Message: NeutronHP and Oxygen-16 Not Logged In (login)

Question NeutronHP and Oxygen-16 

Forum: Hadronic Processes
Date: 23 Apr, 2009
From: Cristian Bungau <Cristian Bungau>

Hi, I am trying to simulate neutron propagation in water. Obviously the hydrogen is the most important element to get it right, however there is an issue with the oxygen definition. If I define the oxygen as an element

   a= 16.00*g/mole;
   G4Element* O  = new G4Element("Oxygen"  ,symbol="O" , z= 8., a);

I get the warning that the cross-section data is not found in G4NDL3.13 for the element 8-O-18 (why 18, since I defined the Oxygen element with A=16 ?) and that the program will use the data for 8-O-17 instead.

Now both 8-O-16 and 8-O-17 cross-section data are included in G4NDL3.13, so why can't it use the O-16 data?

Thanks,

Cristian

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None Re: NeutronHP and Oxygen-16  by Calvin Giles <Calvin Giles>,   Oct 16, 06:41
Re: Question NeutronHP and Oxygen-16 (Cristian Bungau)
This may be because it is including the Oxygen isotopes, or because you are using another material that contains oxygen-18, G4_Galactic for example. Try:

G4cout << *(G4Material::GetMaterialTable()) << G4endl;

after you have defined all your materials in your detector construction. Have a look for any isotopes of oxygen and which element they are in.

Calvin

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