Meson and Isobar Degrees of Freedom in A($\vec{e},e^{\prime }\vec{p}$) reactions at $0.2\le Q^2\le 0.8(GeV/c{)}^2$

Abstract

The effect of meson and isobar degrees of freedom in A($\vec{e},e^{\prime }\vec{p}$) and A(e,e'n) is studied for four-momentum transfers Q^2 in the range between 0.2 and 0.8 (GeV/c)^2. The calculations are performed in a non-relativistic framework with explicit (N,Δ,π) degrees-of-freedom. For the whole range of momentum transfers under investigation the relative effect of the meson-exchange and isobar degrees of freedom is significant. At low missing momenta and quasi-elastic conditions, a tendency to reduce the (e,e'p) and (e,e'n) differential cross sections is noticed. The greatest sensitivity is found in the interference structure functions $W_{LT}$ and $W_{TT}$. The recoil polarization observables, on the other hand, are moderately affected by the meson-exchange and $\Delta$-isobar currents.

16 pages (Revtex) + 18 figures (eps file)

References in corpus (12)

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• In-medium electron-nucleon scattering
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• Electroinduced two-nucleon knockout and correlations in nuclei
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• Medium dependence of the bag constant in the quark-meson coupling model
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• Measurement of the Induced Proton Polarization P_n in the 12C(e,e'\vec{p}) Reaction
• Relativistic Effects in Electromagnetic Meson-Exchange Currents for One-Particle Emission Reactions
• Relativistic current densities for bound spin-orbit partners and the longitudinal-transverse response in (e,e'p) processes
• Damping mechanisms of the Delta resonance in nuclei
• Semi-relativistic charge-current density operator

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