DISTRIBUTION OF ISOTOPES PRODUCED IN GALLIUM-ARSENIDE AS A RESULT OF BOMBARDMENT BY HIGH-ENERGY PROTONS, DEUTERONS, AND HE-3 NUCLEI

The distribution of transmutation radioactive isotopes, produced in ga llium arsenide as a result of bombardment by 10-meV hydrogen nuclei (p rotons and deuterons) and 20-MeV He-3 nuclei, was investigated. The is otope concentration reaches values of 10(13)-10(14) cm(-3), and the de pth of the profile varies from similar to 100 mu m for He-3 nuclei up to similar to 400 mu m for protons. For this type of bombardment, the depth of the isotope profile correlates with the threshold of the reac tion which leads to the production of this isotope. The profiles of th e transmutation isotopes were used to determine the energy dependence of the cross section a for the nuclear reactions which produce these i sotopes. The results agree with the published data. (C) 1995 American Institute of Physics.