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User name K. Aniol
Log entry time 21:38:44 on December 16,1999
Entry number 31235
keyword=revised elastic normalization point
Revised elastic cross section normalization points. The point we measured at Q2=10.08( runs 1365 and 1366) has a rate 15 times smaller than estimated. This is perhaps due to the uncertainty in the form factor at the minimum, although in Amroun's paper the minimum should not come until 12 /fm2. I recommend making the elastic measurement at the 2nd maximum, Q2 = 15.00 /fm2. The estimates for the rates for density = 0.056 g/cm3, 6.7msr, z_tgt=5.8cm, an 85% reduction at 70uA, are:
E Q2(/fm2) th_e p_e (fm2/sr) rate@ 70uA run time
842 15.00 57.94 738.59 1.77e-9 3/s 2 hrs
842 19.39 68.45 708.15 3.13e-10 0.5/s 7 hrs
4045 19.39 12.54 3911.16 2.05e-8 33/s 0.5 hrs
2903 15.00 15.41 2799.5 4.48e-8 72/s 0.5 hrs