Analysis of exchange terms in a projected ERPA Theory applied to the   quasi-elastic (e,e') reaction
  A systematic study of the influence of exchange terms in the longitudinal and transverse nuclear response to quasi-elastic (e,e') reactions is presented. The study is performed within the framework of the extended random phase approximation (ERPA), which in conjuction with a projection method permits a separation of various contributions tied to different physical processes. The calculations are performed in nuclear matter up to second order in the residual interaction for which we take a (pi+rho)-model with the addition of the Landau-Migdal g'-parameter. Exchange terms are found to be important only for the RPA-type contributions around the quasielastic peak. 
E. Bauer (1), A. Polls (2), A. Ramos (2) ((1) Univ. Nacional de La   Plata, (2) Univ. de Barcelona)