THE VERY HEAVY NUCLEI IN THE PRIMARY COSMIC RADIATION. PART I. OBSERVATIONS ON THE ENERGY SPECTRUM.
MINNESOTA UNIV MINNEAPOLIS COSMIC RAY GROUP
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The intensities and energy spectrum of the medium and very heavy, MH- and VH-nuclei, 16 less than Z less than 30, present in the primary cosmic radiation have been studied using three stacks of nuclear emulsions exposed on high altitude balloons flown over Fort Churchill, Texas and India. Integral intensities of Z greater than 20 nuclei above energies of 0.225, 1.58 and 7.1 BeV per nucleon were respectively 1.50 plus or minus 0.06, 0.403 plus or minus 0.023 and 0.090 plus or minus 0.006 VH-nucleisq m ster.sec. In addition the shape of the energy spectrum of these nuclei was observed in detail for 0.225 less than T less than 1.0 BeV per nucleon. The intensities and energy spectra of those nuclei with 16 less than Z less than 19 were also studied although with less statistical accuracy. Among approximately 1600 VH-nuclei observed in this study there were none with Z greater than 32. Author
- Atmospheric Physics
- Nuclear Physics and Elementary Particle Physics