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We report 75As-NMR study on the Fe-pnictide high-Tc superconductorY0.95La0.05FeAsO_{1-y} (Y0.95La0.051111) with Tc=50 K that includes no magneticrare-earth elements. The measurement of the nuclear-spin lattice-relaxationrate 75(1/T1) has revealed that the nodeless bulk superconductivity takes placeat Tc=50 K while antiferromagnetic spin fluctuations (AFSFs) develop moderatelyin the normal state. These features are consistently described by the multiplefully-gapped s_\pm-wave model based on the Fermi-surface (FS) nesting.Incorporating the theory based on band calculations, we propose that the reasonthat Tc=50 K in Y0.95La0.051111 is larger than Tc=28 K in La1111 is that the FSmultiplicity is maximized, and hence the FS nesting condition is better thanthat in La1111.

High-Tc Nodeless s_\pm-wave Superconductivity in (Y,La)FeAsO_{1-y} with Tc=50 K: 75As-NMR Study