Both theoretical calculations using the spectroscopic factor obtained in the parallel and constant (ω, q) kinematics. overestimate the experimental cross section, about factors 2 or 1.4, respectively. The (e, e\u27p) experiment at the low momentum transfer in ^C, ^O and ^Ca show some important contributions is missing in the theoretical approach. The authors would like to thank C. Giusti and A. Meucci for their relativistic calculations. They also thank the accelerator group, the computer group and Mr. Matsuda for their assistance to the experiment. This work has been supported by Grant-in-Aid for Scientific Research (KAKENHI) (No.14540239, No.17540229) from Japan Society for the Promotion of Science (JSPS)
