Measurement of the interference structure function RLT for the 12C(e,e′p) reaction in the quasielastic region

The coincidence cross section and the interference structure function, R-LT, were measured for the C-12(e,e'p) B-11 reaction at quasielastic kinematics and central momentum transfer of \(q) over right arrow\=400 MeV/c. The measurement was at an opening angle of theta(pq)= 11 degrees, covering a range in missing energy of E-m=0 to 65 MeV. The R-LT structure function is found to be consistent with zero for E-m>50 MeV, confirming an earlier study which indicated that R-L vanishes in this region. The integrated strengths of the p- and s-shell are compared with a distorted wave impulse approximation (DWIA) calculation. The s-shell strength and shape are also compared with a Hartree Fock-random phase approximation (HF-RPA) calculation. The DWIA calculation does not succeed in giving a consistent description of both the cross section data and the extracted R-LT response for either shell. The HF-RPA calculation describes the data more consistently, which may be due to the inclusion of 2-body currents in this calculation. [S0556-2813(98)01012-7].