Title

Observation of trans-iron nuclei in the primary cosmic radiation

Document Type

Article

Publication Date

12-1-1969

Abstract

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

First Page

338

Last Page

342

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