Angular distribution

atolosad · November 18, 2022, 3:43pm

Hi,

have you tried with something like what they have here?

hyperk/Geant4/blob/main/source/4.10.01.p02/examples/advanced/gammaknife/GPS.in

# We have two energies and for these we set up two mono-energetic sources.
# Unluckily we have to set all the parameters for each source separately.
#
# /gps/verbose 2
/gps/source/intensity 1
/gps/ene/type Mono
/gps/ene/mono 1.33 MeV
/gps/particle gamma
/gps/pos/type Volume
/gps/pos/shape Cylinder
/gps/pos/centre 0.0 0.0 -40.1 cm
/gps/pos/radius 0.5 mm
/gps/pos/halfz 10.0 mm
/gps/ang/type iso
/gps/ang/mintheta 177 deg
/gps/ang/maxtheta 180 deg

/gps/source/add 1
# /gps/verbose 2
/gps/ene/type Mono

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Please, check also this recent thread

I hope it helps,

Alvaro.