HIGH-MISSING-MOMENTUM COMPONENTS IN THE HE-4(E,E'P)H-3 REACTION

The cross section of the He-4(e, e'p)H-3 reaction has been measured fo r missing momenta 220 less than or equal to p(m) less than or equal to 690 MeV/c to study high-momentum components of the nuclear wave funct ion and the reaction mechanism for this transition. The zero predicted in the plane-wave impulse approximation (PWIA) cross section, due to the underlying pt momentum distribution, is found to be washed out. Th ree types of calculations indicate that this is caused by final-state interactions and contributions from two-body currents. The calculation s reproduce the high p(m) (600-690 MeV/c) data, although due to differ ent ingredients in the models.