Cross sections and analyzing powers for quenched spin excitations in /sup 40,48/Ca at E/sub p/ = 334 MeV

The inelastic cross sections and analyzing powers for spin excitations in /sup 40,48/Ca have been measured at E/sub p/ = 334 MeV. The data for excited states in /sup 40/Ca at 8.424 MeV (2/sup -/) and 10.31 MeV (1/sup +/) and the 10.22-MeV (1/sup +/) state in /sup 48/Ca are fairly well described by microscopic distorted-wave impulse approximation calculations. Normalizations of the calculated cross sections to the experimental data show that these spin excitations are quenched. We deduce B(M2)up-arrow = 281 ..mu../sub N//sup 2/fm/sup 2/ for the 8.42-MeV 2/sup -/ state in /sup 40/Ca.