Effect on the Mott cross section of the determination of the charge of ultraheavy cosmic rays from emulsion tracks
Energy deposition due to secondary electrons is calculated as a function of distance from the axis of the track of a heavy ion. The calculation incorporates the empirical formulas of Kobetich and Katz for delta-ray energy dissipation. Both the Mott and Born-approximation expressions for the delta-ray energy distributions are used and the results are compared. The energy deposition projected along a line perpendicular to the track is also calculated. These results are used to estimate the effect that the use of the Mott cross section would have in the interpretation of photometric measurements on emulsion tracks of trans-iron cosmic-ray particles. It is shown that the use of 50 keV as a characteristic track-formation electron energy to estimate the effect of the Mott cross section systematically overestimates charge as derived from emulsions in the Z > 20 range.
- Research Organization:
- Space Sciences Laboratory, Marshall Space Flight Center, Huntsville, Alabama 35812
- OSTI ID:
- 6468115
- Journal Information:
- Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 18:9; ISSN PRVDA
- Country of Publication:
- United States
- Language:
- English
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654001 -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BORN APPROXIMATION
CHARGE DENSITY
CHARGED PARTICLES
CHARGED-PARTICLE TRANSPORT THEORY
COSMIC NUCLEI
COSMIC RADIATION
CROSS SECTIONS
DELTA RAYS
DISTRIBUTION
ELASTIC SCATTERING
ELECTRONS
ELEMENTARY PARTICLES
EMISSION
ENERGY LOSSES
ENERGY SPECTRA
FERMIONS
HEAVY IONS
IONIZING RADIATIONS
IONS
LEPTONS
LOSSES
MOTT SCATTERING
NUCLEAR EMULSIONS
NUCLEI
PARTICLE IDENTIFICATION
PARTICLE TRACKS
RADIATIONS
SCATTERING
SECONDARY EMISSION
SPECTRA
TRANSPORT THEORY