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Keywords: hIoni direction variation
Forum: Hadronic Processes
Re: Question momentum direction changes during hIoni process (sauvestre)
Date: 21 May, 2007
From: michel maire <michel maire>

User sauvestre wrote:

>> During hIoni process, the momentum direction of the particle of concern
>> is seen to be changed. Where can i find explanations and/or equations of
>> motion involved that govern such a variation of the momentum direction?

 in PhysicsReferenceManual
 http://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/PhysicsReferenceManual/html/node52.html

 it is said :
 After the successful sampling of the energy, the direction of the 
 scattered electron is generated with respect to the direction of the 
 incident particle. The azimuthal angle  is generated isotropically. 
 The polar angle  is calculated from energy-momentum conservation. 
 This information is used to calculate the energy and momentum of both 
 scattered particles and to transform them into the global coordinate system.

 In addition, multiple scattering is applied at each step.

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