The separated isovector spin-longitudinal and spin-transverse responses from
a recent (p,n) quasifree experiment at 494 MeV are analyzed in a Glauber theory
framework up to two-step contributions. Nuclear correlations are treated in the
continuum random phase approximation, accounting for the spreading width of the
particle-hole states. A good description of the spin-longitudinal response is
achieved, hinting at some evidence of pionic effects in the quasielastic
region. The spin-transverse response is underestimated and we show that
multistep contributions, while sizable, are not sufficient to provide an
explanation of the discrepancy.Comment: 8 pages, uses REVTeX and epsfig, 2 postscript figures; a postscript
version of the paper is available by anonymous ftp at
ftp://toxd01.to.infn.it/pub/depace/papers/9502
