Search for antihelium in cosmic rays
arXiv:hep-ex/0002048 · doi:10.1016/S0370-2693(99)00874-6
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.
18 pages, Latex, 9 .eps figures