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The dipole states of O 16 nucleus are well explained with the theory of the shell model which includes the interaction between one-particle and one-hole. For the valuation of the single-particle excitation model it is important to investigate the decays of the dipole states of O 16 to excited states of a residual N 15 nucleus. An O 16 (γ, p )N 15 reaction experiment was investigated with nuclear emulsions. O 2 natural gas target was irradiated with bremsstrahlung of 23 and 27 MeV maximum energies from a 31 MeV betatron. The energy distributions were obtained. Almost of the 22.2 MeV state did not decay to the positive parity doublet of N 15 at 5.3 MeV and more than the 90% of the 24.6 MeV state decayed to the ground state and the third excited state. The results of the present work well agreed with some other experiments.
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