123 and 151 MeV gammas are incident upon a C target. The invariant proton cross sections are measured vs. angle and k, which is the average of the proton's kinetic energy and momentum. - Data Reference: C. Van den Abeele, private communication cited in Jan Ryckebusch et al., Phys. Rev. C49, 2704 (1994).
Simulation Conditions - Geant4 version: 6.1
- Models: CHIPS
Comments - Data: red circles, model prediction: histogram
- E_gamma = 123 MeV:
- 57 degrees: model under-estimates data by 50% in places
- 77 degrees: good agreement, all energies
- 97 degrees: model over-estimates by 30-50%
- 117 degrees: model generally over-estimates by 30-50%, and over-shoots observed energy cut-off
- 127 degrees: model over-estimates data by 50-100% and over-shoots observed energy cut-off
- E_gamma = 151 MeV:
- 57 degrees: model under-estimates data by 50% between 220 and 260 MeV
- 77, 97 degrees: good agreement up to 260 MeV, model over-estimates at higher energies
- 117, 127 degrees: model over-estimates data by 50-70% and overshoots cut-off
Summary - The CHIPS model reproduces the shape of the produced proton spectra, with the exception of over-shooting the endpoint at larger angles. Typical disagreements with data are 0-50%.
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