The flux of primary cosmic ray nuclei of atomic number Z≥2 at geomagnetic latitude 30°

Abstract

The method of determining the primary flux of nuclei with atomic number Z ≥3 developed by Bradt and Peters, has been extended to include all nuclei of charge Z ≥2. It is shown that the method permits the identification of primary helium nuclei with an efficiency η ≥ 90%. The primary α-particle flux obtained in this way is in very good agreement with that obtained by other methods and the relative flux values for nuclei of atomic number 3 ≤ Z ≤ 5 and 6≤ Z≤ 9 agree with previous determinations.