Emulsion chambers are being used in a series of stratospheric balloon flights to study nuclear interactions, charge composition, and energy spectra of cosmic ray nuclei over the energy range 1012-1015 eV. Charge identification involves grain, gap, and/or delta-ray counting in emulsion plates having different sensitivities on two sides of an acrylic base. Electromagnetic cascade energies are measured with resolutions of about 25% by the three-dimensional track counting method. This report describes the apparatus, the measurement techniques, and the analysis methods used to determine the primary proton and helium spectra. © 1986.
Burnett, T. H., Dake, S., Fuki, M., Gregory, J. C., Hayashi, T., Holynski, R., … Wosiek, B. (1986). JACEE emulsion chambers for studying the energy spectra of high energy cosmic ray protons and helium. Nuclear Inst. and Methods in Physics Research, A, 251(3), 583–595. https://doi.org/10.1016/0168-9002(86)90655-8