Recoil proton polarization observables were measured for both the p( e,e ′ p ) and d( e,e ′ p )n reactions at two values of Q 2 using a newly commissioned proton Focal Plane Polarimeter at the M.I.T.-Bates Linear Accelerator Center. The hydrogen and deuterium spin-dependent observables D ℓℓ and D ℓt , the induced polarization P n and the form factor ratio G p E /G p M were measured under identical kinematics. The deuterium and hydrogen results are in good agreement with each other and with the plane-wave impulse approximation (PWIA).

No abstract

The first measurements of the induced proton polarization, Pn, for the 12 C(e, e ′ p) reaction are reported. The experiment was performed at quasifree kinematics for energy and momentum transfer (ω, q) ≈ (294 MeV, 756 MeV/c) and sampled a recoil momentum range of 0-250 MeV/c. The induced polarization arises from final-state interactions and for these kinematics is dominated by the real part of the spin-orbit optical potential. The distorted-wave impulse approximation provides good agreement with data for the 1p 3/2 shell. The data for the continuum suggest that both the 1s 1/2 shell and underlying ℓ > 1 configurations contribute.

Detailed angular distributions have been measured for Li elastic and inelastic scattering to the first 2 state in Li (projectile excitation) and the first 2+, 3, and 5 states in Ca at E( Li) =34MeV. Distorted-wave Born approximation and coupled-channels calculations of the inelastic processes were carried out with both Woods-Saxon and microscopic double-folded real optical potentials. No renormalization of the real double-folded potential is needed to fit the elastic data when the contribution from the ground state quadrupole moment of Li is accounted for in coupledchannels calculations, otherwise a renormalization of 0.6 is required. Moreover, these coupledchannels calculations matched the phase of the oscillations in the projectile excitation data, while calculations employing a Woods-Saxon real potential did not. The calculations for the excitation of states in Ca were insensitive to the form of real potential chosen.

No abstract