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Title: An Accurate Measurement of the Landau-Pomeranchuk-Migdal Effect

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.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]
  1. Stanford Linear Accelerator Center, Stanford, California 94309 (United States)
Publication Date:
Research Org.:
Stanford Linear Accelerator Center
OSTI Identifier:
251123
DOE Contract Number:  
AC03-76SF00515; AC03-76SF00098; W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 75; Journal Issue: 10; Other Information: PBD: 4 Sep 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; PARTICLES; BREMSSTRAHLUNG; MIGDAL THEORY; RELATIVISTIC RANGE; CROSS SECTIONS; PHOTONS; ELECTRON REACTIONS; GOLD 197 TARGET; CARBON 12 TARGET

Citation Formats

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, The American University, Washington, D.C. 20016, Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California 95064, and Lawrence Berkeley Laboratory, Berkeley, California 94720. An Accurate Measurement of the Landau-Pomeranchuk-Migdal Effect. United States: N. p., 1995. Web. doi:10.1103/PhysRevLett.75.1949.
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, The American University, Washington, D.C. 20016, Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California 95064, & Lawrence Berkeley Laboratory, Berkeley, California 94720. An Accurate Measurement of the Landau-Pomeranchuk-Migdal Effect. United States. doi:10.1103/PhysRevLett.75.1949.
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, The American University, Washington, D.C. 20016, Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California 95064, and Lawrence Berkeley Laboratory, Berkeley, California 94720. Mon . "An Accurate Measurement of the Landau-Pomeranchuk-Migdal Effect". United States. doi:10.1103/PhysRevLett.75.1949.
@article{osti_251123,
title = {An Accurate Measurement of the Landau-Pomeranchuk-Migdal Effect},
author = {Anthony, P L and Becker-Szendy, R and Bosted, P E and Cavalli-Sforza, M and Keller, L P and Kelley, L A and Klein, S R and Niemi, G and Perl, M L and Rochester, L S and White, J L and The American University, Washington, D.C. 20016 and Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California 95064 and Lawrence Berkeley Laboratory, Berkeley, California 94720},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.75.1949},
journal = {Physical Review Letters},
number = 10,
volume = 75,
place = {United States},
year = {1995},
month = {9}
}