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
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.