Very Heavy Nuclei in the Primary Cosmic Radiation. I. Observations on the Energy Spectrum

Details Very Heavy Nuclei in the Primary Cosmic Radiation. I. Observations on the Energy Spectrum Very Heavy Nuclei in the Primary Cosmic Radiation. I. Observations on the Energy Spectrum

Nov 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968phrv..175.1641f&link_type=abstract

Physical Review, vol. 175, Issue 5, pp. 1641-1648

Physics

10

Scientific paper

The intensities and energy spectrum of the medium- and very heavy, MH and VH, nuclei, 16<=Z<=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 (Canada), Texas, and India. Integral intensities of Z>=20 nuclei above energies of 0.225, 1.58, and 7.1 BeV per nucleon were, respectively, 1.50+/-0.06, 0.403+/-0.023, and 0.090+/-0.006 (VH nuclei)/m2sr sec. The energy spectrum of these nuclei was measured in detail between 225 MeV per nucleon and 1 BeV per nucleon, and was found to exhibit a maximum in the 300- to 400-MeV per nucleon range, where the differential intensity was of the order of 1.7×10-3 nuclei/m2 sr sec (MeV per nucleon). Integral intensities of 16<=Z<=19 nuclei above energies of 1.58 and 7.1 BeV per nucleon were, respectively, 0.086+/-0.010 and 0.020+/-0.003 nuclei/m2 sr sec; differential intensities were also measured at lower energies.

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