Backward spin polarizability $γ_π$ of the proton

Details Backward spin polarizability $γ_π$ of the proton Backward spin polarizability $γ_π$ of the proton

2001-12-28

arxiv.org/abs/nucl-ex/0112015v1

Phys.Rev. C65 (2002) 032202

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevC.65.032202

Using the Mainz $48 cm {\O}\times 64 cm$ NaI(Tl) detector and the segmented G\"ottingen recoil detector SENECA in coincidence, Compton scattering by the proton at $\theta^{lab}_\gamma = 136^\circ$ has been measured at MAMI (Mainz) in the energy range from 200 to 470 MeV. The new data confirm the previous observation that there is a systematic discrepancy between MAMI and LEGS (Brookhaven) data leading to different spin polarizabilities $\gamma_\pi = - 38.7 \pm 1.8$ and $-27.2 \pm 3.1$ $(\times 10^{-4}fm^4)$, respectively.

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