Measurement of the 1 Hð⃗; ⃗Þπ 0 Reaction Using a Novel Nucleon Spin Polarimeter

We report the first large-acceptance measurement of polarization transfer from a polarized photon beam to a recoiling nucleon. The measurement pioneers a novel polarimetry technique, which can be applied to many other nuclear and hadron physics experiments. The commissioning reaction of H1(γ→, p)π0 in the range 0.4nucleon.