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Question wrong gammas from neutron capture on Ni or Fe 

Keywords: gammas neutron capture nickel iron
Forum: Hadronic Processes
Date: 21 Feb, 2007
From: Amanda Porta <porta@to.infn.it>

Hi everybody,
I'm writing you because I found some stange results in sinulating gamma 
capture on Nickel or Iron. As an example: when my thermal neutron is 
captured by  58Ni it gives the 59Ni and only one gamma of energy 0.494 MeV.
I have tried to understand what was going wrong looking in G4NeutronHPPhotonDist.cc.
I found that when I use a light element as target, for examples 12C, 
the corresponding data contained in the file 6_12_Carbon are read
correctly (10 levels: one with probalily 0.68, two with probability 0.32 and 
the others with probability 0). 
Instead when I use the 58Ni target, it seem to me that the data are not 
read correctly. When the G4NeutronHPPhotonDist.cc class reads the data 
file 28_58_Nickel it finds only one level (variable nDriscete) with 
probalility (variable current = theYield[i].GetY(anEnergy)) 1. 53277, 
ignoring the other information repeorted in the file.
I suppose that the problem could be that the format of the two data files is 
considered equal from the G4NeutronHPPhotonDist.cc class, but it isn't. 
They look quite different if you compare the two files.
If this is the problem how can I read the data file 28_58_Nickel?
What's the meaning of the different numbers of this file?
I found the same problem also on the other Ni isotopes and on the iron 
isotopes.
Thank you in advance for you help.
Yours faithfully,
Amanda Porta

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