|Message: Re: neutron beam hit Zinc target||Not Logged In (login)|
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On Thu, 28 Feb 2013 03:56:02 GMT, Tuoyu Cao wrote:
> I used a 2.5 MeV neutron beam to hit a zinc target and analyse the > gammas. I defined zinc material based on zinc isotopes.
And what was your material definition? Natural zinc (material G4_Zn from the so-called "NIST" database) is 48.63% Zn-64, 27.9% Zn-66, 18.75% Zn-68, and a little bit of other isotopes.
> I saw the biggest peak in the > gamma spectrum is on 1115.5 keV, which comes from Zn65->Cu65+gamma.
From reading your tracking dump:
> * G4Track Information: Particle = Zn65[0.0], Track ID = 2, Parent ID = 1
The Zn65 came from the initial neutron, either by capture on Zn-64 or by spallation (n,2n) on Zn-66. Did that event contain a second neutron?
In other events, you should have also seen some Zn-67 and Zn-69 production in the same way.
-- Michael Kelsey
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