Role of Autoionization States in Nuclear Excitation and Triggering by an Electron Transition (NEET)

Izosimov, I. N.

doi:10.1080/00223131.2008.10875967

Cited by 6 publications

(2 citation statements)

References 26 publications

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“…Regarding the field of quantum optics and quantum computing, a nuclear isomeric state that could be directly interrogated by laser light also could serve as a dedicated qubit with extraordinary features. Finally, the isotope 229 Th is most likely a suitable candidate for NEET (Nuclear Excitation by Electron Transition), a process, which could help in pumping the isomeric state from the ground state [13].…”

Section: Introductionmentioning

confidence: 99%

Resonance ionization spectroscopy of thorium isotopes–towards a laser spectroscopic identification of the low-lying 7.6 eV isomer of²²⁹Th

Raeder

Sonnenschein

Gottwald

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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In-source resonance ionization spectroscopy was used to identify an efficient and selective three step excitation/ionization scheme of thorium, suitable for titanium:sapphire (Ti:sa) lasers. The measurements were carried out in preparation of laser spectroscopic investigations for an identification of the low-lying 229 m Th isomer predicted at 7.6 ± 0.5 eV above the nuclear ground state. Using a sample of 232 Th, a multitude of optical transitions leading to over 20 previously unknown intermediate states of even parity as well as numerous high-lying odd parity auto-ionizing states were identified. Level energies were determined with an accuracy of 0.06 cm −1 for intermediate and 0.15 cm −1 for auto-ionizing states. Using different excitation pathways an assignment of total angular momenta for several energy levels was possible. One particularly efficient ionization scheme of thorium, exhibiting saturation in all three optical transitions, was studied in detail. For all three levels in this scheme, the isotope shifts of the isotopes 228 Th, 229 Th, and 230 Th relative to 232 Th were measured. An overall efficiency including ionization, transport and detection of 0.6 % was determined, which was predominantly limited by the transmission of the mass spectrometer ion optics.

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Section: Introductionmentioning

confidence: 99%

Resonance ionization spectroscopy of thorium isotopes–towards a laser spectroscopic identification of the low-lying 7.6 eV isomer of²²⁹Th

Raeder

Sonnenschein

Gottwald

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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“…This approach would provide unique opportunities for fundamental research on laser-optical atomto-nucleus coupling and could pave the way for the potential use of the 229m Th isomer as a nuclear time standard of highest precision [5,6]. Further proposals suggest the application of the isomer as a qubit for quantum computing [5], as a stepping stone towards a γ -ray laser [4], as a system in which tests of the effect of the chemical environment on nuclear decay rates can be studied [7], or for investigations on nuclear excitation by electron transition [8], a process which could help in populating the isomeric state from the ground state.…”

Section: Introductionmentioning

confidence: 99%

Determination of the ground-state hyperfine structure in neutral²²⁹Th

Sonnenschein¹,

Raeder²,

Hakimi³

et al. 2012

J. Phys. B: At. Mol. Opt. Phys.

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The ground-state hyperfine structure of neutral 229Th has been measured for the first time using high-resolution resonance ionization spectroscopy. The measurements were performed as a preparatory work aimed at the identification of the predicted low-lying 7.6 eV isomer in 229Th through an investigation of its hyperfine structure. The hyperfine coupling constants have been extracted for the atomic ground state as well as for three excited states at 26 096, 26 113 and 38 278 cm−1. Due to rather small splittings not all hyperfine components were completely resolved and therefore an extensive χ2-error analysis was performed to achieve reliable results. The ground-state transition to the excited state at 38 278 cm−1 was identified to be the most sensitive of the three transitions with regard to the future identification of the isomeric state.

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Simulation of nuclear isomer production in laser-induced plasma

Ma,

Wang,

Yang

et al. 2024

Matter and Radiation at Extremes

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Nuclear isomers play essential roles in various fields, including stellar nucleosynthesis, nuclear clocks, nuclear batteries, clean nuclear energy, and γ-ray lasers. Recent technological advances in high-intensity lasers have made it possible to excite or de-excite nuclear isomers using table-top laser equipment. Utilizing a particle-in-cell code, we investigate the interaction of a laser with a nanowire array and calculate the production rates of the 73mGe (E1 = 13.3 keV) and 107mAg (E1 = 93.1 keV) isomers. For 73m1Ge, production by Coulomb excitation is found to contribute a peak efficiency of 1.0 × 1019 particles s−1 J−1, while nuclear excitation by electron capture (NEEC) contributes a peak of 1.65 × 1011 particles s−1 J−1. These results indicate a high isomeric production ratio, as well as demonstrating the potential for confirming the existence of NEEC, a long-expected but so far experimentally unobserved fundamental process.

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Role of Autoionization States in Nuclear Excitation and Triggering by an Electron Transition (NEET)

Cited by 6 publications

References 26 publications

Resonance ionization spectroscopy of thorium isotopes–towards a laser spectroscopic identification of the low-lying 7.6 eV isomer of²²⁹Th

Resonance ionization spectroscopy of thorium isotopes–towards a laser spectroscopic identification of the low-lying 7.6 eV isomer of²²⁹Th

Determination of the ground-state hyperfine structure in neutral²²⁹Th

Simulation of nuclear isomer production in laser-induced plasma

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Role of Autoionization States in Nuclear Excitation and Triggering by an Electron Transition (NEET)

Cited by 6 publications

References 26 publications

Resonance ionization spectroscopy of thorium isotopes–towards a laser spectroscopic identification of the low-lying 7.6 eV isomer of229Th

Resonance ionization spectroscopy of thorium isotopes–towards a laser spectroscopic identification of the low-lying 7.6 eV isomer of229Th

Determination of the ground-state hyperfine structure in neutral229Th

Simulation of nuclear isomer production in laser-induced plasma

Contact Info

Product

Resources

About

Resonance ionization spectroscopy of thorium isotopes–towards a laser spectroscopic identification of the low-lying 7.6 eV isomer of²²⁹Th

Resonance ionization spectroscopy of thorium isotopes–towards a laser spectroscopic identification of the low-lying 7.6 eV isomer of²²⁹Th

Determination of the ground-state hyperfine structure in neutral²²⁹Th