Nuclear Magnetic Moment of the First Excited State (I=2⁺) of ²³⁸U

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The ²³⁸U Mössbauer effect of UO₂ has been investigated in the temperature range from 5.4, K to 280, K. Nuclear Zeeman splitting of the ²³⁸U nucleus in antiferromagnetic UO₂ at 5.4, K is 59.1± 3.9, mm, s^-1 and corresponds to the value of 252.3± 0.5, T obtained by the ²³⁵U pulsed NMR technique. The nuclear magnetic moment of the first excited state (I=2⁺) of ²³⁸U has been determined to be 0.254± 0.015μ _N. The conversion factor of 4.27± 0.28, T/mm, s^-1 enables us to determine the hyperfine magnetic field at the ²³⁸U nucleus using ²³⁸U Mössbauer spectroscopy. The temperature dependence of the recoil-free fraction of the ²³⁸U Mössbauer effect in UO₂ has been discussed.