X-ray pumping of the 229Th nuclear clock isomer

  title={X-ray pumping of the 229Th nuclear clock isomer},
  author={Takahiko Masuda and Akihiro Yoshimi and Akira Fujieda and Hiroyuki Fujimoto and H Haba and Hideaki Hara and Takahiro Hiraki and Hiroyuki Kaino and Yoshitaka Kasamatsu and Shinji Kitao and Kenji Konashi and Yuki Miyamoto and Koichi Okai and Sho Okubo and Noboru Sasao and Makoto Seto and Thorsten Schumm and Yudai Shigekawa and Kenta Suzuki and Simon Stellmer and Kenji Tamasaku and Satoshi Uetake and Makoto Watanabe and Tsukasa Watanabe and Yuki Yasuda and A. Yamaguchi and Yoshitaka Yoda and Takuya Yokokita and Motohiko Yoshimura and Koji Yoshimura},
The metastable first excited state of thorium-229, 229mTh, is just a few electronvolts above the nuclear ground state1–4 and is accessible by vacuum ultraviolet lasers. The ability to manipulate the 229Th nuclear states with the precision of atomic laser spectroscopy5 opens up several prospects6, from studies of fundamental interactions in physics7,8 to applications such as a compact and robust nuclear clock5,9,10. However, direct optical excitation of the isomer and its radiative decay to the… Expand
Energy of the 229Th nuclear clock transition
The method combines nuclear and atomic physics measurements to advance precision metrology, and the findings are expected to facilitate the application of high-resolution laser spectroscopy on nuclei and to enable the development of a nuclear optical clock of unprecedented accuracy. Expand
The thorium-229 low-energy isomer and the nuclear clock
The 229Th nucleus has an isomeric state at an energy of about 8 eV above the ground state, several orders of magnitude lower than typical nuclear excitation energies. This has inspired theExpand
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 stimulatedExpand
Energy of the ^{229}Th Nuclear Clock Isomer Determined by Absolute γ-ray Energy Difference.
The low-lying isomeric state of ^{229}Th provides unique opportunities for high-resolution laser spectroscopy of the atomic nucleus and is determined by taking the absolute energy difference between the excitation energy required to populate the 29.2-keV state and the energy emitted in its decay to the isomersic excited state. Expand
229DFT calculation of Thorium-doped Magnesium Fluoride for Nuclear Laser Spectroscopy.
Using the Vienna Ab-initio Simulation Package (VASP), density functional theory (DFT) calculations of the electronic and optical properties of Th:MgF2 determine whether Thorium will be accepted as a dopant and identify the charge compensation mechanism and geometry, and indicate, that the band gap of Th-doped M gF2 will be significantly reduced compared to undoped Mgf2, below the expected229Th isomer energy. Expand
Concepts for direct frequency-comb spectroscopy of 229mTh and an internal-conversion-based solid-state nuclear clock
A new concept for narrow-band direct nuclear laser spectroscopy of 229m Th is proposed, using a single comb mode of a vacuum ultraviolet frequency comb generated from the 7th harmonic of an Yb-dopedExpand
Recent progress in laser spectroscopy of the actinides
The interest to perform laser spectroscopy in the heaviest elements arises from the strong impact of relativistic effects, electron correlations and quantum electrodynamics on their atomic structure.Expand
Estimation of radiative half-life of Th229m by half-life measurement of other nuclear excited states in Th229
We perform coincidence measurements between α particles and γ rays from a U source to determine the half-lives of the excited state in a Th nucleus. We first prove that the half-lives of 42.43andExpand
Electronic Bridge Excitation in Highly Charged ^{229}Th Ions.
It is shown how to implement a promising electronic bridge scheme in an electron beam ion trap starting from a metastable electronic state to efficiently drive the nuclear transition by coupling it to the electronic shell. Expand
Development of a recoil ion source providing slow Th ions including 229(m)Th in a broad charge state distribution
Ions of the isomer $^{229m}$Th are a topic of high interest for the construction of a "nuclear clock" and in the field of fundamental physics for testing symmetries of nature. They can be efficientlyExpand


Energy of the 229Th nuclear clock transition
The method combines nuclear and atomic physics measurements to advance precision metrology, and the findings are expected to facilitate the application of high-resolution laser spectroscopy on nuclei and to enable the development of a nuclear optical clock of unprecedented accuracy. Expand
Laser spectroscopic characterization of the nuclear-clock isomer 229mTh
The laser spectroscopic investigation of the hyperfine structure of the doubly charged 229mTh ion and the determination of the fundamental nuclear properties of the isomer, namely, its magnetic dipole and electric quadrupole moments, as well as its nuclear charge radius are presented. Expand
Lifetime Measurement of the ^{229}Th Nuclear Isomer.
The measurement of the internal-conversion decay half-life of neutral ^{229m}Th has been measured, which is in the range of theoretical predictions and gives further support for an internal conversion coefficient of ≈10^{9}, thus constraining the strength of a radiative branch in the presence of internal conversion. Expand
Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter☆
  • G. Kazakov, V. Schauer, +7 authors T. Schumm
  • Medicine, Physics
  • Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
  • 2014
It is studied, how state-of-the-art magnetic metallic microcalorimeters with an energy resolution down to a few eV can be used to measure the isomer energy of Thorium-229 and the dependence of the attainable precision of the energy measurement on the signal and background count rates and the instrumental resolution. Expand
Performance of a 229 Thorium solid-state nuclear clock
The 7.8 eV nuclear isomer transition in 229thorium has been suggested as a clock transition in a new type of optical frequency standard. Here we discuss the construction of a ‘solid-state nuclearExpand
Nuclear laser spectroscopy of the 3.5 eV transition in Th-229
We propose high-resolution laser spectroscopy of the 3.5 eV nuclear transition in Th-229 in isolated atoms. Laser excitation of the nucleus can be detected efficiently in a double-resonance method byExpand
Nuclear resonant scattering experiment with fast time response: Photonuclear excitation of 201 Hg
Nuclear resonant excitation of the 29.19-keV level in $^{229}$Th with high-brilliance synchrotron- radiation and detection of its decay signal, are proposed with the aim of populating the extremelyExpand
Direct detection of the 229Th nuclear clock transition
The direct detection of this nuclear state of 229mTh is reported, which is further confirmation of the existence of the isomer and lays the foundation for precise studies of its decay parameters. Expand
Energy splitting of the ground-state doublet in the nucleus 229Th.
The energy splitting of the 229Th ground-state doublet is measured to be 7.6+/-0.5 eV, significantly greater than earlier measurements. Gamma rays produced following the alpha decay of 233U (105Expand
Nuclear clocks based on resonant excitation of γ-transitions
Abstract We review the ideas and concepts for a clock that is based on a radiative transition in the nucleus rather than in the electron shell. This type of clock offers advantages like anExpand