Abstract
The nearly isolated precise measurement of the vacuum contribution, Delbrück scattering, to the elastic scattering of photons off nuclei can be realized by using high-flux linearly-polarized gamma-ray sources. For the proof of principle experiment, an intense linearly polarized gamma-ray beam with an energy lower than 1 MeV should be provided. In order to examine the available gamma-ray performance at the UVSOR facility by colliding a CO2 laser with a 746-MeV electron beam, a preliminary experiment has been performed. As a result, it was confirmed that the maximum energy of the gamma-rays was slightly lower than 1 MeV and the measured gamma-ray flux was evaluated to be 6×10−4 photons/eV/mA/W/s around the peak energy of 950 keV. If we accept a 20 percent energy spread, in case of a 100-W CO2 laser colliding with a 300 mA electron beam, approximately 4×106-photons/s gamma-rays could be obtained. This flux is sufficiently high enough for the proof of principle experiment.
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