A polarized pure [Hvec][Dvec] target for nuclear physics experiments with real photons

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Abstract
The microscopic structure of baryon resonances provides a good test for models of the strong interaction. In fact, quark models are quite successful in describing the static properties like spins, parities, masses and magnetic moments. However, dynamical properties, as for example the photon coupling strengths corresponding to transitions from the ground states (proton and neutron) to the excited states (baryon resonances), are much more difficult to handle and provide an excellent test of the wave functions that quark models produce. For real photons, the coupling strength can be expressed by the total helicity amplitudes A1/2 and A3/2. It can be shown (1) that the complete determination of these amplitudes requires polarized photons, polarized targets and even a measurement of the recoil polarization. Therefore, modern real photon facilities should aim at having at least photons with both circular or linear polarizations and polarized targets (proton and neutron), with high and well-controlled polarization rates.

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