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)|
|Number of pages||4|
|Journal||Physical Review Letters|
|Issue number||27 I|
|State||Published - Dec 31 2001|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)