Nuclear excitation by electronic transition of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts /><mml:none /><mml:mn>235</mml:mn></mml:mmultiscripts></mml:math>

Chodash, Perry; Burke, J. T.; Norman, E. B.; Wilks, S. C.; Casperson, R. J.; Fisher, S.; Holliday, Kiel; Jeffries, J. R.; Wakeling, M. A.

doi:10.1103/physrevc.93.034610

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…High-power optical laser systems with up to a few petawatt power are very efficient in generating plasma environments [3] that host complex interactions between photons, electrons, ions, and the atomic nucleus. Nuclear excitation in hot plasmas generated by optical lasers has been the subject of numerous works [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Also nuclear excitation in cold plasmas generated by XFELs [23] was shown to be relevant for a number of low-lying nuclear states [24,25].…”

Section: Introductionmentioning

confidence: 99%

X-ray-assisted nuclear excitation by electron capture in optical laser-generated plasmas

Wu¹,

Keitel²,

Pálffy³

2019

Phys. Rev. A

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X-ray assisted nuclear excitation by electron capture (NEEC) into inner-shell atomic holes in a plasma environment generated by strong optical lasers is investigated theoretically. The considered scenario involves the interaction of a strong optical laser with a solid-state nuclear target leading to the generation of a plasma. In addition, intense x-ray radiation from an X-ray Free Electron Laser (XFEL) produces inner-shell holes in the plasma ions, into which NEEC may occur. As case study we consider the 4.85-keV transition starting from the 2.4 MeV long-lived 93m Mo isomer that can be used to release the energy stored in this metastable nuclear state. We find that the recombination into 2p 1/2 inner-shell holes is most efficient in driving the nuclear transition. Already at few hundred eV plasma temperature, the generation of inner-shell holes can allow optimal conditions for NEEC, otherwise reached for steady-state plasma conditions in thermodynamical equilibrium only at few keV. The combination of x-ray and optical lasers presents two advantages: first, NEEC rates can be maximized at plasma temperatures where the photoexcitation rate remains low. Second, with mJclass optical lasers and an XFEL repetition rate of 10 kHz, the NEEC excitation number can reach ∼ 1 depleted isomer per second and is competitive with scenarios recently envisaged at petawattclass lasers.

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Section: Introductionmentioning

confidence: 99%

X-ray-assisted nuclear excitation by electron capture in optical laser-generated plasmas

Wu¹,

Keitel²,

Pálffy³

2019

Phys. Rev. A

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“…Also, the dependence of the NEEC timescale on T e is much weaker for the hydrodynamic expansion as determined by Eq. (17). For instance, for T e = 1 keV and T e = 7 keV at densities n e = 10 21 cm −3 , the lifetime τ p is given by 226 and 77 ps, respectively.…”

Section: Plasma Expansion: Lifetime Approach and Hydrodynamic Modelmentioning

confidence: 99%

“…Based on the expression of the plasma lifetime τ p in Eq. (17), the total number of excited nuclei in the plasma can be estimated. This approximative approach is easily applicable to other nuclear transitions and provides many instructive insights to plasma-mediated nuclear excitations as shown later on considering the example of 93m Mo triggering.…”

Section: General Model For Spherical Plasmasmentioning

confidence: 99%

“…On the other hand, high-power optical lasers with their tremendous efficiency in transferring kinetic energy to charged particles may cause formation of plasma [4], the host of complex interactions between photons, electrons, ions and the atomic nucleus. Nuclear excitation in optical laser-generated plasmas has been the general subject of several studies so far [5][6][7][8][9][10][11][12][13][14][15][16][17][18], while the possibilities to induce nuclear transitions to low-lying excited levels using high-energy lasers have been summarized in Refs. [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Nuclear excitation by electron capture in optical-laser-generated plasmas

Gunst

Keitel

et al. 2018

Phys. Rev. E

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The process of nuclear excitation by electron capture in plasma environments generated by the interaction of ultrastrong optical lasers with solid-state samples is investigated theoretically. With the help of a plasma model, we perform a comprehensive study of the optimal parameters for the most efficient nuclear excitation and determine the corresponding laser setup requirements. We discern between the low-density plasma regime, modeled by scaling laws, and the high-density regime, for which we perform particle-in-cell calculations. As a nuclear transition case study we consider the 4.85-keV nuclear excitation starting from the long-lived ^{93m}Mo isomer. Our results show that the optimal plasma and laser parameters are sensitive to the chosen observable and that measurable rates of nuclear excitation and isomer depletion of ^{93m}Mo should be already achievable at laser facilities existing today.

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“…Further studies of the nuclear excitation mechanisms by atomic transition enable us not only to better understand the interactions between the nucleus and electrons and to determine nuclear parameters, but also opens perspectives to a variety of fascinating applications. One among them is the access to low-lying isomeric nuclear excitations, e.g., the isomeric states 229m Th [12-14] and 235m U [15] with an excitation energy of several (tens) eV. Other potential applications can be seen in the isotope separation [5], energy storage [16] and its controlled release [17,18].…”

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confidence: 99%

Nuclear Excitation by Two-Photon Electron Transition

et al. 2016

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A new mechanism of nuclear excitation via two-photon electron transitions (NETP) is proposed and studied theoretically. As a generic example, detailed calculations are performed for the E1E1 1s2s^{1}S_{0}→1s^{2}^{1}S_{0} two-photon decay of a He-like ^{225}Ac^{87+} ion with a resonant excitation of the 3/2+ nuclear state with an energy of 40.09(5) keV. The probability for such a two-photon decay via the nuclear excitation is found to be P_{NETP}=3.5×10^{-9} and, thus, is comparable with other mechanisms, such as nuclear excitation by electron transition and by electron capture. The possibility for the experimental observation of the proposed mechanism is thoroughly discussed.

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Nuclear excitation by electronic transition ofU235

Cited by 6 publications

References 24 publications

X-ray-assisted nuclear excitation by electron capture in optical laser-generated plasmas

X-ray-assisted nuclear excitation by electron capture in optical laser-generated plasmas

Nuclear excitation by electron capture in optical-laser-generated plasmas

Nuclear Excitation by Two-Photon Electron Transition

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