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Using the $R$-matrix approach we calculate the radiative width for aresonance decaying to a bound state through electric dipole, $E1$, transitions.The total radiative width is determined by the interference of the nuclearinternal and external radiative width amplitudes. For a given channel radiusthe external radiative width amplitude is model independent and is determinedby the asymptotic normalization coefficient (ANC) of the bound state to whichthe resonance decays. It also depends on the partial resonance width. Tocalculate the internal radiative width amplitude we show that a single particlepotential model is appropriate. We compare our results with a few experimentaldata.

Internal and external radiative widths in the combined R-matrix and potential model formalism