Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-06-11
Physics
High Energy Physics
High Energy Physics - Experiment
10 pages, 13 figures, 1 table, REVTeX4 two column, Version for publication
Scientific paper
The cross section for coherent pair production by linearly polarised photons in the 20-170 GeV energy range was measured for photon aligned incidence on ultra-high quality diamond and germanium crystals. The theoretical description of coherent bremsstrahlung and coherent pair production phenomena is an area of active theoretical debate and development. However, under our experimental conditions, the theory predicted the combined cross section and polarisation experimental observables very well indeed. In macroscopic terms, our experiment measured a birefringence effect in pair production in a crystal. This study of this effect also constituted a measurement of the energy dependent linear polarisation of photons produced by coherent bremsstrahlung in aligned crystals. New technologies for manipulating high energy photon beams can be realised based on an improved understanding of QED phenomena at these energies. In particular, this experiment demonstrates an efficient new polarimetry technique. The pair production measurements were done using two independent methods simultaneously. The more complex method using a magnet spectrometer showed that the simpler method using a multiplicity detector was also viable.
Apyan Armen
Avakian R. O.
Badelek Barbara
Ballestrero S.
Biino Cristina
No associations
LandOfFree
Coherent Pair Production by Photons in the 20-170 GeV Energy Range Incident on Crystals and Birefringence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Coherent Pair Production by Photons in the 20-170 GeV Energy Range Incident on Crystals and Birefringence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coherent Pair Production by Photons in the 20-170 GeV Energy Range Incident on Crystals and Birefringence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-408182