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Point-contact Andreev-reflection measurements were performed inSmFeAsO_{0.8}F_{0.2} polycrystals with T_c \simeq 53 K. The experimentalconductance curves reproducibly exhibit peaks around \pm 6 mV and shoulders atV \sim 16-20 mV, indicating the presence of two nodeless superconducting gaps.While the single-band Blonder-Tinkham-Klapwijk fit can only reproduce a smallcentral portion of the conductance curve, the two-gap one accounts remarkablywell for the shape of the whole experimental dI/dV. The fits of the normalizedcurves give Delta_1(0) = 6.15 \pm 0.45 meV and Delta_2(0) = 18 \pm 3 meV. Bothgaps close at the same temperature and follow a BCS-like behavior.

Evidence for two-gap nodeless superconductivity in SmFeAsO$_{0.8}$F$_{0.2}$ from point-contact Andreev-reflection spectroscopy