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Author Anthony, P. L. ♦ Becker-Szendy, R. ♦ Bosted, P. E. ♦ Cavalli-Sforza, M. ♦ Keller, L. P. ♦ Kelley, L. A. ♦ Klein, S. R. ♦ Niemi, G. ♦ Perl, M. L. ♦ Rochester, L. S. ♦ White, J. L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ PARTICLES ♦ BREMSSTRAHLUNG ♦ MIGDAL THEORY ♦ RELATIVISTIC RANGE ♦ CROSS SECTIONS ♦ PHOTONS ♦ ELECTRON REACTIONS ♦ GOLD 197 TARGET ♦ CARBON 12 TARGET
Abstract In the 1950s, Landau, Pomeranchuk, and Migdal (LPM) predicted that the cross section for bremsstrahlung from highly relativistic particles in dense media would be suppressed due to interference between amplitudes of nearby interactions. We have measured the production rates of 5 to 500 MeV photons from 8 and 25 GeV electrons traversing thin gold and carbon targets. We observe, to within 5% accuracy, suppression at the level predicted by Migdal. For extremely thin targets, we observe ``edge effects`` where the LPM suppression is reduced near the edges of the targets. We also point out the imprecise foundation of the LPM theory.
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-09-04
Publisher Department Stanford Linear Accelerator Center
Publisher Place United States
Journal Physical Review Letters
Volume Number 75
Issue Number 10
Organization Stanford Linear Accelerator Center


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