Observation of Cosmic-Ray Particles withand Interpretation of the Charge Spectrum
- 15 September 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 8 (6), 1722-1729
- https://doi.org/10.1103/physrevd.8.1722
Abstract
Large areas of plastic detectors and nuclear emulsions were exposed to the primary cosmic radiation on two high-altitude ballon flights in May 1968 and September 1969. From measurements on the tracks found in the scanning of the plastic detectors, events with charges were selected, and these data were consolidated with those from our earlier flights. Several conclusions can be drawn from the observed charge spectrum. The detection of trans-bismuth nuclei confirms earlier observations of these particles in the cosmic rays. However, no trans-uranium particles were observed. Detailed features of the charge spectrum cannot be explained by nuclei from -process nucleosynthesis alone. Although the addition of particles following -process abundances yields improved agreement, the spectrum appears more complicated than would result from a simple combination of - and -process abundances with identical propagation histories.
Keywords
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