Nuclear isomer excitation in 
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 atoms by superintense laser fields

Andreev, A. V.; Savel’ev, A. B.; Stremoukhov, S. Yu.; Shoutova, O. A.

doi:10.1103/physreva.99.013422

Cited by 16 publications

(11 citation statements)

References 30 publications

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“…The existence of long-lived excited (metastable) states of atomic nuclei, known as nuclear isomers, was proposed by Soddy (1917) and verified by Hahn (1921) a century ago (Walker & Podolyák 2020). The study of nuclear isomers has since been a focus of experimental efforts throughout the chart of nuclides, often requiring challenging measurements (Raut et al 2013;Watanabe et al 2014;Simpson et al 2014;Patel et al 2014;Svirikhin et al 2017;Andreev et al 2019;Sikorsky et al 2020). Over 700 nuclei have been identified as possessing isomeric states with half-lives greater than 100 µs (Brown et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Astromers in the radioactive decay of r-process nuclei

Misch,

Sprouse,

Mumpower

2020

Preprint

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We study the impact of astrophysically relevant nuclear isomers (astromers) in the context of the rapid neutron capture process (r-process) nucleosynthesis. We compute thermally mediated transition rates between long-lived isomers and the corresponding ground states in neutron-rich nuclei. We calculate the temperature-dependent β-decay feeding factors which represent the fraction of material going to each of the isomer and ground state daughter species from the β-decay parent species. We simulate nucleosynthesis by including as separate species nuclear excited states with measured terrestrial half-lives greater than 100 µs. We find a variety of isomers throughout the chart of nuclides are populated, and we identify those most likely to be influential. We comment on the capacity of isomer production to alter radioactive heating in an r-process environment.

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Section: Introductionmentioning

confidence: 99%

Astromers in the radioactive decay of r-process nuclei

Misch,

Sprouse,

Mumpower

2020

Preprint

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“…The excited state was inferred to possess spin, parity and Nilsson quantum numbers 3/2 + [631], whereas the nuclear ground-state has quantum numbers 5/2 + [633] (For the nuclear structure model, the interested reader is referred to [244,400]). The isomer-to-ground-state 7.84 ± 0.29 eV (4) 158…”

Section: The Special Properties Of 229m Thmentioning

confidence: 99%

“…(3) Reevaluation of the measurement of [12,13] using the branching ratio obtained in [214]. (4) Based on the asymmetry of the 29.19 keV doublet. (5) Based on the double-difference technique like in [12,13].…”

Section: The Special Properties Of 229m Thmentioning

confidence: 99%

“…High harmonics are generated in a noble-gas jet, with the 7th harmonic matching the expected energy of the nuclear transition. An out-coupled power of 5 nW per comb mode in the 7th harmonic at about 150 nm has already been generated in this way [418] 4 . Laser excitation rates are discussed in Appendix A.1.2 and the nuclear population density can be calculated based on Eq.…”

Section: Laser Systems For Nuclear Clock Developmentmentioning

confidence: 99%

“…This is in agreement with the result from [45] for the case that the bandwidth of the laser light dominates both decoherences, e.g., Γ (Γ n , Γ a , Γ c ). In 2019 a process of "nonlinear laser nuclear excitation" was proposed by Andreev et al [4] (see also [5]). In this process the atomic shell is used to generate high harmonics from short laser pulses.…”

Section: A33 Nuclear Excitation By Electron Capturementioning

confidence: 99%

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The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Wense

2020

Eur. Phys. J. A

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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 uncertainty of about $$10^{-19}$$ 10 - 19 has rendered a nuclear clock an interesting tool for many applications, potentially even for a re-definition of the second. The focus of the corresponding research is a nuclear transition of the $$^{229}$$ 229 Th nucleus, which possesses a uniquely low nuclear excitation energy of only $$8.12\pm 0.11$$ 8.12 ± 0.11 eV ($$152.7\pm 2.1$$ 152.7 ± 2.1 nm). This energy is sufficiently low to allow for nuclear laser spectroscopy, an inherent requirement for a nuclear clock. Recently, some significant progress toward the development of a nuclear frequency standard has been made and by today there is no doubt that a nuclear clock will become reality, most likely not even in the too far future. Here we present a comprehensive review of the current status of nuclear clock development with the objective of providing a rather complete list of literature related to the topic, which could serve as a reference for future investigations.

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Toward the possibility of ²²⁹Th isomeric nuclear state excitation by two-color laser field

et al. 2019

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The process of high harmonic generation (HHG) has a wide area of different applications, in particular, in nanoscale imaging, study the nanoscale energy transport in complex molecules and solids, probe the charge and spin dynamics with the femtosecond time resolution, etc. Here we discuss a possible application of HHG effect related with the study of nuclear transition dynamics. We analyse the efficiency of excitation of the isomeric nuclear state 229m Th by the fifth harmonic of Ti: Sa laser generated in thorium by two-color femtosecond pulse consisting of the fundamental and thensecond harmonic of Ti: Sa laser (ω+2ω). It is shown that the rate of isomeric state excitation can be enhanced significantly with respect to other nucleus excitation processes in laser plasma or by an external coherent source at the resonance wavelength. This enhancement is due to the discussing process of "nonlinear laser nuclear excitation".

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Nuclear isomer excitation in Th229 atoms by superintense laser fields

Cited by 16 publications

References 30 publications

Astromers in the radioactive decay of r-process nuclei

Astromers in the radioactive decay of r-process nuclei

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Toward the possibility of ²²⁹Th isomeric nuclear state excitation by two-color laser field

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Nuclear isomer excitation in Th229 atoms by superintense laser fields

Cited by 16 publications

References 30 publications

Astromers in the radioactive decay of r-process nuclei

Astromers in the radioactive decay of r-process nuclei

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Toward the possibility of 229Th isomeric nuclear state excitation by two-color laser field

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Toward the possibility of ²²⁹Th isomeric nuclear state excitation by two-color laser field