Uses for uranium-233: what should be kept for future needs? ORNL 6952, 7 (1999). The 229Th isomer: prospects for a nuclear optical clock. 7th Symposium on Frequency Standards and Metrology, ISFSM 2008, 532–538 (World Scientific, 2009). Prospects for a nuclear optical frequency standard based on thorium-229. Properties of the optical transition in the 229Th nucleus. Lasers as a bridge between atomic and nuclear physics. The 229-thorium isomer: doorway to the road from the atomic clock to the nuclear clock. Nuclear clocks based on resonant excitation of γ-transitions. Features of the low-energy level scheme of 229Th as observed in the α-decay of 233U. A detailed theoretical analyis of the achievable accuracy of a 229 Th nuclear clock with trapped ions. Single-ion nuclear clock for metrology at the 19th decimal place. Proposal of a high-precision optical nuclear clock based on 229 Th.Ĭampbell, C. Nuclear laser spectroscopy of the 3.5 eV transition in Th-229. A new method of measuring nuclear magnetic moment. Über die hyperfeinstruktur des Europiums. Zur Frage der theoretischen Deutung der Satelliten einiger Spektrallinien und ihrer Beeinflussung durch magnetische Felder. Because the nuclear transition energy is in the range of transitions of valence electrons, the electronic state may influence the nuclear excitation and decay rates.īecause of a fine balance of contributions from the strong and electromagnetic interactions to the nuclear transition energy, a 229Th clock would be sensitive to predicted effects of physics beyond the standard model, such as temporal or spatial variations of fundamental constants. Thorium-229 is studied as trapped atomic ions in vacuum or doped into transparent crystals such as CaF 2. Recent experiments have provided essential information on the nuclear properties of 229Th (half-life 7,920 years), such as the nuclear moments, decay modes of the isomer and a more precise value of the isomer excitation energy, which is required to achieve laser excitation. The 229Th nucleus is the prime candidate for the realization of a nuclear clock because it possesses a low-energy (8 eV) excited state that is amenable to resonant laser excitation from the nuclear ground state, with an expected natural linewidth in the millihertz range. A nuclear clock, based on a radiative transition in the nucleus, is less sensitive to external perturbations and therefore potentially more precise than established atomic clocks that are based on transitions in the electron shell.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |