Resonance conditions for 
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 isomer depletion via nuclear excitation by electron capture in a beam-based scenario

Polasik, M.; Słabkowska, K.; Carroll, J. J.; Chiara, C. J.; Syrocki, Ł.; Węder, E.; Rzadkiewicz, J.

doi:10.1103/physrevc.95.034312

Cited by 15 publications

(21 citation statements)

References 27 publications

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“…We consider in the following the case of 93m Mo for which recent claims have been made [40] on the first observation of NEEC following the proposals in Refs. [41,42].…”

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confidence: 99%

“…We consider in the following the case of 93m Mo for which recent claims have been made [40] on the first observation of NEEC following the proposals in Refs. [41,42].Free electrons in the plasma cover a broad energy range such that many NEEC resonance channels may contribute to the net NEEC rate λ neec . This can be expressed as the convolution over the electron energy E of the almost Dirac-delta-like NEEC single-resonance cross section σ neec and the free-electron flux φ e , summed over all charge states q and capture channels α d ,…”

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confidence: 99%

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Tailoring Laser-Generated Plasmas for Efficient Nuclear Excitation by Electron Capture

Gunst

Keitel

et al. 2018

Phys. Rev. Lett.

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The optimal parameters for nuclear excitation by electron capture in plasma environments generated by the interaction of ultra-strong optical lasers with solid matter are investigated theoretically. As a case study we consider a 4.85 keV nuclear transition starting from the long-lived 93m Mo isomer that can lead to the release of the stored 2.4 MeV excitation energy. We find that due to the complex plasma dynamics, the nuclear excitation rate and the actual number of excited nuclei do not reach their maximum at the same laser parameters. The nuclear excitation achievable with a high-power optical laser is up to twelve and up to six orders of magnitude larger than the values predicted for direct resonant and secondary plasma-mediated excitation at the x-ray free electron laser, respectively. Our results show that the experimental observation of the nuclear excitation of 93m Mo and the subsequent release of stored energy should be possible at laser facilities available today.Novel coherent light sources open unprecedented possibilities for the field of laser-matter interactions [1]. The X-ray Free Electron Laser (XFEL) [2,3] for instance can drive low-energy electromagnetic transitions in nuclei. Ultra-strong optical laser systems with up to few petawatt power [4][5][6][7][8] are very efficient in generating plasma environments [9], which host complex interactions between photons, electrons, ions and the atomic nucleus. Nuclear excitation in laser-generated hot plasmas involving optical lasers [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], or cold high-density plasmas [27] at the XFEL [28,29] have been under investigation. Special attention has been attracted by nuclear transitions starting from long-lived excited states. Such states are also known as nuclear isomers and are particularly interesting due to their potential to store large amounts of energy over long periods of time [30][31][32][33][34][35][36][37]. A typical example is 93m Mo at 2.4 MeV, for which an additional excitation of only 4.85 keV could lead to the depletion of the isomer and release on demand of the stored energy.For both optical-and x-ray laser-generated plasmas, the process of nuclear excitation by electron capture (NEEC) [38,39] into the atomic shell has proven to have a significant contribution. As secondary process in the cold plasma environment generated by the interaction of the XFEL with solid-state targets, NEEC can exceed the direct nuclear photoexcitation by six orders of magnitude [28,29] for the 4.85 keV excitation starting from the 93m Mo isomeric state. In this Letter, we show that by tailoring optical-laser-generated plasmas to harness maximum nuclear excitation via NEEC, a further six orders of magnitude increase in the nuclear excitation and subsequent isomer depletion compared to the case of cold XFEL-generated plasmas can be reached. As an interesting point, we find that due to the complexity of the processes involved, the plasma and correspondingly laser parameters for reaching the maximal NEEC ra...

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“…We consider in the following the case of 93m Mo for which recent claims have been made [40] on the first observation of NEEC following the proposals in Refs. [41,42].…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Tailoring Laser-Generated Plasmas for Efficient Nuclear Excitation by Electron Capture

Gunst

Keitel

et al. 2018

Phys. Rev. Lett.

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show abstract

“…It is worth noting that recently we have performed [10] an extensive study on the optimal conditions for the first experimental evidence of the NEEC process for the 93m Mo isomer using the beam-based approach proposed in Ref. [11].…”

Section: Introductionmentioning

confidence: 99%

“…In this approach, a long-lived 6.85 h 93m Mo isomer with spin parity 21/2 + (see Fig. 1) could be produced through a fusion-evaporation reaction in inverse kinematics, where a heavy projectile strikes a light target [10,11]. The NEEC process allows an excitation from the 93m Mo isomer (at 2425 keV) to a 17/2 + intermediate state (depletion level) with a half-life of 3.5 ns that lies only 4.85 keV higher in energy (see Fig.…”

Section: Introductionmentioning

confidence: 99%