Simultaneous Measurements Of(polarized Proton, Polarized Proton') and (polarized Proton, Polarized Proton' Gamma-Ray Observables for the 15.11 Mev, 1(+), T = 1 State in CARBON-12 at 200 Mev

Much information about the effective nucleon-nucleus interaction at intermediate energies has been obtained through measurements of (vec p,vec p ^') spin-transfer observables to discrete states, but more can be obtained by studying the polarization of the recoil nucleus. This can be achieved via measurements of the angular correlation between the scattered proton and the gamma -ray emitted in the nuclear de-excitation. The primary motivation for this work was to obtain as complete a data set as possible on one such nuclear transition, viz. the hadronic excitation of the 15.11 MeV, 1 ^+, T = 1 state in ^{12 }C at an incident proton energy of 200 MeV, through simultaneous measurements of (vec p,vec p ^') and (vec p,p^'gamma ) observables. To make these measurements we have developed a system of high energy spin-precession and polarimetry, a septum magnet system for the K600 spectrometer, and integrated a large photon detection system with the existing K600 and FPP system. Included in the (vec p,p ^'gamma) data are determinations of the sideways and longitudinal analyzing powers, D _{0S} and D_{0L }, which vanish in the (vec p vec p ^') reaction due to parity conservation, and are sensitive to phase information that is not accessible via (vec p,vec p ^') singles measurements. Due to the relatively simple spin sequence for this transition, i.e. 0^+ to 1^+, coupled with the large data set obtained, we have, in principle, enough information to completely determine the scattering amplitude in a model independent way.