Log entry time 18:59:25 on April 01, 2011

Entry number 354066

This entry is a followup to: 354044

With the help of Fatiha, I tried getting some PID in the R-HRS and failed.
The main problem is the new TDCs we have up there. 
With a 500ps resolutions and a 2ns time difference between protons and
neutrons there's not much to do on line.



What I was able to do is to use a vertex reconstruction cut.
Below are plots for the old and new kinematics. Same runs as halog 354044
were used.



Here are the number of events in the peak:
625MeV/c:
No vertex cut  : 1100
With vertex cut: 720

750MeV/c:
No vertex cut  : 610
With vertex cut: 410




I think that with better HRS optics offline this will be the best way to
kill randon coincedences in the HRSs.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6