RETRACTED: A Shorter 146 Sm Half-Life Measured and Implications for 146 Sm- 142 Nd Chronology in the Solar System
- 30 March 2012
- journal article
- retracted article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 335 (6076), 1614-1617
- https://doi.org/10.1126/science.1215510
Abstract
The extinct p-process nuclide 146Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its α-decay daughter 142Nd. Based on analyses of 146Sm/147Sm α-activity and atom ratios, we determined the half-life of 146Sm to be 68 ± 7 (1σ) million years, which is shorter than the currently used value of 103 ± 5 million years. This half-life value implies a higher initial 146Sm abundance in the early solar system, (146Sm/144Sm)0 = 0.0094 ± 0.0005 (2σ), than previously estimated. Terrestrial, lunar, and martian planetary silicate mantle differentiation events dated with 146Sm-142Nd converge to a shorter time span and in general to earlier times, due to the combined effect of the new 146Sm half-life and (146Sm/144Sm)0 values.Other Versions
This publication has 44 references indexed in Scilit:
- Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflowsJournal of Cosmology and Astroparticle Physics, 2012
- Early Silicate Earth DifferentiationAnnual Review of Earth and Planetary Sciences, 2011
- Alpha decay half-life of 147Sm in metal samarium and Sm2O3The European Physical Journal A, 2010
- Old Sm–Nd ages for cumulate eucrites and redetermination of the solar system initial 146Sm/144Sm ratioEarth and Planetary Science Letters, 2010
- Super-chondritic Sm/Nd ratios in Mars, the Earth and the MoonNature, 2008
- Coupled 142 Nd- 143 Nd Isotopic Evidence for Hadean Mantle DynamicsScience, 2007
- 142 Nd Evidence for Early (>4.53 Ga) Global Differentiation of the Silicate EarthScience, 2005
- Evidence from coupled 147Sm–143Nd and 146Sm–142Nd systematics for very early (4.5-Gyr) differentiation of the Earth's mantleNature, 1992
- 146Sm: A Chronometer for p-Process NucleosynthesisNature, 1972
- The natural alpha radioactivity of samariumJournal of Inorganic and Nuclear Chemistry, 1970