On the importance of interstellar helium for the propagation of heavy cosmic rays

Details On the importance of interstellar helium for the propagation of heavy cosmic rays On the importance of interstellar helium for the propagation of heavy cosmic rays

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....3...61f&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 3 p 61-62 (SEE N85-34862 23-93)

Computer Science

Cross Sections, Fragmentation, Galactic Cosmic Rays, Galactic Radiation, Helium, Hydrogen, Interstellar Gas, Ionization Cross Sections, Scattering Cross Sections, Cosmic Ray Showers, Interstellar Chemistry, Interstellar Matter

Scientific paper

The influence of interstellar He on the fragmentation of heavy cosmic rays in the interstellar medium (ISM) has long been a controversial subject. While H-induced cross section data are now avialable over broad mass and energy ranges, little data for He-induced fragmentation exists. With the recent reports of accurate measurements of the secondary/primary ratios in cosmic rays and of H-induced cross sections the problem of including interstellar He in propagation calculations becomes even more critical. As is argued the escape lengths lambda e deduced from the B/C+) and Sc-Cr/Fe ratios cannot be reconciled within the frame of a simple leaky box model assuming the ISM composed of pure H. It is quite remarkable that the discrepancy is especially large in the GeV region where (1) secondary/primary ratios measured by several groups agree fairly well and (2) fragmentation cross sections have been recently measured with good accuracy.

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