Physics
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.271..425p&link_type=abstract
Nature, vol. 271, Feb. 2, 1978, p. 425, 426.
Physics
2
Abundance, Calcium Isotopes, Cosmic Rays, Spallation, Cross Sections, Iron, Mass Spectroscopy
Scientific paper
Ratios of cross-sections for calcium production by spallation (at 600 MeV and at 21 GeV) of iron were calculated, and the data are incorporated in a discussion of the origin of cosmic ray calcium nuclei. The belief that cosmic ray calcium nuclei originate in about equal proportions from the sources and from spallation in the interstellar medium was challenged by the Simpson et al. (1977) finding that the calcium is largely Ca-42 with no Ca-40, which suggests that all the calcium nuclei result from spallation if, as they assume, the cross-sections for calcium production by spallation of iron are much larger than those calculated by Silberberg and Tsao's (1973) formula. The present data, although not highly precise, agree with the calculated values, and reasons for the unlikelihood that the observed cosmic ray calcium abundance is entirely due to interstellar spallation are discussed.
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