Photodisintegration of quasi-free two-nucleon-system inside nucleus

Momentum spectra of protons in the reaction of γ + Be9 → p + anything in the incident energy range from 180 MeV to 420 MeV were measured by a magnetic spectrometer located at the angle of 250 in the laboratory system. Tagged photons were used as an incident beam. The obtained spectrum showed two peaks which were interpreted to be due to the protons in reactions γ + ''N'' → p + π and γ + ''D'' → p + n, where ''N'' and ''D'' were the quasi-free nucleons and most-likely deuterons inside nucleus. (author)