Several different groups have attempted, by various means, to explain the failure of the theory to describe the experimental data. One group [Ich89] extends the calculations of Alberico, et al. [AEM82] by adding distortions of the trajectory and spin orientation in the nuclear potential to the incident and ejected nucleon wave-functions. Another method [HoP93] [HiD94] used the plane wave approximation (no distortions) but incorporates relativistic effects by treating the nucleons as full Dirac particles. Yet another explanation [BrR91] [BrW94] comes from the possible rescaling of the meson mass inside the nuclear medium, which would mask the enhancement of the spin-longitudinal to spin-transverse ratio. Each of these explanations will be described in more detail in chapter . The attempt to gather further experimental data to evaluate these theories is the primary motivation behind the measurement of polarization observables in C presented in this thesis.
Even more recently Pandharipande et al. made a set of ``exact'' calculations of the spin responses of light nuclei (H, He, and He) using a variational Green's Function Monte Carlo technique [Pan94]. This method allowed the calculation of the spin responses without using the random phase approximation used in the original calculations by Alberico et al. [AEM82] and in the methods described in the preceding paragraph. The results of these calculations predict an enhancement, but it is pushed to higher energy loss than previously thought. This method will also be described in more detail in chapter . These calculations, using conventional nuclear potentials, predict a measurable enhancement even in H and significant enhancements in He and He. This is the primary motivation behind the measurement of the polarization observables in H reported on in this thesis.
Chapter will present the theoretical background for the various predictions made of the nuclear responses in quasifree scattering. Chapter will introduce the theoretical formalism in which the data for the current experiment will be presented and discussed. Chapter will detail the experimental apparatus used to make the measurements and Chapter will present the methods used for reducing the raw data to the desired polarization observables and nuclear responses. In Chapter the results of the experiments will be presented including a comparison of the data with theoretical models. Chapter will summarize the conclusions from the experiment.