TL;DR
This study used the AMS on the space shuttle to search for antihelium in cosmic rays, finding none and setting a new upper limit on its flux ratio relative to helium.
Contribution
First search for antihelium in cosmic rays using AMS data, establishing the most stringent upper limit to date.
Findings
No antihelium nuclei detected
Upper limit on antihelium/helium flux ratio < 1.1 x 10^-6
Large dataset of helium nuclei observed
Abstract
The Alpha Magnetic Spectrometer (AMS) was flown on the space shuttle Discovery during flight STS-91 in a 51.7 degree orbit at altitudes between 320 and 390 km. A total of 2.86 * 10^6 helium nuclei were observed in the rigidity range 1 to 140 GV. No antihelium nuclei were detected at any rigidity. An upper limit on the flux ratio of antihelium to helium of < 1.1 * 10^-6 is obtained.
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