Observation of an unexpected negative isotope shift in 229Th+ and its theoretical explanation

  title={Observation of an unexpected negative isotope shift in 229Th+ and its theoretical explanation},
  author={M. V. Okhapkin and David M. Meier and Ekkehard Peik and Marianna S. Safronova and Mikhail G. Kozlov and Sergey G. Porsev},
  journal={Physical Review A},
We have measured the hyperfine structure and isotope shifts of the 402.0 nm and 399.6 nm resonance lines in 229Th+. These transitions could provide pathways towards the 229Th isomeric nuclear state excitation. An unexpected negative isotope shift relative to 232Th+ is observed for the 399.6 nm line, indicating a strong Coulomb coupling of the excited state to the nucleus. We have developed a new all-order approach to the isotope shift calculations that is generally applicable to heavy atoms and… 

Figures and Tables from this paper

Hyperfine interaction with the Th229 nucleus and its low-lying isomeric state
The thorium nucleus with 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 Charge Radii of ^{229}Th from Isotope and Isomer Shifts.
This work carries out isotope shift calculations in Th^{+} and Th^{2+} including the specific mass shift, using a combination of configuration interaction and all-order linearized coupled-cluster methods and estimates the uncertainty of this approach.
Electronic level structure of Th+ in the range of the Th229m isomer energy
Using resonant two-step laser excitation of trapped $^{232}\mathrm{Th}^+$ ions, we observe 166 previously unknown energy levels of even parity within the energy range from 7.8 to 9.8 eV and angular
Nuclear clocks for testing fundamental physics
The low-energy, long-lived isomer in 229Th, first studied in the 1970s as an exotic feature in nuclear physics, continues to inspire a multidisciplinary community of physicists. It has stimulated
A Unique System for Registering One‐Photon Signals in the Ultraviolet Range from An Isomeric 229mTh Nucleus Implanted on Thin SiO2/Si Films
Currently, an urgent task related to creating a nuclear frequency standard is the identification of a low‐lying nuclear state in the thorium‐229 isotope. Herein, a method for measuring the
The $$^{229}$$Th isomer: prospects for a nuclear optical clock
The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency
The History of \(^{229\mathrm {m}}\)Th
This chapter provides a complete review of theoretical and experimental investigations on \(^{229\text {m}}\)Th. It was a central aspect to also give a rather complete list of existing literature on


however (for it was the literal soul of the life of the Redeemer, John xv. io), is the peculiar token of fellowship with the Redeemer. That love to God (what is meant here is not God’s love to men)
Journal of Research of the National Bureau of Standards
[8] Newbold, R. F., Warren, W., Medcalf, A. S. C., and Amos, J., Nature 283, 596 (1980). [91 Eadie, J. S., Conrad, M., Toorchen, D., and Topal, M. D., Nature 308, 201 (1984). [101 Brennand, J., and
A new language, Opt, is proposed for writing these objective functions over image- or graph-structured unknowns concisely and at a high level and automatically transforms these specifications into state-of-the-art GPU solvers based on Gauss-Newton or Levenberg-Marquardt methods.
  • Bur. Stand., Sect. A 78, 163
  • 1974
  • Rev. A 54, 3948
  • 1996
A - Atomic Nuclei 334
  • 103-108
  • 1989
Lawrence Livermore National Laboratory
  • Internal Report No. LLNL-PROC-415170
  • 2009
  • A. Korol, http://www.qchem.pnpi. spb.ru/kozlovm/My_papers/notes/notes_on_is.pdf. (in russian)
  • 2005