Summary
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.
Riassunto
Si studia lo spettro dei fotoneutroni emessi dall’alluminio irradiato con raggi X con energia massima di 24 e di 30 MeV. I neutroni sono stati rivelati mediante i protoni di rinculo in emulsioni nucleari. Si trova che i fotoni di energia >24 MeV danno luogo prevalentemente a processi di emissione diretta. PerE γmax=30 MeV l’emissione diretta dà alla resa totale (γ, n) un contributo molto notevole (>25%).
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Cortini, G., Milone, C., Papa, T. et al. Photoneutrons from Al.. Nuovo Cim 14, 54–61 (1959). https://doi.org/10.1007/BF02725005
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DOI: https://doi.org/10.1007/BF02725005