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20 April 2024

» arxiv » nucl-ex/0112015

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Backward spin polarizability $gamma_pi$ 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 ;
Date:	28 Dec 2001
Journal:	Phys.Rev. C65 (2002) 032202
Subject:	nucl-ex hep-ex hep-ph
Abstract:	Using the Mainz $48 cm {O} imes 64 cm$ NaI(Tl) detector and the segmented Göttingen recoil detector SENECA in coincidence, Compton scattering by the proton at $ heta^{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 $-27.2 pm 3.1$ $( imes 10^{-4}fm^4)$, respectively.
Source:	arXiv, nucl-ex/0112015
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