SPIN OBSERVABLES IN COINCIDENCE ELECTRON-SCATTERING FROM NUCLEI-I - REDUCED RESPONSE FUNCTIONS

A theoretical description of nucleon knockout reactions initiated by p olarized electron scattering from polarized nuclei is presented. Expli cit expressions for the complete set of reduced response functions (in dependent of the polarization angle) that can be experimentally obtain ed assuming plane waves for the electron are given in a general multip ole expansion. The formalism is applied to the particular case of clos ed-shell-minus-one nuclei using two models for the ejected nucleon. in cluding the final-state interaction phenomenologically with a complex optical potential and in the Factorized plane-wave impulse approximati on. Relativistic effects in the kinematics and in the electromagnetic current are incorporated throughout-specifically a new expansion of th e electromagnetic current in powers only of the struck nucleon momentu m is employed. Results are presented For the nucleus K-39. (C) 1998 Ac ademic Press.