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    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