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Forum: Hadronic Processes
Re: Question Angular distribution from Hadronic process (Pierre Morfouace)
Re: None Re: Angular distribution from Hadronic process (Michael H. Kelsey)
Date: 18 Jul, 2016
From: Pierre Morfouace <Pierre Morfouace>

Dear Michael, Thank you for your answer.

What I am doing exactly is that after 1 mm thick of Sn I detect the particle at backward and forward angle in some plastic volumes. What I am plotting is the detected angle in the plastic volume. With those volumes I reconstruct also the kinetic energy of the simulated protons and I have a peak that corresponds to the initial energy of the simulated proton. The counts at large angle correspond to lower reconstructed energy and I do agree that those events correspond to event where a nuclear interaction happened. But when selecting the good reconstructed events and making the ratio of the angular distribution I was expecting a plot like sigma/sigma_R where the ratio decrease a lot after the grazing angle.

I attached here the angular distribution when I select the good reconstructed energy, In that case here 60 MeV proton, as well as the ratio of both distribution. As you can see the distribution including the nuclear reaction is lower than the one with only elastic process.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/07/18/11.44-6198-AngularDist.pdf
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/07/18/11.44-53096-Ratio.pdf

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