On the macroscopic formation length for GeV photons

H.D. Thomsen, T.J. Ketel

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Abstract

Experimental results for the radiative energy loss of 206 and 234 GeV electrons in 5-10 μm thin Ta targets are presented. An increase in radiation emission probability at low photon energies compared to a 100 μm thick target is observed. This increase is due to the formation length of the GeV photons exceeding the thickness of the thin foils, the so-called Ternovskii-Shul'ga-Fomin (TSF) effect. The formation length of GeV photons from a multi-hundred GeV projectile is through the TSF effect shown directly to be a factor 10
Original languageEnglish
Pages (from-to)323-327
JournalPhysics Letters B
Volume672
Issue number4-5
DOIs
Publication statusPublished - 2009

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On the macroscopic formation length for GeV photons

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