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Kirsebom K, Mikkelsen U, Uggerhøj E, et al. First measurements of the unique influence of spin on the energy loss of ultrarelativistic electrons in strong electromagnetic fields. Phys Rev Lett. 2001;87(5):054801doi: 10.1103/PhysRevLett.87.054801.
Kirsebom, K., Mikkelsen, U., Uggerhøj, E., Elsener, K., Ballestrero, S., Sona, P., & Vilakazi, Z. Z. (2001). First measurements of the unique influence of spin on the energy loss of ultrarelativistic electrons in strong electromagnetic fields. Physical review letters, 87(5), 054801. https://doi.org/10.1103/PhysRevLett.87.054801
Kirsebom, K, et al. "First measurements of the unique influence of spin on the energy loss of ultrarelativistic electrons in strong electromagnetic fields." Physical review letters vol. 87,5 (2001): 054801. doi: https://doi.org/10.1103/PhysRevLett.87.054801
Kirsebom K, Mikkelsen U, Uggerhøj E, Elsener K, Ballestrero S, Sona P, Vilakazi ZZ. First measurements of the unique influence of spin on the energy loss of ultrarelativistic electrons in strong electromagnetic fields. Phys Rev Lett. 2001 Jul 30;87(5):054801. doi: 10.1103/PhysRevLett.87.054801. Epub 2001 Jul 17. PMID: 11497778.
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Phys Rev Lett. 2001 Jul 30;87(5):054801. doi: 10.1103/PhysRevLett.87.054801. Epub 2001 Jul 17.

First measurements of the unique influence of spin on the energy loss of ultrarelativistic electrons in strong electromagnetic fields.

Physical review letters

K Kirsebom, U Mikkelsen, E Uggerhøj, K Elsener, S Ballestrero, P Sona, Z Z Vilakazi

Affiliations

  1. Institute for Storage Ring Facilities, University of Aarhus, Aarhus, Denmark.

PMID: 11497778 DOI: 10.1103/PhysRevLett.87.054801

Abstract

Although some authors have claimed that the effect is not detectable, we show experimentally for the first time that as the quantum parameter chi grows beyond 1, an increasingly large part of the hard radiation emitted arises from the spin of the electron. Results for the energy loss of electrons in the energy range 35-243 GeV incident on a W single crystal are presented. Close to the axial direction the strong electromagnetic fields induce a radiative energy loss which is significantly enhanced compared to incidence on an amorphous target. In such continuously strong fields, the radiation process is highly nonperturbative for ultrarelativistic particles and a full quantum description is needed. The remarkable effect of spin flips and the energy loss is connected to the presence of a field comparable in magnitude to the Schwinger critical field, E0 = m(2)c(3)/ePlanck's over 2pi, in the rest frame of the emitting electron.

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