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The major effort in the high-energy nuclear chemistry program was the study of cross sections and kinematic properties of products formed from the interaction of 1- to 300-GeV protons with heavy- (Bi and U) and medium-mass (Cu, Ag) nuclei. The products studied ranged in mass from approximately 20 to that of the target nucleus. Except in the case of near-target product nuclei ($delta$A approximately 10 to 20), no substantial change in cross section or recoil properties was observed at 300 GeV from those measured at 11.5 GeV. New experiments are in progress to relate the production mechanisms of selected products to fundamental particle interactions and the production of exotic particles. Extensive preparations were made for another experiment to be performed soon at higher intensity on the search for polyneutron aggregates at the LAMPF Accelerator. Work is continuing on the use of stable isotope tracers (methane-20 and 21) for the study of long-range transport and diffusion phenomena in the atmosphere. A collaborative effort on the study of extraterrestrial objects (meteorites and lunar samples) is continuing. The work has involved correlations among trace and minor elements, the evolution of the lunar regolith, differentiation of lunar magmas, and a study of lunar agglutinates. (auth

Nuclear chemistry research. Progress report, November 1, 1974--October 31, 1975