The disintegration products of carbon and beryllium emerging from thin targets bombarded by an internal cyclotron beam of 330-Mev protons have been studied. The magnetic field of the cyclotron is employed for momentum analysis and nuclear track plates for detection and range analysis. On plotting radius of curvature versus range, various nuclear species are found to fall on identifiable loci. The relative abundances of the products and their momentum spectra are obtained. Hydrogen, helium, lithium, and boron products have been found and their abundances tabulated. Alpha-particles prove to be the most important charged particle product. Beryllium yields significantly more tritium than carbon. Some of the heavy products are found with very high momenta.

• Received 24 September 1952

DOI:https://doi.org/10.1103/PhysRev.89.1