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On the Problems of Creating a Nuclear-Optical Frequency Standard Based on $^{229}Th$

Transactions of IAA RAS, issue 65, 23–28 (2023)

Keywords: isomer $^{229m}Th$, nuclear-optical clock, frequency standard

Abstract

The most probable candidate for the role of a nuclear optical standard is the 8-eV isomer of the $^{229m}Th$ isotope of the thorium nucleus. Ways of using the resonant 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 of atomic nuclei leading to the creation of a next-generation frequency standard and nuclear-optical clocks based on them are discussed. The implementation of the project requires the refinement of the energy of the isomer up to the width of the nuclear line. This can be done by resonant optical pumping. Its practical implementation is impossible without using the resonant properties of the electron shell. In neutral atoms, they are reduced to internal conversion; in ionized atoms, resonant conversion takes its place. The first path is supposed to be implemented on the basis of the JILA University. Internal conversion leads to a broadening of the nuclear line by nine orders of magnitude, which facilitates the search for resonance to a practically feasible level. The article discusses the second way in detail. It is shown that it will increase the efficiency of the experiment by another 3–5 orders of magnitude. The article discusses important principles of resonant optical pumping, such as the presence of a finite width in the intermediate electronic state, and others that are usually overlooked with a fatal result for the experiment.

Citation

Text

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RIS

F. F. Karpeshin, L. F. Vitushkin. On the Problems of Creating a Nuclear-Optical Frequency Standard Based on $^{229}Th$ // Transactions of IAA RAS. — 2023. — Issue 65. — P. 23–28.

@article{karpeshin2023,
  abstract = {The most probable candidate for the role of a nuclear optical standard is the 8-eV isomer of the $^{229m}Th$ isotope of the thorium nucleus. Ways of using the resonant 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 of atomic nuclei leading to the creation of a next-generation frequency standard and nuclear-optical clocks based on them are discussed.
The implementation of the project requires the refinement of the energy of the isomer up to the width of the nuclear line. This can be done by resonant optical pumping. Its practical implementation is impossible without using the resonant properties of the electron shell. In neutral atoms, they are reduced to internal conversion; in ionized atoms, resonant conversion takes its place. The first path is supposed to be implemented on the basis of the JILA University. Internal conversion leads to a broadening of the nuclear line by nine orders of magnitude, which facilitates the search for resonance to a practically feasible level.
The article discusses the second way in detail. It is shown that it will increase the efficiency of the experiment by another 3–5 orders of magnitude. The article discusses important principles of resonant optical pumping, such as the presence of a finite width in the intermediate electronic state, and others that are usually overlooked with a fatal result for the experiment.},
  author = {F.~F. Karpeshin and L.~F. Vitushkin},
  doi = {10.32876/ApplAstron.65.23-28},
  issue = {65},
  journal = {Transactions of IAA RAS},
  keyword = {isomer $^{229m}Th$, nuclear-optical clock, frequency standard},
  pages = {23--28},
  title = {On the Problems of Creating a Nuclear-Optical Frequency Standard Based on $^{229}Th$},
  url = {http://iaaras.ru/en/library/paper/2155/},
  year = {2023}
}

TY  - JOUR
TI  - On the Problems of Creating a Nuclear-Optical Frequency Standard Based on $^{229}Th$
AU  - Karpeshin, F. F.
AU  - Vitushkin, L. F.
PY  - 2023
T2  - Transactions of IAA RAS
IS  - 65
SP  - 23
AB  - The most probable candidate for the role of a nuclear optical
standard is the 8-eV isomer of the $^{229m}Th$ isotope of the thorium
nucleus. Ways of using the resonant 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 of atomic nuclei leading to the creation of a next-
generation frequency standard and nuclear-optical clocks based on
them are discussed.  The implementation of the project requires the
refinement of the energy of the isomer up to the width of the nuclear
line. This can be done by resonant optical pumping. Its practical
implementation is impossible without using the resonant properties of
the electron shell. In neutral atoms, they are reduced to internal
conversion; in ionized atoms, resonant conversion takes its place.
The first path is supposed to be implemented on the basis of the JILA
University. Internal conversion leads to a broadening of the nuclear
line by nine orders of magnitude, which facilitates the search for
resonance to a practically feasible level.  The article discusses the
second way in detail. It is shown that it will increase the
efficiency of the experiment by another 3–5 orders of magnitude. The
article discusses important principles of resonant optical pumping,
such as the presence of a finite width in the intermediate electronic
state, and others that are usually overlooked with a fatal result for
the experiment.
DO  - 10.32876/ApplAstron.65.23-28
UR  - http://iaaras.ru/en/library/paper/2155/
ER  -