Production by Cosmic Rays of Helium-3 in Meteorites

Details Production by Cosmic Rays of Helium-3 in Meteorites Production by Cosmic Rays of Helium-3 in Meteorites

Aug 1953

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1953natur.172..200p&link_type=abstract

Nature, Volume 172, Issue 4370, pp. 200-201 (1953).

Physics

11

Scientific paper

THE helium content of iron meteorites varies from less than 10-9 c.c. to 4 × 10-5 c.c. per gm.1. Since their uranium and thorium content is fairly constant, this variation was considered as an indication of their very different ages. During the past decade, however, it has been discovered that by the impact of cosmic rays on matter helium is formed, and Bauer2 and Huntley3 have pointed out that a considerable part of the meteoritie helium might have this origin. Although attempts to calculate this amount on the basis of our published figures and of certain assumptions about the masses of meteorites4 were open to criticism5, it was predicted6,7 from cosmic ray observations that in meteoritie helium the proportion of helium-3 to helium-4 may amount to about 30 per cent, and in five iron meteorites helium-3/helium-4 ratios varying from 17.8 to 31.5 per cent were found8.

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