Hyperfine interaction with the Th 229 nucleus and its low-lying isomeric state

verfasst von: Robert A. Müller, Anna V. Maiorova, Stephan Fritzsche, Andrey V. Volotka, Randolf Beerwerth, Przemyslaw Glowacki, Johannes Thielking, David Marcel Meier, Maksim Okhapkin, Ekkehard Peik, Andrey Surzhykov
Abstract: The thorium nucleus with a mass number A=229 has attracted much interest because its extremely low-lying first excited isomeric state at about 8 eV opens the possibility for the development of a nuclear clock. Both the energy of this state as well as the nuclear magnetic dipole and electric quadrupole moment of the Th229m isomer are subjects of intense research. The latter can be determined by investigating the hyperfine structure of thorium atoms or ions. Due to its electronic structure and the long lifetime of the nuclear isomeric state, Th2+ is especially suitable for such kinds of studies. In this Rapid Communication, we present a combined experimental and theoretical investigation of the hyperfine structure of the Th2+229 ion in the nuclear ground state, where a good agreement between theory and experiment is found. For the nuclear excited state we use our calculations in combination with recent measurements [J. Thielking et al., Nature (London) 556, 321 (2018)NATUAS0028-083610.1038/s41586-018-0011-8] to obtain the nuclear dipole moment of the isomeric state μiso=-0.35μN, which is in contradiction to the theoretically predicted value of μiso=-0.076μN [A. M. Dykhne and E. V. Tkalya, JETP Lett. 67, 251 (1998)JTPLA20021-364010.1134/1.567659].
Externe Organisation(en): Physikalisch-Technische Bundesanstalt (PTB)
Technische Universität Braunschweig
St. Petersburg State Polytechnical University
Helmholtz-Institut Jena
Friedrich-Schiller-Universität Jena
Poznan University of Technology
Typ: Artikel
Journal: Physical Review A
Band: 98
ISSN: 2469-9926
Publikationsdatum: 20.08.2018
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Atom- und Molekularphysik sowie Optik
Elektronische Version(en): https://doi.org/10.1103/PhysRevA.98.020503 (Zugang: Unbekannt)

BibTeX

@article{0216c3d9ddca454c99d2f18fec27b752,
title = "Hyperfine interaction with the Th 229 nucleus and its low-lying isomeric state",
abstract = "The thorium nucleus with a mass number A=229 has attracted much interest because its extremely low-lying first excited isomeric state at about 8 eV opens the possibility for the development of a nuclear clock. Both the energy of this state as well as the nuclear magnetic dipole and electric quadrupole moment of the Th229m isomer are subjects of intense research. The latter can be determined by investigating the hyperfine structure of thorium atoms or ions. Due to its electronic structure and the long lifetime of the nuclear isomeric state, Th2+ is especially suitable for such kinds of studies. In this Rapid Communication, we present a combined experimental and theoretical investigation of the hyperfine structure of the Th2+229 ion in the nuclear ground state, where a good agreement between theory and experiment is found. For the nuclear excited state we use our calculations in combination with recent measurements [J. Thielking et al., Nature (London) 556, 321 (2018)NATUAS0028-083610.1038/s41586-018-0011-8] to obtain the nuclear dipole moment of the isomeric state μiso=-0.35μN, which is in contradiction to the theoretically predicted value of μiso=-0.076μN [A. M. Dykhne and E. V. Tkalya, JETP Lett. 67, 251 (1998)JTPLA20021-364010.1134/1.567659].",
author = "M{\"u}ller, {Robert A.} and Maiorova, {Anna V.} and Stephan Fritzsche and Volotka, {Andrey V.} and Randolf Beerwerth and Przemyslaw Glowacki and Johannes Thielking and Meier, {David Marcel} and Maksim Okhapkin and Ekkehard Peik and Andrey Surzhykov",
note = "Funding information: Acknowledgments. R.A.M. and A.V.M. would like to thank Mikhail Kozlov for his support and many helpful discussions. R.A.M. acknowledges support by the RS-APS. A.V.M. acknowledges support by the Ministry of Education and Science of the Russian Federation (Grant No. 3.1463.2017/4.6) and by RFBR (Grant No. 17-02-00216). We thank Lars von der Wense, Benedikt Seiferle, and Peter Thirolf from LMU Munich for their contributions to joint experiments. We acknowledge financial support from the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No. 664732 (nuClock) and from DFG through CRC 1227 (DQ-mat, project B04).",
year = "2018",
month = aug,
day = "20",
doi = "10.1103/PhysRevA.98.020503",
language = "English",
volume = "98",
journal = "Physical Review A",
issn = "2469-9926",
publisher = "American Physical Society",
number = "2",
}