title: Backscattering of laser radiation on ultrarelativistic electrons in a transverse magnetic field: evidence of MeV-scale photon interference.
abstract: 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.
authors.affiliation: Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences and Novosibirsk State University, 630090 Novosibirsk, Russia.
authors.forename: E V
authors.initials: EV
authors.lastname: Abakumova
authors.affiliation: Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences and Novosibirsk State University, 630090 Novosibirsk, Russia.
authors.forename: M N
authors.initials: MN
authors.lastname: Achasov
authors.affiliation: Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences and Novosibirsk State University, 630090 Novosibirsk, Russia.
authors.forename: D E
authors.initials: DE
authors.lastname: Berkaev
authors.affiliation: Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences and Novosibirsk State University, 630090 Novosibirsk, Russia.
authors.forename: V V
authors.initials: VV
authors.lastname: Kaminsky
authors.affiliation: Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences and Novosibirsk State University, 630090 Novosibirsk, Russia.
authors.forename: N Yu
authors.initials: NY
authors.lastname: Muchnoi
authors.affiliation: Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences and Novosibirsk State University, 630090 Novosibirsk, Russia.
authors.forename: E A
authors.initials: EA
authors.lastname: Perevedentsev
authors.affiliation: Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences and Novosibirsk State University, 630090 Novosibirsk, Russia.
authors.forename: E E
authors.initials: EE
authors.lastname: Pyata
authors.affiliation: Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences and Novosibirsk State University, 630090 Novosibirsk, Russia.
authors.forename: Yu M
authors.initials: YM
authors.lastname: Shatunov