Energy Dependence of the P/P Ratio in Cosmic Rays
Abstract
The antiproton/proton /P(bar)/P/ratio is presented for seven kinetic energy intervals from 4.4  13.4 GeV. The P(bar) were observed in 1979 by the New Mexico State University balloonborne magnet spectrometer. The observations are compared to various models including secondary production in a leaky box. A decline in the P(bar)/P ratio at low energies is expected if the P(bar) are produced as secondaries. The data are consistent with such a decline but the P(bar)/P ratio is much higher than expected. The confidence level is less than 0.0001 for a model based on a leaky box with a meanmattertraversed lambda of 7 gm/sq cm. The best leakyboxmodel fit obtained by varying lambda gives a confidence level of 0.12 for lambda l= 21 + or  3 gm/sq c. Results are also presented for fits based on the closedgalaxy and other models.
 Publication:

Astrophysical Letters
 Pub Date:
 1984
 Bibcode:
 1984ApL....24...75G
 Keywords:

 Antiprotons;
 Cosmic Rays;
 Particle Energy;
 Particle Production;
 Protons;
 Secondary Cosmic Rays;
 Cosmology;
 Energy Spectra;
 Mathematical Models;
 Spectrometers;
 Superconducting Magnets;
 Space Radiation