[en] The reaction cross section of ⁵⁶Fe (γ, α₀) was measured from the electron energy of 15 to 25 MeV. The measured data were compared with the calculated ones based on statistic theory. Both agreed with each other. Therefore, affirmative result was obtained for the presumption that the reaction of (γ, α₀) of the nuclei around these energy levels can be explained by the statistical theory. The angular distribution of ⁵⁶Fe (γ, α₀) with 17 MeV electron energy was also measured, and E2/E1 ratio was obtained. In the measurement of ⁵⁶Fe ( Gamma , α₀) reaction cross section, a natural target of 2.69 mg/cm² was irradiated with the electron beam with energy from 15 MeV to 25 MeV at intervals of 0.5 MeV, and the emitted α particles were detected by a broad band magnetic distribution meter. The measured cross section of (γ, α₀) reaction agreed with the calculated one based on statistical theory. If this fact is recognized in many nuclei, the cross section of (γ, α₀) reaction of those nuclei has the following characteristics. When the increasing rate of the product of a complex nucleus formation cross section and α₀ penetration factor is larger than that of the sum of all penetration factors of possible channels, the cross section of (γ, α₀) reaction increases, and takes a peak value when above two increasing rates agree with each other. (Tai, I.)