Formation length effects in very thin targets

Details Formation length effects in very thin targets Formation length effects in very thin targets

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvd..72k2001u&link_type=abstract

Physical Review D, vol. 72, Issue 11, id. 112001

Physics

3

Radiation By Moving Charges, X- And Gamma-Ray Sources, Mirrors, Gratings, And Detectors, Calorimeters, Radiation Mechanisms, Polarization

Scientific paper

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.

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