
doi: 10.1007/bf01380659
Water enriched to 97% in O18 and liquid nitrogen were irradiated with 30,5 MeV bremsstrahlung. The energy distribution of emitted neutrons between 2,5 MeV and 20 MeV was measured via the recoil protons in a stilbene scintillator. The energy spectrum of photoneutrons from N14 shows maxima at 3,0, 6,5 and 11 MeV, whereas that of neutrons from O18 contains only indication of structure. For both nuclei emission of neutrons seems to proceed mainly through transitions into excited levels of the final nuclei.
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