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None Alpha inelastic cross section for different isotope 

Forum: Hadronic Processes
Date: 14 Jun, 2018
From: Ziyi Guo <Ziyi Guo>

Hello dear Geant4 experts,

I am using Geant4.10.04.p01 to simulate a liquid scintillator detector response of alpha particles, and I found that many 12C(alpha,gamma)16O reactions in the simulation, which is not consistent with the experiment result. I tried to run the Hadr03 example, add C12 and C13 materials. The cross section of C12 printed on the screen is like

MeanFreePath:	2.0263 cm  +- 2.0261 cm 	massic: 24.316 g/cm2 
 CrossSection:	0.49351 cm^-1 		massic: 4.1126 mm2/g 
 crossSection per atom:	819.49 mbarn 

 Verification: crossSections from G4HadronicProcessStore:
      alphaInelastic= 4.1286 mm2/g 	822.69 mbarn 
               total= 4.1286 mm2/g 	822.69 mbarn 

 List of nuclear reactions: 

                           alpha + C12 --> N gamma or e- + O16:  200000   Q =  7.1609 MeV

                          number of gamma or e- (ic): N = 0 --> 0

It seems that the cross section is about 820mbarn. However, the cross section of C13 is like

 MeanFreePath:	2.0268 cm  +- 2.0266 cm 	massic: 26.349 g/cm2 
 CrossSection:	0.49338 cm^-1 		massic: 3.7952 mm2/g 
 crossSection per atom:	819.49 mbarn 

 Verification: crossSections from G4HadronicProcessStore:
      alphaInelastic= 3.8101 mm2/g 	822.69 mbarn 
               total= 3.8101 mm2/g 	822.69 mbarn 

 List of nuclear reactions: 

                           alpha + C13 --> N gamma or e- + O17:      25   Q =  6.3576 MeV
                   alpha + C13 --> N gamma or e- + alpha + C13:    5415   Q = 3.9639e-07 eV 
                 alpha + C13 --> N gamma or e- + neutron + O16:  194560   Q =  2.2145 MeV

                          number of gamma or e- (ic): N = 0 --> 0

 This is the same with C12. I also tried some other isotopes, such as Li8, Li9, the results shows that the same element has the same cross section. How can I do with this problem? Thanks.

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1 Idea: Re: Alpha inelastic cross section for different isotope   (Vladimir Ivanchenko - 04 Jul, 2018)
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