PHOTOPROTONS FROM CARBON
Energy and angular distributions of protons ejected from C/sup 12/ targets bombarded by the beam of the Stanford Mark II accelerator were measured by a magnetic spectrometer. The energy distributions, which are peaked at 6.0 Mev, show a structure that cannot be explained by a single resonance. Supposing that all transitions leave the residual nucleus in the ground state, the analysis of the proton distributions leads to a cross section which has a peak value of (12.7 plus or minus 2.5) mb and values (41 plus or minus 9) Mev - mb and (77 plus or minus 18) Mev - mb when integrated from 0 to 24 and 40 Mev, respectively. Except for the peak value, the cross section curve is very similar to that of the C/sup 12/( gamma , n) reaction. The angular distributions of the ( gamma , p) and (e, e'p) reactions were measured for different proton energy groups at an electron energy of 40 Mev. Except for a cos theta term, the distributions are in agreement with the independent particle picture of the giant resonance, p- to d-wave transitions being the important ones. The results are also a confirmation of the theory of electron induced reactions. Yield curves as a function of electron energy were measured up to 40 Mev, for different proton energy groups and at different angles. Analysis of the yield curves leads to differential cross sections as a function of photon energy. The main property of these cross sections is to support to some extent the assumption of exclusively ground state transitions. (auth)
- Research Organization:
- Rijksuniversiteit, Ghent
- NSA Number:
- NSA-15-030028
- OSTI ID:
- 4835696
- Journal Information:
- Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 26
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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