ISSN:
1572-9540
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Kinematics predicts the severe suppression of low-energy (〈1 GeV) secondary antiprotons in the Galactic cosmic rays. Thus the observation several years ago of a finite flux of low-energy antiprotons could not be explained with existing models of cosmic ray propagation, which led to a plethora of theoretical speculation. We have recently flown a balloon-borne instrument to measure the energy spectrum of cosmic-ray $$\bar p's$$ , and have found no antiprotons in the energy interval 200–640 MeV (corrected to the top of the atmosphere). This yields an upper limit to the $$\bar p/p$$ ratio of 5.5×10−5 (90% confidence level), well below and hence contradicting the earlier result.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02398661
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