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Forum: Geometry
Re: Question define a relecting surface (Jincai)
Date: Feb 01, 09:13
From: Daren Sawkey <Daren Sawkey>

Hi,

I'm responding because this looks like an optics question. However it seems like you want to treat neutrons like optical photons. I'm not sure I understand your question but let me make two suggestions:

To determine neutron flux, use the standard scoring utilities like sensitive detectors and UserSteppingAction. See examples or documentation. I don't recommend trying to alter the physics.

If you really need to have neutrons reflect from a surface, please post in the hadronics forum. One of the experts there might have a suggestion.

-- Daren.

On Sun, 27 Jan 2019 13:23:20 GMT, Jincai wrote:

> Hi! I'm new to Geant4, so maybe my questions are a little stupid. I have
> been trying to simulate neutron transportation using Geant4, and my
> model consists of several tubes,whose origins are located in the same
> point.My neutron source is a tube too and all these tubes share the same
> center. In order to get the relationship between the neutron flux and
> the radius of different side surfaces of those tubes, I want to have
> those upper and lower surfaces of the tubes set as reflecting
> surfaces(i.e.,a particle track that hits a reflecting surface is
> reflected specularly.), but I haven't found out how to achieve this. Can
> anyone help me fix this? Thank you sincerely.
> 
> Jincai.
> 

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