9 research outputs found
Measurement of the Electric and Magnetic Polarizabilities of the Proton
The Compton scattering cross section on the proton has been measured at
laboratory angles of 90 and 135 using tagged photons in the
energy range 70--100 MeV and simultaneously using untagged photons in the range
100--148~MeV. With the aid of dispersion relations, these cross sections were
used to extract the electric and magnetic polarizabilities, and
respectively, of the proton. We find
in agreement with a model-independent dispersion sum rule, and
where the errors shown are statistical, systematic, and model-dependent,
respectively. A comparison with previous experiments is given and global values
for the polarizabilities are extracted.Comment: 35 pages, 11 PostScript figures, uses RevTex 3.
Coupled-channel description of the photodisintegration of 24Mg, 28Si, and 32S nuclei within the intermediate-coupling scheme
Scattering of photons by the proton through theta(cms)=90 degrees in the Delta-resonance region
The differential cross section for the scattering of photons by the proton was measured in the energy range E(gamma) = 250-500 MeV at the scattering angle theta(cms) = 90 degrees +/- 3 degrees. The tagged photon beam of the MAMI accelerator was used and both the scattered photon and the recoil proton were detected. The data essentially are consistent with dispersion theories, and remove the discrepancy that has existed above 290 MeV between theory and earlier published experimental results