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The ATIC balloon-borne experiment measures the energy spectra of elementsfrom H to Fe in primary cosmic rays from about 100 GeV to 100 TeV. ATIC iscomprised of a fully active bismuth germanate calorimeter, a carbon target withembedded scintillator hodoscopes, and a silicon matrix that is used as the maincharge detector. The silicon matrix produces good charge resolution for protonsand helium but only partial resolution for heavier nuclei. In the presentpaper, the charge resolution of ATIC was improved and backgrounds were reducedin the region from Be to Si by using the upper layer of the scintillatorhodoscope as an additional charge detector. The flux ratios of nuclei B/C, C/O,N/O in the energy region from about 10 GeV/nucleon to 300 GeV/nucleon obtainedfrom this high-resolution, high-quality charge spectra are presented, andcompared with existing theoretical predictions.

Relative abundances of cosmic ray nuclei B-C-N-O in the energy region from 10 GeV/n to 300 GeV/n. Results from ATIC-2 (the science flight of ATIC)