[en] Separated longitudinal and transverse structure functions for the reaction 1H(e,eprime pi+)n were measured in the momentum transfer region Q2=0.6-1.6 (GeV/c)**2 at a value of the invariant mass W=1.95 GeV. New values for the pion charge form factor were extracted from the longitudinal cross section by using a recently developed Regge model. The results indicate that the pion form factor in this region is larger than previously assumed and is consistent with a monopole parameterization fitted to very low Q2 elastic data

[en] We present measurements of the recoil proton polarization for the ¹H(gamma-vector,p-vector)pi⁰ reaction for theta_c.m.^pi = 60^o-135^o and for photon energies up to 4.1 GeV. These are the first data in this reaction for polarization transfer with circularly polarized photons. Various theoretical models are compared with the results. No evidence for hadron helicity conservation is observed. Models that employ factorization are not favored. It appears from the strong angular dependence of the induced polarization at photon energies of 2.5 and 3.1 GeV that a relatively high spin resonance or background amplitude might exist in this energy region

[en] We present the first precision measurement of the spin-dependent asymmetry in the threshold region of ³He(e,e(prime)) at Q²-values of 0.1 and 0.2 (GeV/c)². The agreement between the data and non-relativistic Faddeev calculations which include both final-state interactions (FSI) and meson-exchange currents (MEC) effects is very good at Q² = 0.1 (GeV/c)², while a small discrepancy at Q² = 0.2 (GeV/c)² is observed

[en] The ratio of the proton's elastic electromagnetic form factors, G_Ep/G_Mp was obtained by measuring P_t and P(ell), the transverse and the longitudinal recoil proton polarization, respectively. For elastic ep → ep, G_Ep/G_Mp is proportional to P_t/P(ell). Simultaneous measurement of P_t and P(ell) in a polarimeter provides good control of the systematic uncertainty. The results for the ratio G_Ep/G_Mp show a systematic decrease as Q² increases from 0.5 to 3.5 GeV², indicating for the first time a definite difference in the spatial distribution of charge and magnetization currents in the proton