Abstract
The energy spectra of photoneutrons emitted at 90° from Al under bremsstrahlung of 24 and 30 MeV maximum energy were investigated by means of the recoil protons in photoemulsions. The difference between the two spectra shows that above 24 MeV photon energy the neutrons are emitted mainly by a direct process. This process gives a relevant contribution (>25%) to the photoneutron yield, at 30 MeV.
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