A new measurement of the flux of the light cosmic-ray nuclei at high energies

Details A new measurement of the flux of the light cosmic-ray nuclei at high energies A new measurement of the flux of the light cosmic-ray nuclei at high energies

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...429..736b&link_type=abstract

The Astrophysical Journal, vol. 429, no. 2, pt. 1, p. 736-747

Physics

Nuclear Physics

34

Abundance, Cerenkov Counters, Construction, Cosmic Rays, Energy Spectra, Experiment Design, Flux (Rate), Light Elements, Nuclei (Nuclear Physics), High Altitude Balloons, Hodoscopes, Imaging Techniques, Mirrors, Reflection, Ring Structures, Scintillation Counters, Spherical Caps

Scientific paper

A new cosmic-ray detector utilizing a ring-imaging Cerenkov counter to determine the energy of light cosmic-ray nuclei was flown on high-altitude balloon from Fort Sumner, NM, in 1991 September. We describe the design and performance of this instrument and discuss the data analysis procedures. The measurement provides a new determination of the absolute flux and differential energy spectrum of the primary cosmic-ray species helium between 40 and 320 GeV/nucleon. The experiment also yields the spectra of carbon and oxygen and some information on the intensities of the secondary nuclei Li, Be, and B. A comparison between our results and previous measurements of heavier nuclei (Z greater than or equal to 4) from HEAO 3 and Spacelab 2 indicates good consistency between these measurements. The data set is compared with the results of a leaky box propagation model. We find good agreement with this model if the abundance of helium relative to oxygen at the source is taken to be 25 +/- 6 and if the source spectrum is given by a power law in energy proportional to E-2.15.

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