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Phys. Rev. C 65, 032202(R) (2002) [3 pages]

Backward spin polarizability γπ of the proton

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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. Schumacher1,*, 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

Received 23 November 2001; published 15 February 2002

Using the Mainz 48cm∅×64cm NaI(Tl) detector and the segmented Göttingen recoil detector SENECA in coincidence, Compton scattering by the proton at θγlab=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 γπ=-38.7±1.8 and -27.2±3.1 (×10-4fm4), respectively.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.65.032202
DOI:
10.1103/PhysRevC.65.032202
PACS:
11.55.Fv, 13.60.Fz, 14.20.Dh, 25.20.Dc

*Email address: mschuma3@gwdg.de

 
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