Excitation and probing of low-energy nuclear states at high-energy storage rings

Abstract

${}^{229}$Th with a low-lying nuclear isomeric state is an essential candidate for a nuclear clock as well as many other applications. Laser excitation of the isomeric state has been a long-standing goal. With relativistic ${}^{229}$Th ions in storage rings, high-power lasers with wavelengths in the visible range or longer can be used to achieve high excitation rates of ${}^{229}$Th isomers. This can be realized through direct resonant excitation, or excitation via an intermediate nuclear or electronic state, facilitated by the tunability of both the laser-beam and ion-bunch parameters. Unique opportunities are offered by highly charged ${}^{229}$Th ions due to the nuclear-state mixing. The significantly reduced isomeric-state lifetime corresponds to a much higher excitation rate for direct resonant excitation. Importantly, we propose electric dipole transitions changing both the electronic and nuclear states that are opened by the nuclear hyperfine mixing. We suggest using them for efficient isomer excitation in Li-like ${}^{229}$Th ions, via stimulated Raman adiabatic passage or single-laser excitation. We also propose schemes for probing the isomers, utilizing nuclear radiative decay or laser spectroscopy on electronic transitions, through which the isomeric-state energy can be determined with an orders-of-magnitude higher precision than the current value. The schemes proposed here for ${}^{229}$Th could also be adapted to low-energy nuclear states in other nuclei, such as ${}^{229}$Pa.

arXiv comment20+7 pages, 12 figures

References in corpus (41)

• Stimulated Raman adiabatic passage in physics, chemistry and beyond
• Energy of the ${}^{229}$Th nuclear clock transition
• Laser spectroscopic characterization of the nuclear clock isomer ${}^{229m}$Th
• Wigner Crystals of 229Th for Optical Excitation of the Nuclear Isomer
• Nuclear quantum optics with x-ray laser pulses
• Measurement of the ${}^{229}$Th isomer energy with a magnetic micro-calorimeter
• All the Fun of the FAIR: Fundamental physics at the Facility for Antiproton and Ion Research
• X-ray pumping of the Th-229 nuclear clock isomer
• Measurement of the ${\beta }^{+}$ and orbital electron-capture decay rates in fully-ionized, hydrogen-like, and helium-like ${}^{140}$Pr ions
• Reduced transition probabilities for the gamma decay of the 7.8 eV isomer in ${}^{229}$Th
• Heavy-Ion Storage Rings and Their Use in Precision Experiments with Highly Charged Ions
• Nuclear Physics Experiments with Ion Storage Rings
• Effect of atomic electrons on 7.6 eV nuclear transition in ${}^{229}$Th${}^{3+}$
• High-resolution measurement of the time-modulated orbital electron capture and of the ${\beta }^{+}$ decay of hydrogen-like ${}^{142}$Pm${}^{60+}$ ions
• Observation of the hyperfine transition in lithium-like Bismuth ${}^{209}{\text{Bi}}^{80+}$: Towards a test of QED in strong magnetic fields
• First direct measurement of the intrinsic dipole moment in pear-shaped thorium isotopes
• Atomic physics studies at the Gamma Factory at CERN
• Isotope Harvesting at FRIB: Additional opportunities for scientific discovery
• Approaching the Gamow window with stored ions: Direct measurement of ${}^{124}$Xe(p,$\gamma$) in the ESR storage ring
• A laser excitation scheme for ${}^{229\text{m}}$Th
• Electronic bridge excitation in highly charged Th-229 ions
• Nuclear coherent population transfer with x-ray laser pulses
• On an attempt to optically excite the nuclear isomer in Th-229
• Magnetic dipole and electric quadrupole moments of the 229Th nucleus
• SPARC Collaboration: New Strategy for Storage Ring Physics at FAIR
• Expanding Nuclear Physics Horizons with the Gamma Factory
• Mass- and field-shift isotope parameters for the $2s-2p$ resonance doublet of lithium-like ions
• Concepts for direct frequency-comb spectroscopy of ${}^{229\text{m}}$Th and an internal-conversion-based solid-state nuclear clock
• Nuclear charge radii of ${}^{229}$Th from isotope and isomer shifts
• Energy levels of core-excited $1s2l2l^{\prime }$ states in lithium-like ions: argon to uranium
• Laser-induced electronic bridge for characterization of the ${}^{229\mathrm{m}}\mathrm{Th}\to {}^{229\mathrm{g}}\mathrm{Th}$ nuclear transition with a tunable optical laser
• Ground-state $g$ factor of highly charged ${}^{229}$Th ions: an access to the M1 transition probability between the isomeric and ground nuclear states
• Enhanced nuclear Schiff moment in stable and metastable nuclei
• New Test of Modulated Electron Capture Decay of Hydrogen-Like ${}^{142}$Pm Ions: Precision Measurement of Purely Exponential Decay
• High-luminosity Large Hadron Collider with laser-cooled isoscalar ion beams
• Nuclear coherent population transfer to the ${}^{229m}$Th isomer using x-ray pulses
• Magnetic hyperfine structure of the ground-state doublet in highly charged ions ${}^{229}$Th${}^{89+,87+}$ and the Bohr-Weisskopf effect
• A New Concept for Searching for Time-Reversal Symmetry Violation Using Pa-229 Ions Trapped in Optical Crystals
• Cooling rates and intensity limitations for laser-cooled ions at relativistic energies
• Local Lorentz invariance tests for photons and hadrons at the Gamma Factory
• Optical excitation of ultra-relativistic partially stripped ions

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