A search for antihelium down to 10-6 relative to helium

Details A search for antihelium down to 10-6 relative to helium A search for antihelium down to 10-6 relative to helium

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3...85n&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

A search for cosmic ray antihelium has been made using the data obtained with the BESS magnetic rigidity spectrometer during the '97 and '98 flights from Lynn Lake, Canada. The search is based on precise measurements of rigidity, time-of-flight and dE/dx. No antihelium candidate is observed in the rigidity range from 1 to 16 GV/c. By combining these data with the results from previous flights, a new upper limit of 1 10Ð6 is obtained on the He / He ratio at the top of the atmosphere after correcting for interaction losses in the air and the instruments.

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