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Forum: Hadronic Processes
Re: Question neutron stimulated gamma spectrum (Tuoyu Cao)
Date: 18 Jan, 2013
From: Koi, Tatsumi <Koi, Tatsumi>

Let' me play some numbers 

water  1cm3 -> 1g
Fe 60PPM -> Fe 6.0E-5 [g]
         -> Fe ~6.5E17 atoms
XS of n + Fe -> 1st Fe* is about ~1 barn at 2.5MeV
Probability of the reaction per neutron (at the energy) is ~6.5E-7.
Estimate number of the reaction for 1M is ~0.65.
But you have 20 for the number. 
This difference is relatively large.

For testing purpose, I enhanced for the contamination level of Fe and Cu to 6000PPM and 2000PPM respectively and comparing the energy spectra, I do not have a lot difference between them. So I could not reproduce your problem. I used the NeutronHP for this. 

Tatsumi

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1 None: Re: neutron stimulated gamma spectrum   (Tuoyu Cao - 23 Jan, 2013)
1 None: Re: neutron stimulated gamma spectrum   (Koi, Tatsumi - 23 Jan, 2013)
1 Question: Re: neutron stimulated gamma spectrum   (Tuoyu Cao - 29 Jan, 2013)
2 None: Re: neutron stimulated gamma spectrum   (michel maire - 24 Jan, 2013)
1 None: Re: neutron stimulated gamma spectrum   (Koi, Tatsumi - 28 Jan, 2013)
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