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CR-39 used for cosmic ray measurements aboard Spacelab-1

Authors
Journal
International Journal of Radiation Applications and Instrumentation Part D Nuclear Tracks and Radiation Measurements
1359-0189
Publisher
Elsevier
Publication Date
Volume
12
Identifiers
DOI: 10.1016/1359-0189(86)90623-0
Keywords
  • Cr-39
  • Spacelab-1
  • Cosmic Rays
  • “Magnetically Forbidden” Particles
Disciplines
  • Earth Science

Abstract

Abstract A stack of CR-39 plastic track detectors with a time resolution system was exposed to the cosmic radiation aboard Spacelab-1. The impact time of the incoming particles was determined with an accuracy of about 2 minutes. For each time interval which is correlated to an orbit interval a minimum cutoff rigidity exists. In the energy range 50 – 150 MeV/nuc 22 “geomagnetically forbidden” particles were found with a rigidity less than the required cutoff value assuming fully stripped ions. These particles hit the stack mainly in the southern hemisphere at local night time. The charge resolution of the used CR-39 is 0.37 charge units for single cone measurements.

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