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Question How to score no. of secondary neutron from proton beam 

Forum: Hadronic Processes
Date: 18 Sep, 2018
From: Arghya Chattaraj <Arghya Chattaraj>

Hi,
  I am beginner in Geant4. I want to get number of secondary neutron due to incident proton beam (250 MeV pencil beam) on a cylindrical target. I used Multifunctional detector and neutron filter like below

  auto Detector10 = new G4MultiFunctionalDetector("dect_10");
  G4SDManager::GetSDMpointer()->AddNewDetector(Detector10);
 G4VPrimitiveScorer* primitive;
  //primitive = new G4PSTrackLength("TrackLength");
  primitive = new G4PSSphereSurfaceCurrent(psName="Current", fCurrent_In);
  //primitive = new G4PSPassageCellCurrent(psName="Current", fCurrent_In);
  primitive ->SetFilter(neutronFilter);
  Detector10->RegisterPrimitive(primitive);  

  SetSensitiveDetector("detc10LV",Detector10); 

I am getting some score but with RMS value almost 10 times higher than mean value of neutron . I used "FTFP_BERT" physics. Here I am attaching my Detectorconstuction.cc, eventaction.cc and runaction.cc

(Note: I have edited example/basic/B4d according to my requirement.)

Kindly give me some suggestion in this regards that where is the problem ? Need your expert opinion on this please.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/09/18/10.58-82588-4dDetectorConstruction.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/09/18/10.58-55234-B4RunAction.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/09/18/10.58-45443-B4dEventAction.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/09/18/10.58-18243-PrimaryGeneratorAction.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/09/18/10.58-7797-4dActionInitialization.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/09/18/10.58-26503-exampleB4d.cc

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