User name A. Deur
Log entry time 15:13:58 on July16,2003
Entry number 104063
This entry is a followup to: 104019
keyword=A reason why we do not see the 3rd foil
The C12 cross section drops a lot from large angles to small angles, that, in addition to the acceptance cut (see entry # 104019) may explain why we don't see the 3rd foil.
In my plot in entry # 104019, there were no weight due to cross section variation, it is just acceptance.
Here some values for the C12 elastic cross section.
Incident energy in GeV : 2.1
angle in degree: 4.5
Xsection in microbarn: 4355.8501
Incident energy in GeV 2.1
angle in degree 7.5
Xsection in microbarn: 30.333828
Enter Incident energy in GeV 2.1
enter angle in degree 6
Xsection in microbarn: 420.481781