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  Quantum radiation reaction in aligned crystals beyond the local constant field approximation

Wistisen, T. N., Di Piazza, A., Nielsen, C. F., Sørensen, A. H., & Uggerhøj, U. I. (2019). Quantum radiation reaction in aligned crystals beyond the local constant field approximation. Physical Review Research, 1(3): 033014. doi:10.1103/PhysRevResearch.1.033014.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-E4DB-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-E4E6-7
Genre: Journal Article

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Wistisen, T. N.1, 2, Author              
Di Piazza, A.1, Author              
Nielsen, C. F.2, Author
Sørensen, A. H.2, Author
Uggerhøj, U. I. 2, 3, Author
Affiliations:
1Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society, ou_904546              
2Department of Physics and Astronomy, Aarhus University, 8000 Aarhus, Denmark, ou_persistent22              
3CERN NA63, ou_persistent22              

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Free keywords: Physics, Plasma Physics, physics.plasm-ph,High Energy Physics - Experiment, hep-ex,High Energy Physics - Phenomenology, hep-ph
 MPINP: Research group A. Di Piazza – Division C. H. Keitel
 Abstract: We report on experimental spectra of photons radiated by 50 GeV positrons crossing silicon single crystals of thicknesses 1.1 mm, 2.0 mm, 4.2 mm, and 6.2 mm at sufficiently small angles to the (110) planes that their motion effectively is governed by the continuum crystal potential. The experiment covers a new regime of interaction where each positron emits several hard photons, whose recoil are not negligible and which are formed on lengths where the variation of the crystal field cannot be ignored. As a result neither the single-photon semiclassical theory of Baier et al. nor the conventional cascade approach to multiple hard photon emissions (quantum radiation reaction) based on the local constant field approximation are able to reproduce the experimental results. After developing a theoretical scheme which incorporates the essential physical features of the experiments, i.e., multiple emissions, photon recoil and background field variation within the radiation formation length, we show that it provides results in convincing agreement with the data.

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 Dates: 2019-10-09
 Publication Status: Published online
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 Identifiers: arXiv: 1906.09144
DOI: 10.1103/PhysRevResearch.1.033014
URI: http://arxiv.org/abs/1906.09144
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Title: Physical Review Research
Source Genre: Journal
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Publ. Info: College Park, Maryland, United States : American Physical Society (APS)
Pages: - Volume / Issue: 1 (3) Sequence Number: 033014 Start / End Page: - Identifier: ISSN: 2643-1564
CoNE: https://pure.mpg.de/cone/journals/resource/2643-1564