Quasi-elastic proton knockout from {sup 16}O Page: 3 of 10
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allowed the use of vertex cuts to reject accidentals. The hydrogen in the H20
target greatly simplified the normalizations and calibrations. The luminosity
was monitored by continuously measuring H(e, e) and q was determined by
measuring H(e, ep) to an accuracy of 1.5 x 10--4.
The cross section was measured at fixed jq- 992 MeV/c at three beam
energies (corresponding to three virtual photon polarizations) to separate the
response functions and understand our systematic uncertainties. We took data
at the following kinematics: Eb,,m = 2.442 GeV, 0pq = , 2.50, 80, 16,
and 200; Eb,,m = 0.843 GeV, Opq = 00 +80 and +160; and Eb,,m = 1.643
GeV, Opq = 00, 80. The angles 00, 2.50, 80, 160, and 200 correspond to central
missing momenta of 53, 60, 148, 280, and 345 MeV/c, respectively. Note
that at Opq = 00, we had to remove the data at pm <45 MeV/c to eliminate
contamination from H(e, ep).
For Opq = 80, the values for RLT and ALT extracted at Eb,,m = 2.4 GeV
agree with those extracted at Eb,,m = 1.6 GeV within one standard deviation.
The overall systematic uncertainty in the extracted response functions is about
5%. This uncertainty is dominated by the uncertainty in the H(e, e) cross
section to which the data were normalized20
1.6
1.2
3a 0.4
0
10 20 30 40 50 60 70 80
Em [MeV]
Figure 1: Measured 160(, e'p) missing energy spectrum for Ebeam = 2.4 GeV at pm= 60
MeV/c.3
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Jager, K. de. Quasi-elastic proton knockout from {sup 16}O, article, September 1, 1999; Newport News, Virginia. (https://digital.library.unt.edu/ark:/67531/metadc712432/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.