New measurements of charge-changing cross sections in carbon and hydrogen targets above 2 GeV per nucleon: Evidence for an energy dependence that may strongly affect estimates of the energy dependence of cosmic-ray diffusion in the galaxy

Details New measurements of charge-changing cross sections in carbon and hydrogen targets above 2 GeV per nucleon: Evidence for an energy dependence that may strongly affect estimates of the energy dependence of cosmic-ray diffusion in the galaxy New measurements of charge-changing cross sections in carbon and hydrogen targets above 2 GeV per nucleon: Evidence for an energy dependence that may strongly affect estimates of the energy dependence of cosmic-ray diffusion in the galaxy

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...429..764w&link_type=abstract

The Astrophysical Journal, vol. 429, no. 2, pt. 1, p. 764-766

Astronomy and Astrophysics

Astrophysics

5

Carbon, Charge Exchange, Cosmic Rays, Galaxies, Hydrogen, Ionization Cross Sections, Particle Acceleration, Particle Diffusion, Energy Distribution, Position Sensing, Proportional Counters, Scintillation Counters, Silicon

Scientific paper

We have recently measured the fragmentation of approximately 15 GeV per nucleon Si nuclei in CH2 and C targets and, by subtraction, H targets, at Brookhaven. The total-changing cross section for Si is larger than we measured earlier at approximately 1.3 GeV per nucleon. At the same time the partial cross sections for charge changes of 1 and 2 are approximately 20% to 50% smaller for all targets including H. An overall systematic behavior is observed for the ratio of the 15 GeV per nucleon to 1.3 GeV per nucleon partial cross sections as a function of the magnitude of the charge change. These results, when coupled with earlier measurements of the fragmentation of high energy O right arrow N and Si right arrow Al by the Siegen group (Hirzebruch et al. 1991), which also show a decrease in the partial cross sections for charge changes of 1 and 2 above 1 to 2 GeV per nucleon in H targets, have major implications for the energy dependence of the propagation of Galactic cosmic rays. This is because the B/C ratio is used to determine this dependence and the main channel for B production, C right arrow B, should also show a decreasing cross section with increasing energy according to the above argument. We will present this new cross-section data and examine their implications for the propagation of cosmic rays.

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