Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-06-09
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages, 7 figures, REVTeX4 two column, Version for publication
Scientific paper
We present new results regarding the features of high energy photon emission by an electron beam of 178 GeV penetrating a 1.5 cm thick single Si crystal aligned at the Strings-Of-Strings (SOS) orientation. This concerns a special case of coherent bremsstrahlung where the electron interacts with the strong fields of successive atomic strings in a plane and for which the largest enhancement of the highest energy photons is expected. The polarization of the resulting photon beam was measured by the asymmetry of electron-positron pair production in an aligned diamond crystal analyzer. By the selection of a single pair the energy and the polarization of individual photons could be measured in an the environment of multiple photons produced in the radiator crystal. Photons in the high energy region show less than 20% linear polarization at the 90% confidence level.
Apyan Armen
Avakian R. O.
Badelek Barbara
Ballestrero S.
Biino Cristina
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