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The 7.6 eV electromagnetic transition between the nearly degenerate ground state and first excited state in the Th-229 nucleus may be very sensitive to potential changes in the fine-structure constant, $\alpha = e^2/\hbar c$.
E. Segrè, Nuclei and Particles (Benjamin-Cummings, Reading, MA, 1977)
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D. R. Lide, ed., CRC Handbook of Chemistry and Physics (Internet Version 2009) (CRC Press/Taylor and Francis, Boca Raton, FL, 2009), 89th ed
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