The isotopic composition of neon and magnesium in the low energy cosmic raysThe ratios Ne-22/Ne-20 and Mg-26/Mg-24 were measured in galactic cosmic rays by the IMP-7 satellite in the 60 to 230 MeV/nucleon range. The neon cosmic ray source ratio Ne-22/Ne-20 is about 0.38, which is much larger than the current solar system relationship; the Mg data agrees with the solar system isotopic ratio of 0.14 at the cosmic ray source. The Ne and Mg source ratios are explained by supernova models, and become a new constraint which should be satisfied by any model of cosmic ray origin.
Document ID
19810028000
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Garcia-Munoz, M. (Chicago Univ. Chicago, IL, United States)
Simpson, J. A. (Chicago Univ. Chicago, IL, United States)
Wefel, J. P. (Chicago, University Chicago, Ill., United States)