[BLAST_ANAWARE] question regarding daughter particles in GEANT

From: Aaron Joseph Maschinot (ajmasch@MIT.EDU)
Date: Tue Sep 21 2004 - 01:44:43 EDT


GEANT 3 experts, please help!!!

i need to know if there is an easy way (e.g. a flag or something) to make
GEANT consider energy lost by daughter particles to belong to the mother
particle.

perhaps this isn't clear. here's an example:

we have come to the belief that the reason GEANT doesn't register energy
loss for neutrons via the continuous-energy loss mechanism, ILOSS,
is because neutrons lose energy via elastically scattering off of a
proton. in the reaction n --> n + p, GEANT would consider the beginning
neutron and the final neutron to be different particles (since another
particle, a proton, was produced in the process). as such, the initial
particle didn't "lose" energy (at least not according to the ILOSS
mechanism); instead, an initial neutron became a final neutron of a
slightly lower energy.

anyway, this may be wrong; i don't pretend to be a GEANT expert. but,
assuming it's correct, it then implies that, if we want to get a nonzero
ADC value for a neutron passing through a neutron counter, we have to
find a way to associate the energies lost by the daughter particles (in
particular, the proton) that it becomes with the original neutron.

if you have any ideas, please offer them. i can't figure this out!!!

aaron



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