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Principal Questions of the Current Project of Creation of the Nuclear Optical Frequency Standard

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

Transactions of IAA RAS, issue 49, 9–16 (2019)

Keywords: frequency standard, nuclear optical resonance, thorium isomer, nuclear clock

Abstract

There is nothing more practical than a good theory. The Trial-and-Error path to the creation of a nuclear optical clock is analysed in this article from the internal conversion theory point of view only. The example of the $^{229}Th$ nuclide (which is considered to be the most probable candidate for the role of the Nuclear Optical Frequency Standard in future) shows that the interaction of the nucleus with the external field of the laser cannot be considered without paying attention at the properties of the electron shell. Thus, de-excitation of the isomeric state of the 229Th nucleus cannot be observed if the internal conversion is not taken into account. Similarly, the direct laser excitation of the nucleus is an ambiguous way of controlling its frequency. Our article analyses the most common errors in the attempts to manipulate the nucleus without taking into account the properties of the electron shell. Moreover, the dependence of the nuclear properties on the electron shell may cause variations of the isomeric line width in the thorium clock depending on external conditions such as pressure and temperature.

Citation

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RIS

L. F. Vitushkin, F. F. Karpeshin, M. B. Trzhaskovskaya. Principal Questions of the Current Project of Creation of the Nuclear Optical Frequency Standard // Transactions of IAA RAS. — 2019. — Issue 49. — P. 9–16.

@article{vitushkin2019,
  abstract = {There is nothing more practical than a good theory. The Trial-and-Error path to the creation of a nuclear optical clock is analysed in this article from the internal conversion theory point of view only. The example of the $^{229}Th$ nuclide (which is considered to be the most probable candidate for the role of the Nuclear Optical Frequency Standard in future) shows that the interaction of the nucleus with the external field of the laser cannot be considered without paying attention at the properties of the electron shell. Thus, de-excitation of the isomeric state of the 229Th nucleus cannot be observed if the internal conversion is not taken into account. Similarly, the direct laser excitation of the nucleus is an ambiguous way of controlling its frequency. Our article analyses the most common errors in the attempts to manipulate the nucleus without taking into account the properties of the electron shell. Moreover, the dependence of the nuclear properties on the electron shell may cause variations of the isomeric line width in the thorium clock depending on external conditions such as pressure and temperature.},
  author = {L.~F. Vitushkin and F.~F. Karpeshin and M.~B. Trzhaskovskaya},
  doi = {10.32876/ApplAstron.49.9-16},
  issue = {49},
  journal = {Transactions of IAA RAS},
  keyword = {frequency standard, nuclear optical resonance, thorium isomer, nuclear clock},
  pages = {9--16},
  title = {Principal Questions of the Current Project of Creation of the Nuclear Optical Frequency Standard},
  url = {http://iaaras.ru/en/library/paper/1962/},
  year = {2019}
}

TY  - JOUR
TI  - Principal Questions of the Current Project of Creation of the Nuclear Optical Frequency Standard
AU  - Vitushkin, L. F.
AU  - Karpeshin, F. F.
AU  - Trzhaskovskaya, M. B.
PY  - 2019
T2  - Transactions of IAA RAS
IS  - 49
SP  - 9
AB  - There is nothing more practical than a good theory. The Trial-and-
Error path to the creation of a nuclear optical clock is analysed in
this article from the internal conversion theory point of view only.
The example of the $^{229}Th$ nuclide (which is considered to be the
most probable candidate for the role of the Nuclear Optical Frequency
Standard in future) shows that the interaction of the nucleus with
the external field of the laser cannot be considered without paying
attention at the properties of the electron shell. Thus, de-
excitation of the isomeric state of the 229Th nucleus cannot be
observed if the internal conversion is not taken into account.
Similarly, the direct laser excitation of the nucleus is an ambiguous
way of controlling its frequency. Our article analyses the most
common errors in the attempts to manipulate the nucleus without
taking into account the properties of the electron shell. Moreover,
the dependence of the nuclear properties on the electron shell may
cause variations of the isomeric line width in the thorium clock
depending on external conditions such as pressure and temperature.
DO  - 10.32876/ApplAstron.49.9-16
UR  - http://iaaras.ru/en/library/paper/1962/
ER  -