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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2013, vol. 110, p. -

Backscattering of laser radiation on ultrarelativistic electrons in a transverse magnetic field: Evidence of MeV-scale photon interference

Abakumova E. V., Achasov M. N., Berkaev D. E., Kaminsky V. V., Muchnoi N. Yu, Perevedentsev E. A., Pyata E. E., Shatunov Yu M.

In this Letter we report an observation of interference effects in Compton scattering in the experiment held on the VEPP-2000 collider. Infrared laser radiation was scattered head-on the 990 MeV electrons inside the dipole magnet, where an electron orbit radius is about 140 cm. It was observed that the energy spectrum of backscattered photons, measured by a HPGe detector, differs from that defined by the Klein-Nishina cross section and scattering kinematics of free electrons. The explanation of the effect, proposed in terms of classical electrodynamics, is in agreement with QED calculations. © 2013 American Physical Society.