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Forum: Hadronic Processes
Re: Question neutron beam hit Zinc target (Tuoyu Cao)
Re: None Re: neutron beam hit Zinc target (Michael H. Kelsey)
Re: Question Re: neutron beam hit Zinc target (Tuoyu Cao)
Re: None Re: neutron beam hit Zinc target (Michael H. Kelsey)
Re: Question Re: neutron beam hit Zinc target (Tuoyu Cao)
Date: 01 Mar, 2013
From: Michael H. Kelsey <Michael H. Kelsey>

Tuoyu Cao writes:
> The problems is that G4 says it does not have data for individual zinc
> isotopes, so no matter what is my definition, the code just uses nature
> zinc instead.

Ah, ha!  You must be using Geant4 9.4 or earlier for your studies.  In 9.6,
the G4NDL libraries include individual isotopic data for zinc.  But in 9.4,
G4NDL 3.14 uses "natural zinc" for all processes except "isotope
production".

> I am using Shielding physics, it seems to use G4NDL for
> neutron hadronic physics.

Yes, the Shielding list includes NeutronHP, and uses the G4NDL database for
cross-sections. 

> I guess I need to use another physics lists or other database rather than
> the default to get data for individual isotopes. Do you have suggestions
> for this.

See above.  You'll need to move to a more recent version of G4, such as
9.6-patch-01, to get the individual isotope data.  The isotopic information
for zinc was introduced with G4NDL4.1, so you'll need at least the G4 9.5
release (the 4.x and 3.x data libraries have different formats: older code
can't read the new format).

> And it seems like Zn65 is a recoil but Zn65 is not an stable isotope and
> does not exist in nature zinc. Maybe it is a production by previous
> incident neutrons? which not seems to be very likely....

Not possible.  Unless you wrote special code to modify the material in your
geometry during the job, nuclei produced as tracks disappear at the end of
each event, and do not contribute to future event interactions.

      -- Mike

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