Astronomy and Astrophysics · 2002 · 91 citations · 4 references
Natural SciencesPhysicsAstrophysicsSpectroscopyStellar AstronomyLaser SpectroscopyNuclear DecayOscillatorsRadio SpectroscopyRadioactive DecayBranching FractionsLaser-induced FluorescenceLaser-induced Fluorescence SpectroscopyLevelsNuclear LifetimesOscillator StrengthsRadiative Decay RateRadiative Lifetimes
We have measured radiative lifetimes of ten Th II levels by using the laser-induced fluorescence technique and branching fractions with Fourier transform spectroscopy. By combining the new branching fractions with a total of 23 lifetimes, from the present work and from measurements by Simonsen et al. ([CITE]), absolute oscillator strengths for 180 lines have been derived. Some of these new f-values reported are relevant for radioactive dating of stars.
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Measurement of stellar age from uranium decay
R. Cayrel, V. Hill, Timothy C. Beers et al. · Nature · 2001 · 389 citations · Full text
Lifetime measurements and absolute oscillator strengths for single ionized thorium (ThII).
H.R. Simonsen, T. Worm, Poul Jessen et al. · Physica Scripta · 1988 · 11 citations