The $$^{146}\text{Sm}$$ 146 Sm half-life re-measured: consolidating the chronometer for events in the early Solar System

Abstract

Abstract The half-life of the extinct radiolanthanide $$^{146}\text{Sm}$$ 146 Sm , important for both geochronological and astrophysical applications, was re-determined by a combination of mass spectrometry and $$\alpha$$ α -decay counting. Earlier studies provided only limited information on all potential factors that could influence the quantification of the half-life of $$^{146}\text{Sm}$$ 146 Sm . Thus, special attention was given here to a complete documentation of all experimental steps to provide information about any possible artifacts in the data analysis. The half-life of $$^{146}\text{Sm}$$ 146 Sm was derived to be 92.0 Ma ± 2.6 Ma, with an uncertainty coverage factor of $$\mathsf{\textit{k}\!=\!1}$$ k = 1 .

Keywords

• $$^{146}$$ 146 Sm half-life
• Isotopic dating
• Early solar system isotopic chronometer
• MC-ICP-MS
• TIMS
• $$\alpha$$ α -Spectrometry