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## neutron interaction with a scintillator

Keywords: efficiency, neutrons
Date: 28 Jun, 2006
From: habib <habibovich@hotmail.com>

 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 Re: neutron interaction with a scintillator   (Dennis H. Wright - 06 Jul, 2006)
3 Re: neutron interaction with a scintillator   (Dennis H. Wright - 15 Jul, 2006)
 to: "neutron interaction with a scintillator"
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