Quantum-mechanical suppression of bremsstrahlung
- Stanford Univ., CA (United States)
- American Univ., Washington, DC (United States)
- Univ. of California, Santa Cruz, CA (United States); and others
The authors have studied quantum-mechanical suppression of bremsstrahlung of low-energy 1-500 MeV photons from high-energy 25 GeV electrons. They have measured the LPM effect, where multiple scattering of the radiating electron destroys coherence required for the emission of low-energy photons, and the dielectric effect, where the emitted photon traveling in the radiator medium interferes with itself. For the experiment, the collaboration developed a novel method of extracting a parasitic low-intensity high-energy electron beam into the fixed target area during normal SLC operation of the accelerator. The results agree quantitatively with Migdal`s calculation of the LPM effect. Surface effects, for which there is no satisfactory theoretical prediction, are visible at low photon energies. For very thin targets, the suppression disappears, as expected. Preliminary results on dielectric suppression of bremsstrahlung are in qualitative agreement with the expectation.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- DOE Contract Number:
- AC03-76SF00515; W-7405-ENG-48
- OSTI ID:
- 90776
- Report Number(s):
- SLAC-444; CONF-930767-; ON: DE95008628; CNN: Grant NSF-PHY-9113428; Grant NSF-PHY-9114958; TRN: 95:018223
- Resource Relation:
- Conference: 21. annual SLAC Summer Institute on particle physics: spin structure in high-energy processes, Stanford, CA (United States), 26 Jul - 6 Aug 1993; Other Information: PBD: Dec 1994; Related Information: Is Part Of Spin structure in high energy processes: Proceedings; DePorcel, L.; Dunwoodie, C. [eds.]; PB: 593 p.
- Country of Publication:
- United States
- Language:
- English
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