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- W2002077255 abstract "In two long-duration balloon flights over Antarctica, the Balloon-borne Experiment with a Superconducting Spectrometer (BESS) collaboration has searched for antihelium in the cosmic radiation with the highest sensitivity reported. 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 8.4×106 |Z|=2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0×107 |Z|=2 nuclei from 1.0 to 14 GV. Assuming antihelium to have the same spectral shape as helium, a 95% confidence upper limit to the possible abundance of antihelium relative to helium of 6.9×10−8 was determined combining all BESS data, including the two BESS-Polar flights. With no assumed antihelium spectrum and a weighted average of the lowest antihelium efficiencies for each flight, an upper limit of 1.0×10−7 from 1.6 to 14 GV was determined for the combined BESS-Polar data. Under both antihelium spectral assumptions, these are the lowest limits obtained to date.Received 13 January 2012DOI:https://doi.org/10.1103/PhysRevLett.108.131301© 2012 American Physical Society" @default.
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- W2002077255 date "2012-03-29" @default.
- W2002077255 modified "2023-10-18" @default.
- W2002077255 title "Search for Antihelium with the BESS-Polar Spectrometer" @default.
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- W2002077255 doi "https://doi.org/10.1103/physrevlett.108.131301" @default.
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