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- W78936223 abstract "The extinct p-process nuclide 146Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its alpha-decay daughter 142Nd. Based on analyses of 146Sm/147Sm alpha-activity and atom ratios, we determined the half-life of 146Sm to be 68 pm 7 (1sigma) million years (Ma), which is shorter than the currently used value of 103 pm 5 Ma. This half-life value implies a higher initial 146Sm abundance in the early solar system, (146Sm/144Sm_0 = 0.0094pm0.0005 (2sigma), 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." @default.
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- W78936223 date "2011-09-22" @default.
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- W78936223 title "Shorter 146Sm half-life and revised 146Sm-142Nd ages of planetary mantle differentiation" @default.
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