[mcstas-users] Neutron propagation medium

[Mahmoud Yaseen Suaifan]

Hello everyone,
Hope this email finds you all well.

I have simple question please: In McStas, what is the default propagation
medium of neutrons?
And if such concept is there, how can we handle it (for exsmple, changing
mediums like Vacuum, Air, or Helium ...etc ) to study effects or to get
more accurate outputs? Since i noticed from some results that the intensity
after few meters from aperture was reduced by some factor as if it is
propagating in Air (Air scattering is affecting the results ?? ), ( my
thought that the medium is vacuum). Shall i take into consideration some
correction factor to modify my data?
Any help regarding this issue is appreciated.

Thanks.
Mahmoud - South Korea
April 16th, 2018
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