CERN Accelerating science

Published Articles
Title	Landau-Pomeranchuk-Migdal Effect for High-Energy Electrons Observed with Emulsion Chambers
Author(s)	Yoshida, Kenji (Shibaura Inst. Tech.) ; Komori, Y (Kanagawa U.) ; Yanagisawa, K (Shibaura Inst. Tech.) ; Kobayashi, T (Aoyama Gakuin U.) ; Sato, Y (Utsunomiya U.) ; Nishimura, J (JAXA, Sagamihara)
Number of pages	4
In:	33rd International Cosmic Ray Conference, Rio de Janeiro, Brazil, 02 - 09 Jul 2013, pp.0733
Subject category	Detectors and Experimental Techniques ; Astrophysics and Astronomy
Accelerator/Facility, Experiment	CERN SPS CERN SPS
Test beam	H4
Abstract	We have performed high-energy electron observations using balloon-borne emulsion chambers, and derived the cosmic-ray electron spectrum in the energy range from 30 GeV to 3 TeV. For the calibration of the emulsion chambers, we have also carried out beam tests of 50 GeV, 200 GeV, and 250 GeV electrons at CERN-SPS. The Landau-Pomeranchuk-Migdal (LPM) effect predicts the reduction of amplitude for bremsstrahlung photon emission. It affects to the depth of the first electron-positron pair of the electron-induced shower, the so-called shower starting point. In the emulsion chambers, we can measure the shower starting points for high- energy electrons with the position resolution of 1 m m. From the observations of accelerator-beam electrons of 200 GeV and 250 GeV, and cosmic-ray electrons above 400 GeV, we found the direct evidence of suppression of the bremsstrahlung cross sections due to the LPM effect.

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