Evidence for anomalous g107Ag and g109Ag compositions in iron meteorites

Details Evidence for anomalous g107Ag and g109Ag compositions in iron meteorites Evidence for anomalous g107Ag and g109Ag compositions in iron meteorites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nimpb.123..414d&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section B, v. 123, p. 414-423.

Physics

Scientific paper

We have applied an in-situ method of Accelerator Mass Spectrometry (AMS) to determine g107Ag and g109Ag compositions in several groups of iron meteorites and we have observed extreme variations of g107Ag and g109Ag counting rates from those samples as a function of measurement sequence. In contrast, no significant variation in the counting rate of d108Pd has been seen. These data do not necessarily imply anomalous isotope ratios, and may be due to the incidence of minute inclusions in diverse geometric forms and orientations, and with variable content of either or both Ag isotopes. The results could, however, be attributed to the preservation of presolar grains at sub-μm scales in iron meteorites. To test this possibility, a method of simultaneous AMS measurement of the isotopes must be developed.

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