A Measurement of the Interference Structure Function, RLT, for the 12C(e,e'p) reaction in the Quasielastic Region
M. Holtrop, D. Jordan, T. McIlvain, R. Alarcon, R. Beck, W. Bertozzi, V. Bhushan, W. Boeglin, J. P. Chen, D. Dale, G. Dodson, S. Dolfini, K. Dow, J. Dzengeleski, M. B. Epstein, M. Farkhondeh, S. Gilad, J. Gorgen, K. Joo, J. Kelsey, W. Kim, R. Laszewski, R. Lourie, J. Mandeville, D. Margaziotis, D. Martinez, R. Miskimen, C. Papanicolas, S. Penn, W. Sapp, A. J. Sarty, D. Tieger, C. Tschalaer, W. Turchinetz, G. Warren, L. Weinstein, S. Williamson
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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