title: Search for cosmic-ray antideuterons.
abstract: We performed a search for cosmic-ray antideuterons using data collected during four BESS balloon flights from 1997 to 2000. No candidate was found. We derived, for the first time, an upper limit of 1.9 x 10(-4) (m2s sr GeV/nucleon)(-1) for the differential flux of cosmic-ray antideuterons, at the 95% confidence level, between 0.17 and 1.15 GeV/nucleon at the top of the atmosphere.
authors.affiliation: Institute of Space and Astronautical Science (ISAS/JAXA), Sagamihara, Kanagawa 229-8510, Japan. fuke@balloon.isas.jaxa.jp
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authors.lastname: Fuke
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authors.lastname: Maeno
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authors.lastname: Abe
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authors.lastname: Makida
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authors.lastname: Suzuki
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authors.lastname: Tanaka
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authors.lastname: Yoshida
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authors.lastname: Yoshimura