Backward spin polarizability <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>γ</mi></mrow><mrow><mi>π</mi></mrow></msub></mrow></math></span> 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. Jennewein; 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

doi:10.1103/PhysRevC.65.032202

Rapid Communication

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. Jennewein, 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, and F. Zapadtka

Phys. Rev. C 65, 032202(R) – Published 15 February 2002

Abstract

Using the Mainz $48 cm \emptyset \times 64 cm$ NaI(Tl) detector and the segmented Göttingen recoil detector SENECA in coincidence, Compton scattering by the proton at $θ_{γ}^{lab} = 136 °$ 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.

Received 23 November 2001

DOI:https://doi.org/10.1103/PhysRevC.65.032202

Authors & Affiliations

M. Camen¹, K. Kossert¹, F. Wissmann¹, J. Ahrens², H.-J. Arends², R. Beck², G. Caselotti², P. Grabmayr³, P. D. Harty⁴, O. Jahn², P. Jennewein², R. Kondratiev⁵, M. I. Levchuk⁶, V. Lisin⁵, A. I. L’vov⁷, J. C. McGeorge⁴, A. Natter³, V. Olmos de León², M. Schumacher^1,*, B. Seitz¹, F. Smend¹, A. Thomas², W. Weihofen¹, and F. Zapadtka¹

¹Zweites Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, Germany
²Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany
³Physikalisches Institut, Universität Tübingen, D-72076 Tübingen, Germany
⁴Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
⁵Institute for Nuclear Research, RU-117312 Moscow, Russia
⁶B. I. Stepanov Institute of Physics, Belarussian Academy of Sciences, 220072 Minsk, Belarus
⁷P. N. Lebedev Physical Institute, RU-117924 Moscow, Russia

^*Email address: mschuma3@gwdg.de

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Vol. 65, Iss. 3 — March 2002

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