Eu isotopic analyses of SiC grains from the Murchison Meteorite

摘要

We report Eu isotopic analyses of single SiC grains from primitive meteorites using the Sensitive High Resolution Ion Microprobe. The results are compared with Eu isotopic ratios predicted from the recently determined ~l5lSm(n, γ) cross sections and the thermally pulsed s-process model of AGB stars. The observed Eu isotopic compositions of SiC grains place constraints on s-process conditions such as the temperature and neutron densities in AGB stars.