Abstract
The ( gamma ,n)-reactions on carbon and oxygen were studied using the 30.5-Mev bremsstrahlung beam of the Heidelberg betatron. The photoneutrons were detected via the recoil protons in a stilbene scintillator. The pulse height spectrum of scintillations produced in the stilbene crystal by the recoil protons was analyzed to yield the incident neutron energy distribution. The gamma and electron background was strongly reduced through pulse shape discrimination. To test the apparatus the spectrum of the neutrons from a Po- alpha -Be source was measured. The energy spectrum of the photoneutrons from O/sup 16/ showed clearly two peaks at excitation energies of 22.4 and 24.4 Mev also seen in the photoproton spectra. The energy distribution of the neutrons from C/sup 12/( gamma ,n) also contained indication of structure already known from the proton spectra from C/sup 12/( gamma ,p). The derived cross sections of C/sup 12/( gamma ,n/sub 0/) and O/sup 16/( gamma ,n/sub 0/) coincided as well in their shape as in their absolute magnitude with the corresponding ( gamma ,p/sub 0/)-cross sections. In both C/sup 12/( gamma ,n) and O/sup 16/( gamma ,n)-reaction the neutrons seem to leave the final nucleus mainly in its ground state. (auth)
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