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None neutron interaction with a scintillator 

Keywords: efficiency, neutrons
Forum: Hadronic Processes
Date: 28 Jun, 2006
From: habib <>

hello everybody,

i am trying to find the neutron detection efficiency of a C10H13

plastic scintillator. i am using geant4.8 version.

my simulations results are compared to the theoretical results of

the efficiency calculated using this formula :

efficiency = [(n_H *Sigma_H / n_H *Sigma_H + n_C *Sigma_C )]*[1-exp(-(n_H *Sigma_H + n_C *Sigma_C )*L)]

with n_H = number of hydrogen atoms per cm^3
     n_C = number of carbon atoms per cm^3
     Sigma_H = elastic scaterring cross section of the neutron on Hydrogen 
     Sigma_C = elastic scaterring cross section of the neutron on Carbon
     L = thickness of the scintillator

the efficiency found is that of the detection of the recoil protons (scattered)

here are the results :

1 MeV neutrons : 1-)))) formula ====> efficiency = 19 % --------------------

                          2-)))))     simulation using my own physic list and  
                    G4HadronElasticProcess* theElasticProcess = new G4HadronElasticProcess() ;  
                    G4LElastic* theElasticModel = new G4LElastic() ;  
                    theElasticProcess->RegisterMe(theElasticModel) ;  

                                             =====> efficiency = 15.4 %

                          3-)))))     simulation using LHEP_PRECO physic list

                                            =====> efficiency = 29.5 %

does anyone had any idea about the differences found ?????? which physic list i should use (mine or LHEP_PRECO) ???

i don t think the problem is in my simulation code because i tried to simulate gammas in place of neutrons and i compared my results

to geant3 simulations and the results were exact

thanks in advance

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1 None: Re: neutron interaction with a scintillator   (Dennis H. Wright - 06 Jul, 2006)
3 None: Re: neutron interaction with a scintillator   (Dennis H. Wright - 15 Jul, 2006)
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