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Deexcitation Dynamics of Muonic Atoms Revealed by High-Precision Spectroscopy of Electronic K X Rays

T. Okumura et al.
Phys. Rev. Lett. 127, 053001 – Published 27 July 2021
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Abstract

We observed electronic K x rays emitted from muonic iron atoms using superconducting transition-edge sensor microcalorimeters. The energy resolution of 5.2 eV in FWHM allowed us to observe the asymmetric broad profile of the electronic characteristic Kα and Kβ x rays together with the hypersatellite Khα x rays around 6 keV. This signature reflects the time-dependent screening of the nuclear charge by the negative muon and the L-shell electrons, accompanied by electron side feeding. Assisted by a simulation, these data clearly reveal the electronic K- and L-shell hole production and their temporal evolution on the 10–20 fs scale during the muon cascade process.

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  • Received 12 February 2021
  • Accepted 11 June 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.053001

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

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Vol. 127, Iss. 5 — 30 July 2021

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