High-resolution X-ray spectroscopy of the highly charged muonic atoms/ions isolated in vacuum is an ideal probe to explore quantum electrodynamics under extremely strong electric fields, which is one of the major topic in fundamental atomic physics. A feasibility test measurement with a low-density neon gas target was performed by observing X-rays emitted by muonic neon via the \(5 \rightarrow 4\) transition, \(\sim\) 6.3 keV, using a multi-pixel array of superconducting transition-edge-sensor (TES) microcalorimeters at the J-PARC muon facility. We successfully demonstrated the feasibility of muonic atom X-ray spectroscopy with a gas target at a pressure as low as 0.1 atom using TES array under an intense pulsed muon beam.
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This work was partly supported by the Grants-in-Aid for Scientific Research (KAKENHI) from MEXT and JSPS (No. 18H05458). The authors are grateful to the members in the NIST Quantum Sensors Project. We appreciate the significant contributions by J-PARC, KEK, RIKEN, and those who have backed up the J-PARC MLF 2019A0083 experiment.
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Okada, S., Azuma, T., Bennett, D.A. et al. X-ray Spectroscopy of Muonic Atoms Isolated in Vacuum with Transition Edge Sensors. J Low Temp Phys (2020). https://doi.org/10.1007/s10909-020-02476-5
- Transition-edge sensor
- X-ray spectroscopy
- Muonic atom