A search for antihelium with BESS spectrometer

Details A search for antihelium with BESS spectrometer A search for antihelium with BESS spectrometer

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....5.1711s&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

1

Scientific paper

We have searched for antihelium nuclei in cosmic rays using the data obtained from balloon flights of the BESS magnetic spectrometer, flown in 1999 and 2000 at Lynn Lake, Canada. The search was mainly based on track quality selection and rigidity analysis and on the time-offlight and dE/dx measurements of the scintillation counter hodoscope. No events were observed in the energy range from 1 to 14 GV. Combined with the data collected in the previous flights since 1993, a new upper limit for the ratio of ¯He/He at the top of the atmosphere has been obtained to be 7 × 10-7 after correcting for the interactions in the air and in the instruments.

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