Cosmic Ray 3He and 4He Spectra from BESS 98

Details Cosmic Ray 3He and 4He Spectra from BESS 98 Cosmic Ray 3He and 4He Spectra from BESS 98

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.1805m&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

4

Scientific paper

The Balloon-b orne experiment with a superconducting spectrometer (BESS) has been flown annually for the past ten years to collect cosmic-ray data. In 1998, the instrument was launched from Lynn Lake Manitoba. During the 22-hour flight, the instrument gathered 38 GB of data, roughly 1.7 × 107 cosmic ray events. The helium isotop es were effectively separated for energies between 0.18 GeV/n and 1.78 GeV/n. Once accounting for atmospheric secondary corrections, the absolute fluxes for 3 He and 4 He were determined for this energy range. These results were compared with the results of previous measurements and theoretical calculations of different propagation models, namely, the Standard Leaky Box model and the Reacceleration model (SLBM). The 3 He/4 He ratio provides information regarding the propagation history of cosmic-rays. Some implications of these results on cosmic ray propagation are presented in this paper.

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