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93mMo Isomer Depletion via Beam-Based Nuclear Excitation by Electron Capture

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Wu,  Yuanbin
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Keitel,  Christoph H.
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Pálffy,  Adriana
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Citation

Wu, Y., Keitel, C. H., & Pálffy, A. (2019). 93mMo Isomer Depletion via Beam-Based Nuclear Excitation by Electron Capture. Physical Review Letters, 122(21): 212501. doi:10.1103/PhysRevLett.122.212501.


Cite as: https://hdl.handle.net/21.11116/0000-0003-CBC2-D
Abstract
A recent nuclear physics experiment [C. J. Chiara et al., Nature (London) 554, 216 (2018)] reports the first direct observation of nuclear excitation by electron capture (NEEC) in the depletion of the 93mMo isomer. The experiment used a beam-based setup in which Mo highly charged ions with nuclei in the isomeric state 93mMo at 2.4 MeV excitation energy were slowed down in a solid-state target. In this process, nuclear excitation to a higher triggering level led to isomer depletion. The reported excitation probability Pexc=0.01 was solely attributed to the so-far unobserved process of NEEC in lack of a different known channel of comparable efficiency. In this work, we investigate theoretically the beam-based setup and calculate excitation rates via NEEC using state-of-the-art atomic structure and ion stopping-power models. For all scenarios, our results disagree with the experimental data by approximately 9 orders of magnitude. This stands in conflict with the conclusion that NEEC was the excitation mechanism behind the observed depletion rate.