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None Cross sections of the reaction Al(p,x)26Al and Si(n,x)26Al calculated by Geant4 are different with experimental data. 

Forum: Hadronic Processes
Date: 20 Aug, 2015
From: liyong <liyong>

Hi,

I calculated the cross sections of the reaction Al(p,x)26Al and Si(n,x)26Al based on the Example/Hadr03 with Geant4.10.1. In comparison with the experimental data in the published works (Nishiizumi et al., 2009; Reedy 2013) we can find there is a great difference. The comparisons are shown in the Figs attached at bottom.

Q1: Please have a look whether it is right to calculate the cross section in the following way. I modified the example/Hadr03. I set the material as Aluminum, chose the G4HadronPhysicsQGSP_BIC_HP as the Hadron Inelastic physics model and used proton as the particle source. I change the energy of incident protons each time. For example, when the energy of incident proton is 100MeV, we get the following output file.

>>Proton+Al
>>>>>>>>Energy 100 MeV  Number:10000
hadElastic= 4851	protonInelastic= 5149
MeanFreePath:	21.13 cm  +- 20.94 cm 	massic: 57.052 g/cm2 
 CrossSection:	0.047325 cm^-1 		massic: 1.7528 mm2/g
crossSection per atom:	785.32 mbarn
Verification: crossSections from G4HadronicProcessStore:
          hadElastic= 846.82 um2/mg	379.41 mbarn 
     protonInelastic= 910.64 um2/mg	408 mbarn 
               total= 1.7575 mm2/g 	787.41 mbarn
Al26(produced in the reactions):   942

We can see there are 5149 protonInelastic reactions, the cross section of protonInelastic is 408 mbarn and 942 Al26 were produced. Then I get the cross section of Al(p,x)26Al, CS=942/5149*408mbarn.

Q2. If my calculation is reasonable, what can I do with the difference between Geant4 and the experimental data? I need the accurate production of Al26. Is there any way to simulate the production of Al26 using the experimental data?

Sorry for my poor English and my long question, I hope you can get my mean.

Thank you

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/08/20/19.45-35756-Al-px-Al26.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/08/20/19.45-90232-Si-nx-Al26.png

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1 None: Re: Cross sections of the reaction Al(p,x)26Al and Si(n,x)26Al calculated by Geant4 are different with experimental data.   (Daren Sawkey - 21 Aug, 2015)
(_ None: Re: Cross sections of the reaction Al(p,x)26Al and Si(n,x)26Al calculated by Geant4 are different with experimental data.   (Jose Manuel Quesada - 22 Aug, 2015)
1 Idea: Re: Cross sections of the reaction Al(p,x)26Al and Si(n,x)26Al calculated by Geant4 are different with experimental data.   (Vladimir Ivanchenko - 23 Aug, 2015)
2 Question: Re: Cross sections of the reaction Al(p,x)26Al and Si(n,x)26Al calculated by Geant4 are different with experimental data.   (liyong - 31 Aug, 2015)
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