Measurement of neutron flux produced by proton

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1

Dear Fluka experts：
In my simulation, I’m using 218MeV proton to hit a 303030cm^2 water phantom through a universal range shifter(PMMA) to see the neutron information.
x+.flair (6.4 KB)

According to previous studies, there should be three peaks in the neutron flux spectrum(Thermal, Evaporation, Direct).

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But, I can only see the thermal peak in my simulation.
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It’s there something wrong with my configurations?

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Dear Nicolas

You compare two different quantities. The role model plot shows the result in something which is called lethargy presentations, which is consistent with Fluence *E. In your plot you show differential fluence (particles/cm2 per MeV). If you chose in Flair the following parameter <X>*Y for printing your histogram to show your result in lethargy representation, then the resulting plot will be much more similar to your role model plot and higher energies will appear.

I hope this helps a bit

Best regards
Helmut

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Dear Vincke:
Problem soved! Thanks!