The relative abundances of the isotopes of Lithium,Beryllium and Boron in the primary cosmic radiation

Studies have been made to determine the relative abundances of the isotopes of Lithium, Beryllium and Boron in the primary cosmic rays in the low energy interval 180–400 MeV per nucleon recorded in the emulsion stack flown from Fort Churchill. Two independent measurements of mass, wherever possible, were made on each track. Out of nine Boron tracks, 6 particle tracks are consistent with B¹¹ and 3 with B¹⁰. Amongst 2 Li tracks, one is consistent with Li⁶ and the other with Li⁷.