NDLI: Direct electron-pair production by high energy heavy charged particles

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Direct electron-pair production by high energy heavy charged particles

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hayashi, T. Gregory, J. C. Dong, B. L. Takahashi, Y.
Copyright Year	1989
Description	Direct electron pain production via virtual photons by moving charged particles is a unique electro-magnetic process having a substantial dependence on energy. Most electro-magnetic processes, including transition radiation, cease to be sensitive to the incident energy above 10 TeV/AMU. Thus, it is expected, that upon establishment of cross section and detection efficiency of this process, it may provide a new energy measuring technique above 10 TeV/AMU. Three accelerator exposures of emulsion chambers designed for measurements of direct electron-pains were performed. The objectives of the investigation were to provide the fundamental cross-section data in emulsion stacks to find the best-fit theoretical model, and to provide a calibration of measurements of direct electron-pairs in emulsion chamber configurations. This paper reports the design of the emulsion chambers, accelerator experiments, microscope measurements, and related considerations for future improvements of the measurements, and for possible applications to high energy cosmic ray experiments. Also discussed are the results from scanning 56m of emulsion tracks at 1200x magnification so that scanning efficiency is optimized. Measurements of the delta-ray range spectrum were also performed for much shorter track lengths, but with sufficiently large statistics in the number of measured delta-rays.
File Size	585329
Page Count	20
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890014771
Archival Resource Key	ark:/13960/t1mh2hm96
Language	English
Publisher Date	1989-05-01
Access Restriction	Open
Subject Keyword	Atomic And Molecular Physics Calibrating Heavy Nuclei Particle Energy Pair Production Radiation Counters High Energy Interactions Electron Emission Nuclear Emulsions Cosmic Rays Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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