  We report the first measurement of the isotope fraction of europium (151Eu
and 153Eu) for the extremely metal-poor, r-process-enhanced star CS31082-001,
based on high-resolution spectra obtained with the Subaru Telescope High
Dispersion Spectrograph. We have also obtained new measurements of this ratio
for two similar stars with previous europium isotope measurements, CS22892-052
and HD115444. The measurements were made using observations of the Eu lines in
these spectra that are most significantly affected by isotope shifts and
hyperfine splitting. The fractions of 151Eu derived for CS31082-001,
CS22892-052, and HD115444 are 0.44, 0.51, and 0.46, respectively, with
uncertainties of about +/-0.1. CS31082-001, the first star with a meaningful
measurement of U outside of the solar system, is known to exhibit peculiar
abundance ratios between the actinide and rare-earth elements (e.g., Th/Eu),
ratios that are significantly different from those for other stars with large
excesses of r-process elements, such as our two comparison objects.
Nevertheless, our analysis indicates that the Eu isotope ratio of CS31082-001
agrees, within the errors, with those of other r-process-enhanced objects, and
with that of solar-system material.
