Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2001-09-10
Phys.Lett.B519:8-14,2001
Physics
Nuclear Physics
Nuclear Experiment
submitted to Phys. Lett. B
Scientific paper
10.1016/S0370-2693(01)01084-X
The production of hard photons and neutral pions in 190 MeV proton induced reactions on C, Ca, Ni, and W targets has been for the first time concurrently studied. Angular distributions and energy spectra up to the kinematical limit are discussed and the production cross-sections are presented. From the target mass dependence of the cross-sections the propagation of pions through nuclear matter is analyzed and the production mechanisms of hard photons and primordial pions are derived. It is found that the production of subthreshold particles proceeds mainly through first chance nucleon-nucleon collisions. For the most energetic particles the mass scaling evidences the effect of multiple collisions.
Aphecetche L.
Bacelar J.
d'Enterria David
Delagrange H.
Hoefman M.
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