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Title: Formation length effects in very thin targets

Abstract

Experimental results for the radiative energy loss of 178 GeV positrons in Cu, Au, and W targets are presented. It is shown that for a few micron thick target, effects related to the formation zone disappear, in particular, the suppression due to the Landau-Pomeranchuk-Migdal and Ternovskii-Shul'ga-Fomin mechanisms. This disappearance may restrict the region of applicability of thin foils as a target for energy-selective production of high energy photons. Furthermore, transition radiation dominated by multiple scattering and structured target interference effects are shown to be likely ingredients for an accurate description of the data obtained at low photon energies.

Authors:
;  [1]; ;  [2];  [3];  [4]; ;  [5];  [6]
  1. Department of Physics and Astronomy, University of Aarhus (Denmark)
  2. University of Florence, Florence (Italy)
  3. Physikalisches Institut, Heidelberg (Germany)
  4. Free University, Amsterdam (Netherlands)
  5. University of Istanbul, Istanbul (Turkey)
  6. University of Cassino, Italy and INFN Pisa (Italy)
Publication Date:
OSTI Identifier:
20774415
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 72; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevD.72.112001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COPPER 63 TARGET; ENERGY-LEVEL TRANSITIONS; FOILS; GEV RANGE; GOLD 197 TARGET; INTERFERENCE; LEPTON-NUCLEON INTERACTIONS; MULTIPLE SCATTERING; PHOTONS; POSITRON REACTIONS; POSITRONS; TRANSITION RADIATION; TUNGSTEN 182 TARGET; TUNGSTEN 184 TARGET; TUNGSTEN 186 TARGET

Citation Formats

Uggerhoej, U.I., Knudsen, H., Ballestrero, S., Sona, P., Mangiarotti, A., Ketel, T.J., Dizdar, A., Kartal, S., and Pagliarone, C.. Formation length effects in very thin targets. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.72.112001.
Uggerhoej, U.I., Knudsen, H., Ballestrero, S., Sona, P., Mangiarotti, A., Ketel, T.J., Dizdar, A., Kartal, S., & Pagliarone, C.. Formation length effects in very thin targets. United States. doi:10.1103/PhysRevD.72.112001.
Uggerhoej, U.I., Knudsen, H., Ballestrero, S., Sona, P., Mangiarotti, A., Ketel, T.J., Dizdar, A., Kartal, S., and Pagliarone, C.. Thu . "Formation length effects in very thin targets". United States. doi:10.1103/PhysRevD.72.112001.
@article{osti_20774415,
title = {Formation length effects in very thin targets},
author = {Uggerhoej, U.I. and Knudsen, H. and Ballestrero, S. and Sona, P. and Mangiarotti, A. and Ketel, T.J. and Dizdar, A. and Kartal, S. and Pagliarone, C.},
abstractNote = {Experimental results for the radiative energy loss of 178 GeV positrons in Cu, Au, and W targets are presented. It is shown that for a few micron thick target, effects related to the formation zone disappear, in particular, the suppression due to the Landau-Pomeranchuk-Migdal and Ternovskii-Shul'ga-Fomin mechanisms. This disappearance may restrict the region of applicability of thin foils as a target for energy-selective production of high energy photons. Furthermore, transition radiation dominated by multiple scattering and structured target interference effects are shown to be likely ingredients for an accurate description of the data obtained at low photon energies.},
doi = {10.1103/PhysRevD.72.112001},
journal = {Physical Review. D, Particles Fields},
number = 11,
volume = 72,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 2005},
month = {Thu Dec 01 00:00:00 EST 2005}
}