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Forum: Particles
Re: Question Polarization of protons (Eleni Petrakou)
Re: Feedback Re: Polarization of protons (Gumplinger Peter)
Re: None Re: Polarization of protons (Eleni Petrakou)
Date: 11 Feb, 2016
From: Gumplinger Peter <Gumplinger Peter>

Hi Eleni,

> After what you said, I'd like to see if my understanding about the polarization 
> of massive particles in G4 is correct: 
> 
> In the presence of external e/m fields, a particle's spin precesses as expected.

yes

> In decays, the polarization is taken into account for the kinematics of the 
> decay products. 

The only decay process in G4 that takes the particle's spin into account is the muon decay - and only - when the user has specified G4DecayWithSpin to replace the ordinary G4Decay:

http://www-geant4.kek.jp/lxr/source/physics_lists/constructors/decay/src/G4SpinDecayPhysics.cc#L107

> Scatterings of any kind do not affect the spin vector.

Yes, except there are some specialized processes that either affect the polarization or take it into account. Those are in /processes/electromagnetic/polarisation

And there are polarized optical photons, phonons and ultra-cold neutrons.

Peter

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1 None: Re: Polarization of protons   (Eleni Petrakou - 12 Feb, 2016)
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