Isotopic astrophysics.

Details Isotopic astrophysics. Isotopic astrophysics.

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992auja....4..171d&link_type=abstract

Aust. J. Astron., Vol. 4, No. 4, p. 171 - 184

Astronomy and Astrophysics

Astrophysics

Scientific paper

The isotopic uniformity and homogeneity of the chemical elements within our Solar System has been a long-standing question which has stood at the centre of attention since the early days of mass spectrometry. Those isotopic variations that had been found before the 1970s could usually be explained by the effect of cosmic radiation upon matter or by radioactive decay, so that it was widely accepted that Solar System material was isotopically homogeneous. This simple picture of a homogeneous solar nebula had to be drastically revised following the discovery of isotopic anomalies in meteorites. These anomalies are isotopically distinct with respect to the bulk Earth and cannot be explained by mass fractionation, cosmic ray spallation or radioactive decay. Such anomalies have been found in a wide range of gaseous and solid elements extracted from extra-terrestrial materials. These isotopic data provide new constraints for nucleosynthetic models in nuclear astrophysics - models which not only attempt to attribute various nucleosynthetic processes to specific classes of stars, but also to express locations and mechanisms occurring within these stars.

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