Search for antihelium: Progress with BESS

Details Search for antihelium: Progress with BESS Search for antihelium: Progress with BESS

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008adspr..42..450s&link_type=abstract

Advances in Space Research, Volume 42, Issue 3, p. 450-454.

Physics

6

Scientific paper

In this paper, we report searches for antihelium in cosmic rays using two recently flown magnetic rigidity spectrometers. BESS-TeV had extended rigidity with an MDR of 1.4 TV and had a flight duration of one day. BESS-Polar was optimized for collecting power. It was flown for 8.5 days and had an MDR of 240 GV. The former flight allows us to explore a previously unexplored rigidity band and the latter flight yields a factor of three improvement in the overall BESS limit. No antihelium candidate was found in the rigidity ranges of 1 500 GV, and 0.6 20 GV, among 7 × 104 events taken with BESS-TeV, and 8 × 106 events taken with BESS-Polar, respectively.

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