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Backward spin polarizability $γ_π$ of the proton

M. Camen·K. Kossert·F. Wissmann·J. Ahrens·H. -J. Arends·R. Beck·G. Caselotti·P. Grabmayr·P. D. Harty·O. Jahn·P. Jennenwein·R. Kondratiev·M. I. Levchuk·V. Lisin·A. I. L'vov·J. C. McGeorge·A. Natter·V. Olmos de León·M. Schumacher·B. Seitz·F. Smend·A. Thomas·W. Weihofen·F. Zapadtka
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Abstract

Using the Mainz $48 cm Ø\times 64 cm$ NaI(Tl) detector and the segmented Göttingen recoil detector SENECA in coincidence, Compton scattering by the proton at $θ^{lab}_γ= 136^\circ$ 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 $γ_π= - 38.7 \pm 1.8$ and $-27.2 \pm 3.1$ $(\times 10^{-4}fm^4)$, respectively.

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M. Camen, K. Kossert, F. Wissmann, J. Ahrens, H. -J. Arends, R. Beck, G. Caselotti, P. Grabmayr, P. D. Harty, O. Jahn, P. Jennenwein, R. Kondratiev, M. I. Levchuk, V. Lisin, A. I. L'vov, J. C. McGeorge, A. Natter, V. Olmos de León, M. Schumacher, B. Seitz, F. Smend, A. Thomas, W. Weihofen, F. Zapadtka. 2001-12-28. Backward spin polarizability $γ_π$ of the proton. https://doi.org/10.1103/physrevc.65.032202

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