in the new monte carlo formalism, a text file named 'event.dgen' will be
generated which will include, among other things, the detectors that each
particle in the specified reaction hits. for acceptance studies, it
is necessary to link the hit detector information with the identity of
the particle hitting it (else we have to use the reconstruction to do
so, which contradicts the reason for this formalism). this sounds cut and
dry.
however, some confusion arises when particle-disintegration/transformation
physics processes (e.g. pair production and hadronic interactions) are
included. for example, in a LAD, it's possible that a neutron will
transform into a neutron and a gamma, into two neutrons and a gamma, into
a proton, an electron, and a gamma, etc.
my question is this: what should be recorded to event.dgen? currently, i
have it setup so that all detectors hit by one of the event-originating
particles (at the target) are recorded. however, as soon as a reaction
happens that causes GEANT to start a new track (e.g. GEANT would consider
the two neutrons in n --> n + gamma to be separate tracks and particles),
i stop recording.
so, what is the preferred way of recording here:
1) record hits until a GEANT-recognized particle disintegration/
transformation occurs
2) record all hits from all particles originating from any particular
event-origin particle (thus, e.g., in d + e --> e' + p + n followed
by n --> n + n + gamma, all detectors hit by either neutron or the
gamma would be recorded as being hit by the original neutron)
3) record all hits from "like" particles originating from any
particular event-origin particle (thus, e.g., in the example above in
2), only detectors hit by a neutron (either one), but not the gamma,
would be recorded as being hit by the original neutron)
4) else ???
aaron
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