31 March 2011 Meeting Summary

1.NaI detector check

2.Cross sections check with different Q3, theta and phi cuts

xinhu:

1. NaI Box 2 looks ok. Box 3 block 22( in the middle of box 3, for lower energy ), so cut it. But it's not for all runs(xinhu will upload the figure with good 22 block).
2. with Q3 cut, target and fp comparison becomes better. XS at central dp is good, at edge is bad with small Q3 cut. (-0.03<dp<0.03, bin size=0.01)
3. Since have 6 bins, the cross section at large omega(small Ep, dp) is higher, meaning acceptance is small. Because there is overlap for the adjacent runs, we can correct the acceptance at this small dp.