Message: Cascade gammas from excited 12C Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

Question Cascade gammas from excited 12C 

Forum: Particles
Date: 22 May, 2009
From: Kareem Kazkaz <Kareem Kazkaz>

Hello everyone.

I am trying to create excited 12C nuclei as primary particles, so that I can get the subsequent cascade gammas. I am using GPS and the GRDM. Here are the commands I use:

		UI->ApplyCommand( "/gps/ion 6 12 0 4439" );
		UI->ApplyCommand( "/grdm/nucleusLimits 12 12 6 6" );

When I do this, I get the excited carbon nuclei, but no cascade gammas. In the SteppingAction, I print out the identity of the particles that are created, and then kill the track only if it's a beta or gamma. Here is the output:

	Created a 0-keV C12[4439.0]

If I set the energy state to 4440 keV, the 12C still does not relax to the ground state.

When I try to do the same with excited 137Ba, though (as though from the decay of 137Cs) using the commands

		UI->ApplyCommand( "/gps/ion 56 137 0 662" );
		UI->ApplyCommand( "/grdm/nucleusLimits 137 137 56 56" );

I get the output

	Created a 0-keV Ba137[662.0]
	Created a 661.998-keV gamma
	Created a 0-keV Ba137[0.0]

I get the 662 keV gammas out, and GEANT4 tracks the ground-state barium nucleus.

Does anybody have an idea of how to get the carbon nuclei to properly relax to the ground state?

Thanks for any and all help.

 Add Message Add Message
to: "Cascade gammas from excited 12C"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]