Search for antihelium in cosmic rays.
Abstract
The alpha magnetic spectrometer (AMS) was flown on the space shuttle Discovery during flight STS-91 in a 51.7° orbit at altitudes between 320 and 390 km. A total of 2.86×106 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.
- Publication:
-
Physics Letters B
- Pub Date:
- September 1999
- DOI:
- 10.1016/S0370-2693(99)00874-6
- arXiv:
- arXiv:hep-ex/0002048
- Bibcode:
- 1999PhLB..461..387A
- Keywords:
-
- Cosmic Rays: Antimatter;
- High Energy Physics - Experiment;
- Astrophysics
- E-Print:
- 18 pages, Latex, 9 .eps figures