This title appears in the Scientific Report :
2001
Low-energy compton scattering and the polarizabilities of the proton
Low-energy compton scattering and the polarizabilities of the proton
Differential cross-sections for Compton scattering from the proton hal e been measured at the MAMI tagged photon facility using the TAPS setup. The data cover an angular range of theta (lab)(gamma) = 59 degrees -155 degrees and photon energies ranging from 55 MeV to 165 MeV. Our results are in good...
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Personal Name(s): | Olmos de Leon, V. |
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Wissmann, F. / Achenbach, P. / Ahrens, J. / Arends, H. J. / Beck, R. / Harty, P. D. / Hejny, V. / Jennewein, P. / Kotulla, M. / Krusche, B. / Kuhr, V. / Leukel, R. / MacGeorge, J. C. / Metag, V. / Novotny, R. / Polonski, A. / Rambo, F. / Schmidt, A. / Schumacher, M. / Siodlaczek, U. / Ströher, H. / Thomas, A. / Weiß, J. / Wolf, M. | |
Contributing Institute: |
Institut 2 (Experimentelle Kernphysik II); IKP-2 |
Published in: | The @European physical journal / A, 10 (2001) S. 207 |
Imprint: |
Berlin
Springer
2001
|
Physical Description: |
207 |
Document Type: |
Journal Article |
Research Program: |
Mittelenergiephysik |
Series Title: |
European Physical Journal A
10 |
Subject (ZB): | |
Publikationsportal JuSER |
Differential cross-sections for Compton scattering from the proton hal e been measured at the MAMI tagged photon facility using the TAPS setup. The data cover an angular range of theta (lab)(gamma) = 59 degrees -155 degrees and photon energies ranging from 55 MeV to 165 MeV. Our results are in good agreement with those from previous experiments, but yield higher precision. Using dispersion relations the proton polarizabilities have been determined to be <(<alpha>)over bar> = [11.9 +/- 0.5(stat.) -/+ 1.3(syst.) +/- 0.3(mod.)] (.) 10(-4) fm(3) and <(<beta>)over bar> = [1.2 +/- 0.7(stat.) +/- 0.3(syst). +/- 0.4(mod.))] (.) 10(-4) fm(3). These results confirm the Baldin sum rule which was re-evaluated to be <(<alpha>)over bar> + <(<beta>)over bar> = [13.8 +/- 0.4] 10(-4) fm(3). We can also conclude that there is no significant additional asymptotic contribution to the backward spin polarizability gamma (pi) beyond the t-channel pi (0)-exchange. |