A Measurement of the Interference Structure Function, RLT, for the 12C(e,e'p) reaction in the Quasielastic Region
Abstract
The coincidence cross-section and the interference structure function, RLT, were measured for the 12C(e,e'p) 11B reaction at quasielastic kinematics and central momentum transfer of q=400 MeV/c. The measurement was at an opening angle of thetapq=11 degrees, covering a range in missing energy of Em = 0 to 65 MeV. The RLT structure function is found to be consistent with zero for Em > 50 MeV, confirming an earlier study which indicated that RL vanishes in this region. The integrated strengths of the p- and s-shell are compared with a Distorted Wave Impulse Approximation calculation. The s-shell strength and shape are compared with a Hartree Fock-Random Phase Approximation calculation. The DWIA calculation overestimates the cross sections for p- and s-shell proton knockout as expected, but surprisingly agrees with the extracted RLT value for both shells. The HF-RPA calculation describes the data more consistently, which may be due to the inclusion of 2-body currents in this calculation.
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