Double polarization experiments at intermediate energy

Details Double polarization experiments at intermediate energy Double polarization experiments at intermediate energy

1999-09-14

arxiv.org/abs/nucl-ex/9909006v1

Nucl.Phys.A663:21-28,2000

Physics

Nuclear Physics

Nuclear Experiment

8 pages, 6 figures, plenary talk given at PANIC'99

Scientific paper

10.1016/S0375-9474(99)00568-0

At modern electron accelerators with highly polarized, intense, high duty factor beams double polarization coincidence experiments became feasible with good statistical accuracy. The strong potential towards the precise determination of small nucleon structure quantities is illustrated by two recent examples from MAMI. The measurement of $G_E^n$ in the quasifree reaction $D(\vec e, e'\vec n)p$ lead to a new parametrization of $G_E^n$ which is significantly above the previously preferred one from elastic $e-D$ scattering. A $p(\vec e, e'\vec p)\pi^0$ experiment at the energy of the $\Delta$ resonance yields preliminary results for the longitudinal quadrupole mixing. Both experimental errors and model uncertainties are complementary to unpolarized measurements.

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