Search for antihelium in cosmic rays

Details Search for antihelium in cosmic rays Search for antihelium in cosmic rays

2000-02-17

arxiv.org/abs/hep-ex/0002048v1

Phys.Lett. B461 (1999) 387-396

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages, Latex, 9 .eps figures

Scientific paper

10.1016/S0370-2693(99)00874-6

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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