coulomb breakup is used to infer radiative-capture cross sections atastrophysical energies. We test theoretically the accuracy of this indirecttechnique in the particular case of 15C, for which both the Coulomb breakup to^{14}C+n and the radiative capture 14C(n,{\gamma})15C have been measured. Weanalyse the dependance of Coulomb-breakup calculations on the projectiledescription in both its initial bound state and its continuum. Our calculationsdepend not only on the Asymptotic Normalisation Coefficient (ANC) of the 15Cground state, but also on the 14C-n continuum. This questions the methodproposed by Summers and Nunes [Phys. Rev. C 78, 011601 (2008), ibid. 78, 069908(2008)], which assumes that an ANC can be directly extracted from thecomparison of calculations to breakup data. Fortunately, the sensitivity to thecontinuum description can be absorbed in a normalisation constant obtained by asimple {\chi}2 fit of our calculations to the measurements. By restricting thisfit to low 14C-n energy in the continuum, we can achieve a better agreementbetween the radiative-capture cross sections inferred from the Coulomb-breakupmethod and the exact ones. This result revives the Coulomb-breakup technique toinfer neutron radiative-capture capture to loosely-bound states, which would bevery useful for r- and s-process modelling in explosive stellar environments.

From the Coulomb breakup of halo nuclei to neutron radiative capture