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Dear Catherine,
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<div class="">Without some more information about what you are trying to do, it is difficult for someone to provide recommendations about suitable physics options.</div>
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<div class="">You may have more luck in the Geant4 User Forums on “Physics Lists"</div>
<div class=""> <a href="http://hypernews.slac.stanford.edu/HyperNews/geant4/get/phys-list.html" class="">http://hypernews.slac.stanford.edu/HyperNews/geant4/get/phys-list.html</a></div>
<div class="">or maybe other related topics </div>
<div class=""> <a href="http://hypernews.slac.stanford.edu/HyperNews/geant4/cindex" class="">http://hypernews.slac.stanford.edu/HyperNews/geant4/cindex</a></div>
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<div class="">e.g. from the one on electromagnetic physics, about two years ago ( 9 Feb 2017 ) entitled “Re: which model for ~1 MeV alpha particles in gas “, there was an answer at
<a href="http://hypernews.slac.stanford.edu/HyperNews/geant4/get/emprocess/1457/1.html" class="">
http://hypernews.slac.stanford.edu/HyperNews/geant4/get/emprocess/1457/1.html</a></div>
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<div class="">Best regards,</div>
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<div class="">John</div>
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<div class="">===================================================</div>
<div class="">John Apostolakis, EP Department, CERN</div>
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<div class="">On 2 Feb 2019, at 00:54, Catherine Costa Oliveira da Silva <<a href="mailto:catherinecos@gmail.com" class="">catherinecos@gmail.com</a>> wrote:</div>
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<div class="">Hi everyone,</div>
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<div class="">I've been running a simulation with an alpha particle, but the simulation runs very slowly. Is there any way to speed up the simulation by changing the PhysicsList. I use the following physics process and source:</div>
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<div class="">/gate/physics/addPhysicsList emstandard<br class="">
/gate/physics/addProcess RadioactiveDecay<br class="">
/gate/physics/addAtomDeexcitation <br class="">
/gate/physics/processList Enabled<br class="">
/gate/physics/processList Initialized<br class="">
/gate/run/initialize<br class="">
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<div class="">/gate/source/sourceRa/gps/particle ion<br class="">
/gate/source/sourceRa/gps/ion 88 223 0 0<br class="">
/gate/source/sourceRa/setForcedUnstableFlag true<br class="">
/gate/source/sourceRa/useDefaultHalfLife<br class="">
/gate/source/sourceRa/gps/monoenergy 0. keV <br class="">
/gate/source/sourceRa/gps/angtype iso<br class="">
/gate/source/sourceRa/gps/confine NULL <br class="">
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<div class="">Best Regards</div>
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<div class="">Catherine Costa <br class="">
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