Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.223.1263g&link_type=abstract
Nature, Volume 223, Issue 5212, pp. 1263-1264 (1969).
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
WHEN oxygen is spallated with high energy protons, one of the possible reaction products is the radionuclide 10Be (half-life, 2.7 × 106 yr). Knowledge of the cross-section for this reaction is of considerable importance in cosmic ray physics1 and nuclear astrophysics2, but the direct measurements that exist for this are in disagreement by a factor of about 8. Honda and Lal3 measured 10Be radiochemically in a carbon target bombarded with 220 MeV protons and gave a value for its production cross-section as (1.8 +/- 0.6) mb. This becomes 2.2 mb after correction for the latest monitor cross-section. Honda and Lal also found a similar value in a target. The correctness of these measurements and their applicability to the spal-lation of atmospheric air nuclei have been demonstrated by the good agreement between the measured deposition rate of cosmogenic 10Be from atmospheric fall-out with the calculated ``global'' production rate based on the cross-section data4.
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