Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2000-11-21
Physics
Nuclear Physics
Nuclear Experiment
4 pages, no figures. Talk at the 9th Seminar "Electromagnetic Interactions of Nuclei at Low and Medium Energies", Moscow, 20-2
Scientific paper
An analysis of all experimental data of 50's - 90's on elastic gamma-p scattering at photon energies below 150 MeV (10 experimental works) is performed in order to determine the electric (alpha_p) and magnetic (beta_p) polarizabilities of the proton. A fit of these data with the two free parameters, alpha_p and beta_p, embedded into a theoretical cross section obtained on the basis of finite-energy s-channel dispersion relations gives the following world-average values of the proton polarizabilities (in units of 10^{-4} fm^3): alpha_p = 11.7 +- 0.8 (stat+sys) +- 0.7 (model), beta_p = 2.3 +- 0.9 (stat+sys) +- 0.7 (model), where the first error takes into account statistical and systematic errors of the experimental cross sections and the second error does model uncertainties in the theoretical cross section.
Baranov S. P.
L'vov A. I.
Petrun'kin V. A.
Shtarkov L. N.
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