User name V. Sulkosky
Log entry time 06:28:58 on October25,2007
Entry number 209542
keyword=Large number of Zero TracksAfter we changed to production kinematics (P0 = 1061.3 MeV/c, Theta =
60 degs.) from optics (P0 = 929 MeV/c, theta = 32.5 degs), we see
a lot of zero track events. Figure 1 shows the number of tracks from
the optics run (20121), and Figure 1 from 4He production.
I've checked the lead and carbon runs 20131 and 20132 respectively and
also see the majority of events have no track. The VDC spectra look
fine, so I suspect this is due to the kinematics at which we are
currently (elastic on Helium, lead, carbon and iron at 60 degrees).
FIGURE 1
FIGURE 2
