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Question Recording (n, gamma) reactions, and misc. newbie questions 

Forum: Particles
Date: 18 May, 2015
From: Karen Pease <Karen Pease>

Hi,

I'm a newbie to Geant4 here and have been messing around with it for two days or so. Unfortunately I'm getting a bit confused. My goal is to have neutron beam and, for each component in the setup, report the energy deposited and the number / type of (n, gamma) reactions. I've set up a scene based on the B1 example but I don't know which examples to look at that would be closest to what I need for analyzing transmutation. I assume that I have to do something with G4ParticleChange? Somehow? In some manner? Via grep I see G4ParticleChange used in some of the advanced examples but I don't understand them.

I see where I have a "SteppingAction" which gets the total energy deposit for the "step", although I'm not really positive on what a step is exactly (is it anything, anything at all, that happens?). I think that should let me categorize the energy on a per-object basis. But as for counting the (n, gamma) reactions and categorizing them by type and the properties of the newly generated isotopes, I really don't know where to start.

Can you point me in the right direction? Thanks :)

Also (hope it's not too much for one post!), there's a few other things that I want to be sure I'm understanding right:

 * When I call G4PVPlacement and add a child of a mother volume, when a particle moves into the child volume, it stops interacting with matter made out of the material of the mother and starts interacting with matter made out of the material of the child, right?

 * When I set in the macro file "/gps/time 1ms" and then "/run/beamOn 10000", is that 1ms per particle emitted or 1ms for the whole beam? And if it's for the whole beam, how do I specify the beam power or number of particles? And if it's creating radioactive particles will they decay while the beam is on, but then anything that's not yet decayed when the beam shuts off will not continue its decay processes, the simulation will just end? And there's no way to make it just keep going for X length of time if desired?

 * Is there any way to simulate the "long term" results of a scene - for example, rather than firing off 10000 particles at the target and stopping, having it extrapolate how the target will evolve after being exposed for, say, hours, days, years, or whatnot? (this isn't critical for me at the moment).

 - kv, Karen

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1 Feedback: Re: Recording (n, gamma) reactions, and misc. newbie questions   (Michael H. Kelsey - 18 May, 2015)
(_ Question: Re: Recording (n, gamma) reactions, and misc. newbie questions   (Karen Pease - 20 May, 2015)
(_ Feedback: Re: Recording (n, gamma) reactions, and misc. newbie questions   (Michael H. Kelsey - 20 May, 2015)
(_ None: Re: Recording (n, gamma) reactions, and misc. newbie questions   (Michael H. Kelsey - 21 May, 2015)
(_ Feedback: Re: Recording (n, gamma) reactions, and misc. newbie questions   (Michael H. Kelsey - 21 May, 2015)
(_ None: Re: Recording (n, gamma) reactions, and misc. newbie questions   (Karen Pease - 21 May, 2015)
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