[gate-users] Vacuum is not empty

[Sebastien JAN]

Hi-again Jazmin,

> Dear Seb:
>
> Thanks for your response...I actually had done both of the things you 
> suggest...but I still get e+ scattering and annihilation within the 
> area that is supposedly under vacuum ..... any ideas ???  I expect 
> that the e+ should travel in a straight line path while it is in 
> vacuum !!!


That's right if you have a perfect vacuum ! And of course, we don't have 
a perfect vacuum ;)

With our definition in the GateMaterials.db, the density of vacuum is 
0.000001 mg/cm3 and not 0 mg/cm3. This is why you have some e+ interactions.

cheers
seb