engleski

"Measurement of the 1H(γ, p)π0 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, pioneering a novel polarimetry technique with wide application to future nuclear and hadronic physics experiments. The commissioning measurement of polarization transfer in the 1H(~γ, ~p)π0 reaction in the range 0.4< Eγ < 1.4 GeV is highly selective regarding the basic parametrization used in partial wave analyses to extract the nucleon excitation spectrum. The new data strongly favor the recently proposed Chew-Mandelstam formalism.

polarization transfer; polarized photon beam; MAMI

A2 Collaboration at MAMI.