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Forum: Fields: Magnetic and Otherwise
Re: Question cold neutron spin tracking (Emil Frlez)
Re: Question Re: cold neutron spin tracking (Emil Frlez)
Re: None Re: cold neutron spin tracking (Kosta Kliakhandler)
Re: Idea Re: cold neutron spin tracking (Gumplinger Peter)
Re: None Re: cold neutron spin tracking (Kosta Kliakhandler)
Date: 25 Jun, 2010
From: Gumplinger Peter <Gumplinger Peter>

Hi Kosta,

> In any case, if the anomaly in the G4Mag_SpinEqRhs class is the same as

> anomalous magnetic moment, why should it be set to 0?

"anomaly" in the code == anomalous magnetic moment

Sorry, for creating a bit of a confusion by suggesting to setting it to zero. Set it to what you use in your analytic calculation. You seem to know more what is the correct value to use for neutrons. Maybe, the acceptted numerical value has changed since Emil Frlez' postings in early 2006.

In any case, you must follow the description in Emil's summary posting (in this thread above) in order for you to spin track a neutral particle. I just noticed that John and I have not followed up on Emil's proposal to change the code in the Geant4 official source. I think we should since (ultra) cold neutrons are of great interest to the particle physics community. But my guess is you have done so already. The only thing that I allowed since Emil's proposal was to set the 'anomaly' in the equation so that class doesn't need to be modified by the user. Nevertheless, this is not a particular good choice because such property should rather go into the G4DynamicParticle (or G4ParticleDefinition) class.

Best regards, Peter

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