Abstract
A study on the measurement of the antiproton-to-proton abundance ratio in the cosmic radiation was performed. The HEAT-pbar instrument, a balloon magnet spectrometer was flown successfully in Spring 2000. It was observed that 71 antiprotons were identified above the vertical geomagnetic cutoff rigidity of 4.2 GV. The antiproton-to-proton ratio was found to be agreed with that expected from a purely secondary origin of antiprotons produced by primary protons with a standard soft energy spectrum.
Original language | English (US) |
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Article number | 271101 |
Pages (from-to) | 2711011-2711014 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 87 |
Issue number | 27 I |
State | Published - Dec 31 2001 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy