Shorter 146Sm half-life and revised 146Sm-142Nd ages of planetary mantle differentiation

Details Shorter 146Sm half-life and revised 146Sm-142Nd ages of planetary mantle differentiation Shorter 146Sm half-life and revised 146Sm-142Nd ages of planetary mantle differentiation

2011-09-22

arxiv.org/abs/1109.4805v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

39 pages, 9 figures, update of systematic uncertainty in half-life value, submitted for publication

Scientific paper

The extinct p-process nuclide 146Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its alpha-decay daughter 142Nd. We performed a new measurement of the 146Sm half-life and our result, 68 \pm 9 (1sigma) million years (Ma), is significantly shorter than the value currently used of 103 \pm 5 Ma, modifying the early chronology of the Solar System and planetary differentiation. The new half-life value implies a higher initial 146Sm abundance in the Early Solar System, (146Sm/144Sm)_0 = 0.0094\pm0.0005 (2sigma), than derived so far. Terrestrial, Lunar and Martian planetary silicate mantle differentiation events dated by 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.

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