Formation length effects in very thin targets

Journal Article · Thu Dec 01 00:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.112001· OSTI ID:20774415

Uggerhoej, U I; Knudsen, H ^[1]; Ballestrero, S; Sona, P ^[2]; Mangiarotti, A ^[3]; Ketel, T J ^[4]; Dizdar, A; Kartal, S ^[5]; Pagliarone, C ^[6]

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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)

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.

• OSTI ID: 20774415
• Journal Information: Physical Review. D, Particles Fields, Vol. 72, Issue 11; Other Information: DOI: 10.1103/PhysRevD.72.112001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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