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Direct measurement of the formation length of photons
We report the first observation of a shoulder in the radiation spectrum from GeV electrons in a structured target consisting of two thin and closely spaced foils. The position of the shoulder depends on the target spacing and is directly connected to the finite formation length of a low-energy photo...
| Autores principales: | , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2012
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevLett.108.071802 http://cds.cern.ch/record/1495636 |