Measurement of Cosmic-Ray H and He Isotopes in a Series of Annual Balloon Flights

Details Measurement of Cosmic-Ray H and He Isotopes in a Series of Annual Balloon Flights Measurement of Cosmic-Ray H and He Isotopes in a Series of Annual Balloon Flights

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3...37w&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

The isotopes of cosmic-ray H and He have been measured by the Balloon Borne Experiment with a Super-conducting Solenoid Spectrometer (BESS), which has been flown annually since 1993. We present here the absolute flux of 2 H and 3 He corrected to the top of the atmosphere. In the data analysis, the nuclear cross sections of H, He and their isotopes, which show strong energy dependence between 200 MeV/n and above 1 GeV/n, are critical for performing the efficiency corrections. These include corrections of nuclear interactions inside the BESS instrument, atmosphere attenuation, and atmospheric secondary particle production. The latest available cross section data and their parameterizations were utilized in the simulation code developed for this study.

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