SIMULTANEOUS MEASUREMENTS OF ((P)OVER-RIGHT-ARROW,(P)OVER-RIGHT-ARROW') AND ((P)OVER-RIGHT-ARROW,P'-GAMMA) OBSERVABLES FOR THE 15.11 MEV, 1(-12 AT 200 MEV(), T=1 STATE IN C)

We have made simultaneous measurements of singles ((p) over right arro w,(p) over right arrow') spin-transfer observables and coincident ((p) over right arrow,p' gamma) yields and asymmetries for the 15.11 MeV, 1(+), T=1 state in C-12, at an incident proton bombarding energy of 20 0 MeV. Data were taken at four proton scattering angles ranging from t heta(p)(c.m.)=5.5 degrees to 16.5 degrees. Both vertical (normal to th e reaction plane) and horizontal (in-plane) incident beam polarization s were used, which allowed us to extract 16 different observables for this transition. In particular, using the ((p) over right arrow,p' gam ma) reaction, we measured the sideways and longitudinal analyzing powe rs, D-OS and D-OL, which vanish identically in the ((p) over right arr ow,p') reaction. Detailed comparisons of all observables to calculatio ns done in both relativistic and nonrelativistic formalisms are presen ted. Surprisingly, a relativistic description in which knock-on exchan ge processes are not explicitly included provides the best overall agr eement with the data.