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New calculations and measurements of the Coulomb cross-section for the production of direct electron pairs by high energy nucleiRecently, new calculations were made of the direct Coulomb pair cross section that rely less in arbitrary parameters. More accurate calculations of the cross section down to low pair energies were made. New measurements of the total direct electron pair yield, and the energy and angular distribution of the electron pairs in emulsion were made for O-16 at 60 and 200 GeV/amu at S-32 at 200 GeV/amu which give satisfactory agreement with the new calculations. These calculations and measurements are presented along with previous accelerator measurements made of this effect during the last 40 years. The microscope scanning criteria used to identify the direct electron pairs is described. Prospects for application of the pair method to cosmic ray energy measurements in the region 10 (exp 13) to 10 (exp 15) eV/amu are discussed.
Document ID
19900013055
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Derrickson, J. H. (NASA Marshall Space Flight Center Huntsville, AL., United States)
Dake, S. (Kobe Univ. (Japan). Huntsville., United States)
Dong, B. L. (Alabama Univ. Huntsville, AL., United States)
Eby, P. B. (NASA Marshall Space Flight Center Huntsville, AL., United States)
Fountain, W. F. (NASA Marshall Space Flight Center Matsumoto (Japan)., United States)
Fuki, M. (Matsusho Gakuen Junior Coll. Huntsville., United States)
Gregory, J. C. (Alabama Univ. Huntsville., United States)
Hayashi, T. (Alabama Univ. Knoxville., United States)
Iyono, A. (Kobe Univ. (Japan).)
King, D. T. (Tennessee Univ.)
Date Acquired
September 6, 2013
Publication Date
January 1, 1989
Subject Category
Atomic And Molecular Physics
Report/Patent Number
NASA-TM-101280
NAS 1.15:101280
Accession Number
90N22371
Funding Number(s)
CONTRACT_GRANT: NAGW-1231
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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