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One of the main themes of my research is to understand the timing of events in the early solar system through the investigation of short-lived radionuclides. Short-lived radionuclides were present in the early solar system, but because of their short half-lives have completely decayed away. Evidence of their former presence is found as excesses of the stable daughter nuclides in various early solar system objects. The nuclides that are currently most useful for chronology are 26Al and 53Mn. The relative chronologies inferred from these nuclides can be put on an absolute time scale by comparing with the 207Pb-206Pb long-lived chronometer.
A major current effort is to develop 60Fe as an early solar system chronometer. This nuclide seems promising for studies of the timing of chondrule formation and the timing of aqueous alteration of meteorite parent bodies.
The presence of 60Fe in primitive meteorites also permits us to study the environment in which the solar system formed. 60Fe is only produced in significant quantities by stellar nucleosynthesis, and type II supernovae are a prolific source of 60Fe. By comparing initial abundances of 60Fe, 26Al, 53Mn and other nuclides, we can potentially infer the stellar source for these nuclides and the environment in which the solar system formed.
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ICARUS (2024): 115884
METEORITICS & PLANETARY SCIENCE (2024)
The Planetary Science Journalno. 8 (2023): 144-144
SCIENCE ADVANCESno. 45 (2023)
Nature Astronomyno. 5 (2023): 633-633
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ANALYTICAL CHEMISTRYno. 1 (2023): 170-178
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