Abstract
We have deduced the coherent scattering amplitude of $^{46}\mathrm{Ca}$ as 3.55\ifmmode\pm\else\textpm\fi{}0.21 fm by measuring the neutron-diffraction patterns of calcite enriched to 32% in $^{46}\mathrm{Ca}$. We have employed this value in calculating the direct-capture cross sections of the primary electric-dipole \ensuremath{\gamma} transitions in $^{47}\mathrm{Ca}$ using optical-model potentials with physically realistic parameters. The calculated cross sections agree reasonably well with measurements showing that thermal-neutron capture by $^{46}\mathrm{Ca}$ is controlled largely by a simple direct mechanism.
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