Heavy Primary Cosmic Rays at Geomagnetic Latitude of 41°N

Abstract

This report includes the results from 9 balloon flights at geomagnetic latitude 41\ifmmode^\circ\else\textdegree\fi{}N of altitude range from 70 000 to 100 000 feet. Only primaries of $Z>~10$ are considered. 2410 tracks are involved, in Ilford G-5 and G-0 emulsion exposures. Given are the charge spectra, flux, mean free paths, and angular distributions.