Simulations of the deuteron photodisintegration reaction and for its background have been performed using the LNF EG for photoreactions, Gsim and finally Recsis. We ran the Gsim code for 600 MeV, 1.5 GeV and 2 GeV of photon energies. The following plots refer to the 1.5 GeV simulation.
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Missing mass spectrum for gamma d -> p X(n). The solid line refers to the reconstructed sample while the dashed line to the generated sample ( the background coming from the target is taken into account) |
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Missing mass spectrum for gamma d -> p X(n) versus
teta in the CLAS system. The black points are from the generated sample
while the green points are from the reconstruction of the
generated sample. The red points comes from another
simulation which includes only the channels with a nucleon and a pion in the final state
as: (gamma-p (n) ---> pi0 p (n)) and (gamma-n (p) ---> pi- p (p)) |
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Upper plot: Ratio between the reconstructed momentum and the
generated momentum for protons Lower plot: Comparison between generated proton momentum and reconstructed proton momentum (blue line). The low energy peak corresponds to the case in which the gamma interacts with the neutron and the proton goes out with small momentum and it is not reconstructed. |
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Difference between reconstructed and generated angles for protons in the CLAS system. |