XXXVII. Nuclear transmutations produced by cosmic-ray particles of great energy.—Part IV. The distribution in energy, and the secondary interactions of the particles emitted from stars

Abstract

The measurements of “multiple scattering” and “grain density” discussed in Parts II. and III. of the present series of papers, have now been extended to include a total of 1000 tracks of particles associated with “stars”. The method of measurement and the criteria for the selection of tracks were similar to those described previously (III.). The new material provides additional evidence in support of the view that most of the mesons ejected from nuclear explosions with kinetic energy less than 150 MeV. are π-particles.