Computer Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27q.305w&link_type=abstract
Meteoritics, vol. 27, no. 3, volume 27, page 305
Computer Science
3
Scientific paper
A gabbro sphere of 25 cm radius has been irradiated isotropically with 1.6 GeV protons (Michel et al., 1991) and the production of Ar and Ne from Ca and K located at various positions within the sphere has been measured. Some of the essential results are 1) From Ca the production rate of ^38Ar increases by 40% upon going from surface to center; the production ratios ^36Ar/^38Ar = 0.41 and ^39Ar/^38Ar = 0.132 are constant with depth to within better than 5%. ^21Ne is constant to within 10%, ^38Ar/^21Ne increases from 12.4 near the surface to 19.4 near the center. The yield distribution along isobar 36 among ^36Cl and ^36Ar is distinctly different for the production from FeNi and Ca. In the case of Ca the production of ^36Ar--including its short-lived radioactive precursors--is approximately twice that of ^36Cl while for FeNi it is only about one fourth, in accordance with observations in meteorites (Begemann et al., 1976). 2) From K the production throughout the sphere of ^38Ar is 1.62 times that on Ca. The ^36Ar yield from K is about half that from Ca, for ^39Ar it is seven times higher. Compared to Ca the ^36Ar/^38Ar ratio is very much lower (<0.114-0.122) and the ^39Ar/^38Ar ratio very much higher (<0.49-0.60), with both ratios increasing from surface to center. References: Begemann, F., Weber H.W., Vilcsek E. and Hintenberger, H. (1976) Geochim. Cosmochim. Acta 40, 353-368 Michel, R. et al. (1992) Meteoritics 26, 372 a. Figure 1, which in the hard copy appears here, shows the distribution with depth of ^38,39Ar from irradiation of Ca and K by 1.6 GeV protons within a gabbro sphere of 25 cm radius. Targets were K- and Ca-molybdate; contributions to the production from Mo have been neglected.
Begemann Friedrich
Weber Harald W.
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