Abstract
Sm–Nd chronometers use \(^{146}\)Sm and \(^{147}\)Sm to determine the ages of major events in the early Solar System. Their half-lives are the most important nuclear parameters determining the accuracy of chronometry. However, the \(^{146}\)Sm half-life is not well-established: the published values differ by \(\sim\)30%, which results in significant uncertainties in the Solar System timeline. We are re-measuring the half-lives of \(^{146}\)Sm and \(^{147}\)Sm using decay energy spectroscopy and metallic magnetic calorimeters to improve the accuracy of the Sm–Nd chronometers. We report recent experimental results from our first measurement of a \(^{147}\)Sm source, as well as status and plans for experiments on \(^{146}\)Sm.
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Acknowledgements
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. This work was funded by the Laboratory Directed Research and Development program of Lawrence Livermore National Laboratory (20-LW-024). This work was supported in part by the Department of Energy National Nuclear Security Administration, Consortium for Monitoring, Verification and Technology (DE-NE000863). This work was also supported in part by the Department of Energy National Nuclear Security Laboratory Research Graduate Fellowship. The work at Institute for Basic Science is supported by Grant no. IBS-R016-A2. LLNL-JRNL-828595. Data used in this manuscript cannot be made available.
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Kim, G.B., Borg, L.E., Boyd, S.T.P. et al. Absolute Decay Counting of \(^{146}\)Sm and \(^{147}\)Sm for Early Solar System Chronology. J Low Temp Phys 209, 824–831 (2022). https://doi.org/10.1007/s10909-022-02798-6
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DOI: https://doi.org/10.1007/s10909-022-02798-6