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The reactions 12 (,n) 3 2 and 16 O(,n) 3 He3 is investigated by a method that employs a diffusion chamber placed in a magnetic field and irradiated by a beam of bremsstrahlung photons with an end-point energy of 150 MeV. In the excitation curve for the 2 system, a resonance is found, and this resonance identified as the ground state of the 8 Be nucleus. The parameters of the-quantum and neutron are calculated, and the partial channels 12 (,n) 3 8 0 and 16 O(,n) 3 He 8 0 reactions are singled out. It is shown that these reactions proceed according a sequential-type scheme with the formation of one or several unresolved excited states of 11 C and 15 O nuclei at the first step. The total cross section of the reactions was determined and a similarity in their behavior was found for E > 55 MeV. A jumplike change in the dependence of the kinetic energy of the neutron on E in different energy intervals of thequantum was observed.

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