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    User name Olivier

    Log entry time 16:41:44 on March 23, 2005

    Entry number 142259

    Followups:

    keyword=S/N improvement for deuterium x>1

    I created a new physics module for triple coincidence (e,e'pn) that uses SK as secondary kinematics and NA as neutron arm. What it does is calculate the opposite of the struck proton initial momentum (p_RHRS - q), and compare it with the direction of all the NA tracks. It then selects the one that has the smallest angle between the 2 vectors. A cut can further be put on this angle to select the triple coincidence.

    It works really well on deuterium x>1: see figure. The red histogram is the TOF from the NA.tr.tof, similar to what we have done so far. The blue one is the TOF of the track selected by the new physics module. The S/N ratio has been dramatically improved.

    For use of this new module, see next entry.




    Figure 1

    comp1.ps