[en] Hypernuclear physics is expected to play a large part in the TJNAF physics program. Several experiments in Halls A and C[1,2,4] have been approved to measure properties of bound hyperons. These experiments focus on measurements of the ΛN potential. The goal is to extract enough information to constrain the potential. The ΛN potential can be written as: V_#Lambda#_N = V(r) + V_N(r)s_N · 1_#Lambda#_N + V_#Lambda#(r)s_#Lambda# · 1_#Lambda#_N + V_σ(r)s_#Lambda# · s_N + V_T(r)S₁₂ where V(r) is the central part of the potential, V_N(r)s_N · 1_#Lambda#_N is the spin-orbit part of the nucleon-hyperon and V_#Lambda#(r)s_#Lambda# · 1_#Lambda#_N is the spin-orbit part of the hyperon-nucleon interactions, V_σ(r)s_#Lambda# · s_N is the spin-spin part of the potential and V_T(r)S₁₂ is the tensor part of the interaction

[en] Inclusive electron scattering data are presented for ²H and Fe targets at an incident electron energy of 4.045 GeV for a range of momentum transfers from Q² = 1 to 7 (GeV/c)². Data were taken at Jefferson Laboratory for low values of energy loss, corresponding to values of Bjorken x greater than or near 1. The structure functions do not show scaling in x in this range, where inelastic scattering is not expected to dominate the cross section. The data do show scaling, however, in the Nachtmann variable ξ. This scaling may be the result of Bloom Gilman duality in the nucleon structure function combined with the Fermi motion of the nucleons in the nucleus. The resulting extension of scaling to larger values of ξ opens up the possibility of accessing nuclear structure functions in the high-x region at lower values of Q² than previously believed

[en] The ⁴He(e,e'p)³H reaction has been measured at a missing momentum of 265 MeV/c. Data were taken to determine the R_L, R_T, and R_LT response functions. The extracted response functions show substantial differences from a microscopic calculation that includes the plane wave impulse approximation, final state interactions, and meson exchange currents, but agree much better with a calculation that includes orthogonality corrections, short range correlations, and final state interactions

[en] Tensor polarization observables (t20, t21 and t22) have been measured in elastic electron-deuteron scattering for six values of momentum transfer between 0.66 and 1.7 (GeV/c) 2. The experiment was performed at the Jefferson Laboratory in Hall C using the electron HMS Spectrometer, a specially designed deuteron magnetic channel and the recoil deuteron polarimeter POLDER. The new data determine to much larger Q 2 the deuteron charge form factors GC and GQ. They are in good agreement with relativistic calculations and disagree with pQCD predictions

[en] We have measured the coincidence d(rvec e,e'p) reaction in quasielastic scattering, detecting the proton in a noncoplanar geometry. The electron helicity asymmetry A_e and the imaginary part of the longitudinal-transverse interference structure function f_LT^' have been determined at a four-momentum transfer Q²=3.3 fm^-2. The results are compared with theoretical calculations which use realistic potentials for the NN interaction

[en] The A(Q²) structure function in elastic electron-deuteron scattering was measured at six momentum transfers Q² between 0.66 and 1.80 (GeV/c)² in Hall C at Jefferson Laboratory. The scattered electrons and recoil deuterons were detected in coincidence, at a fixed deuteron angle of 60.5^o. These new precise measurements resolve discrepancies between older sets of data. They put significant constraints on existing models of the deuteron electromagnetic structure, and on the strength of isoscalar meson exchange currents

[en] We have measured a new electron scattering observable, the ''fifth'' structure function, f₀₁^', which is the imaginary part of the transverse-longitudinal interference response. Its observation requires a longitudinally polarized beam and coincident, out-of-plane particle detection. f₀₁^' arises from interference between reaction channels and provides an additional means for their disentanglement. In the quasielastic ¹²C(rvec e,e',p) measurements reported here, f₀₁^' is driven by the interference of the direct knockout and rescattering amplitudes

[en] We investigated simultaneously the 12C(e,e'p) and 12C(e,e'pp) reactions at Q2 = 2 [GeV/c]2, x_B = 1.2, and in an (e,e'p) missing-momentum range from 300 to 600 MeV/c. At these kinematics, with a missing-momentum greater than the Fermi momentum of nucleons in a nucleus and far from the delta excitation, short-range nucleon-nucleon correlations are predicted to dominate the reaction. For (9.5 +/- 2)% of the 12C(e,e'p) events, a recoiling partner proton was observed back-to-back to the 12C(e,e'p) missing momentum vector, an experimental signature of correlations

[en] The RSS collaboration has measured the spin structure functions g₁ and g₂ of the proton at Jefferson Lab using the lab's polarized electron beam, the Hall C HMS spectrometer and the UVa polarized solid target. The asymmetries A_parallel and A_perp were measured at the elastic peak and in the region of the nucleon resonances (1.085 GeV < W < 1.910 GeV) at an average four momentum transfer of Q² = 1.3 GeV². The extracted spin structure functions and their kinematic dependence make a significant contribution in the study of higher-twist effects and polarized duality tests

[en] We have measured the ¹²C(γ^*,π^-p)¹¹C_g.s. cross section using virtual bremsstrahlung at three points at invariant masses of 1444 and 1530 MeV. At low neutron initial momentum (p_m∼60 MeV/c) and large N^* momentum (p_N^*∼750 MeV/c) the measured cross section is at or below the distorted wave impulse approximation (DWIA) calculation. At larger initial momentum (p_m∼220 MeV/c) and smaller N^* momentum (p_N^*∼500 MeV/c), the measured cross section is almost twice as large as the DWIA calculation. This discrepancy might be due to N^*-nucleus interactions