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Shikaze, Y. Takasugi, Z. Myers","submitted_at":"2012-01-13T22:51:54Z","abstract_excerpt":"In two long-duration balloon flights over Antarctica, the BESS-Polar collaboration has searched for antihelium in the cosmic radiation with higher sensitivity than any reported investigation. BESS- Polar I flew in 2004, observing for 8.5 days. BESS-Polar II flew in 2007-2008, observing for 24.5 days. No antihelium candidate was found in BESS-Polar I data among 8.4\\times 10^6 |Z| = 2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0\\times 10^7 |Z| = 2 nuclei from 1.0 to 14 GV. 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