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Forum: Hadronic Processes
Re: Question Modifying alpha-energy in radioactive decay (Kseniia Rezynkina)
Date: 27 Jun, 2014
From: Laurent Desorgher <Laurent Desorgher>

Dear Kseniia,

Indeed the QValue in the G4RadDecay file is only informative for the case of alpha decay and is directly computed in the decay code G4GeneralPhaseSpaceDecay::TwoBodyDecayIt(). There is no way to change that value as it is correctly calculated in the code from the mass of the mother and the two daughters.

Best regards

Laurent

On Thu, 26 Jun 2014 15:24:22 GMT, Kseniia Rezynkina wrote:

> Hello,
> 
> I'm trying to modify the alpha energy in my simulations with radioactive
> decay. I assumed that it should be enough to change the Q-value in
> radiation decay file, here (last column):
> 
> # 210RA (   3.7 S   )
> # modified by Kseniia Rezynkina, 24/06/2014
> #
> #  Excitation   Halflife Mode         Daughter Ex             Intensity           Q
> P       0.0000   3.7000e+00
>                              Alpha                       0.0000                 1.0000e+00
>                              Alpha                      0.0000                  9.9970e+01   7160.3833 
>                              Alpha              575.3000        3.0000e-02    6577.2816 
> P    2053.5000   2.2400e-06
>                                 IT                      0.0000                  1.0000e+00
> 
> But playing with this number has absolutely no effect on the energy of
> alpha particle.
> 
> Same problem with Cf238 in example rdecay01.
> 
> So, I guess it's not the Q-value that defines the alpha energy in
> Geant4. Could you tell me how do I modify it then?
> 
> Kseniia
> 

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