Observation of trans-iron nuclei in the primary cosmic radiation
Interleaved layers of nuclear photographic emulsion and plastic detectors, covering a total area of 21 m2, were exposed to the primary cosmic radiation on high-altitude balloon flights. Flux values, in particles/m2 sr sec, have been estimated to be J(Z>~33)>~2.6×10-5, J(33<~Z<~40)<~1. 9×10-5, J(Z>~70)1×10-6. These values refer to the top of the atmosphere, after extrapolation through 1.5 g/cm2 of detector and 3.5 g/cm2 of atmosphere, for particles with magnetic rigidities above 5 GeV. © 1969 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review Letters
Blanford, G., Friedlander, M., Klarmann, J., Walker, R., Wefel, J., Wells, W., Fleischer, R., Nichols, G., & Price, P. (1969). Observation of trans-iron nuclei in the primary cosmic radiation. Physical Review Letters, 23 (6), 338-342. https://doi.org/10.1103/PhysRevLett.23.338