Energy Spectra and Elemental Composition of Nuclei above 100 TeV from a Series of JACEE Balloon Flights

The Japanese-American Cooperative Emulsion Experiment (JACEE) has recently carried out a series of Antarctic circumpolar balloon flights (JACEE-10 ~ JACEE-13) for the study of high energy elemental composition and energy spectra of cosmic rays. The total exposure factor of these experiments is 663 m**2-hr, which is about twice the cumulative exposure from JACEE-1 through JACEE-8. Preliminary results from the Antarctic flights have been included in the cumulative JACEE spectrum.