On the problems of creating a nuclear-optical frequency standard based on 229Th

F.F. Karpeshin, M.B. Trzhaskovskaya, L.F. Vitushkin

D.I. Mendeleyev Institute for Metrology, St. Petersburg, Russia

Al’manac of Modern Metrology № 1 (29) 2022, pages 30–42

Abstract. The most probable candidate for the role of a nuclear optical standard is the 8.2-eV isomer of229mTh. The use of the resonance properties of the electron shell as an optical resonator to create laser-nuclear technologies necessary for the optical pumping of nuclear isomers and other manipulations with atomic nuclei, leading to the creation of a next-generation frequency standard and nuclear-optical clock based on them, is discussed.

Keywords: isomer 229mTh, nuclear-optical clock, frequency standard.

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