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KINOSHITA, N; PAUL, M; NAKANISHI, T; PARDO, R. C; REHM, K. E; ROBERTSON, D; SCOTT, R; SCHMITT, C; TANG, X. D; VONDRASEK, R; YOKOYAMA, A; KASHIV, Y; COLLON, P; DEIBEL, C. M; DIGIOVINE, B; GREENE, J. P; HENDERSON, D. J; JIANG, C. L; MARLEY, S. T
Science (American Association for the Advancement of Science), 03/2012, Volume: 335, Issue: 6076Journal Article
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 plus or minus 7 (1 sigma ) million years, which is shorter than the currently used value of 103 plus or minus 5 million years. This half-life value implies a higher initial 146Sm abundance in the early solar system, (146Sm/144Sm)0 = 0.0094 plus or minus 0.0005 (2 sigma ), 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.
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