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The probability of spontaneous magnetic dipole emission in a transparent dielectric medium with refractive index n is shown to be n 3 times higher than in vacuum. The decay of a low-lying nuclear 229 m Th(3/2 + , 3.5±1.0 eV) level in the 229 ThO 2 dielectric is discussed.
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E. V. Tkalya (2000) studied this question.
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