Few-Electron Highly Charged Muonic Ar Atoms Verified by Electronic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math> X Rays
A highly charged muonic ion is a unique few-body atomic system where a negatively charged muon and a few electrons are simultaneously bound to a single nucleus. We report the first state-selective observation of highly charged muonic Ar (μAr) by electronic K x-ray spectroscopy using an array of transition-edge sensor microcalorimeters. The high-precision K x-ray spectra provide a clear signature of the presence of muonic atoms with one, two, and three electrons, i.e., H-like, He-like, and Li-like μAr. With the aid of theoretical calculations, we confirmed that the peak positions are consistent with the x-ray energies from highly charged Cl ions, and the intensities reflect deexcitation dynamics of highly charged μAr.
Authors
- M. Katsuragawa (ORCID: https://orcid.org/0000-0001-8397-6882)
- Takuma Yamashita (ORCID: https://orcid.org/0000-0003-2225-2260)
- H. Tatsuno (ORCID: https://orcid.org/0000-0001-8682-1579)
- T. Isobe (ORCID: https://orcid.org/0000-0001-5163-030X)
- Hirofumi Noda (ORCID: https://orcid.org/0000-0001-6020-517X)
- T. Hashimoto (ORCID: https://orcid.org/0000-0001-6973-4895)
- K. Tőkési (ORCID: https://orcid.org/0000-0001-8772-8472)
- N. Kawamura (ORCID: https://orcid.org/0000-0002-3099-5526)
- Xiao‐Min Tong
- T. Sato (ORCID: https://orcid.org/0000-0002-4544-5463)
- Sakura-Nishino Takeda
- R. Hayakawa (ORCID: https://orcid.org/0000-0002-3752-0048)
- P. Strasser (ORCID: https://orcid.org/0000-0002-2370-2166)
- Yuichi Toyama (ORCID: https://orcid.org/0000-0002-3216-7396)
- Tadayuki Takahashi (ORCID: https://orcid.org/0000-0001-6305-3909)
- Soshi Takeshita (ORCID: https://orcid.org/0000-0002-4747-1980)
- D. A. Bennett (ORCID: https://orcid.org/0000-0003-3011-3690)
- Daniel S. Swetz (ORCID: https://orcid.org/0000-0002-8192-2175)
- M. Tampo (ORCID: https://orcid.org/0000-0002-5708-6795)
- W. B. Doriese (ORCID: https://orcid.org/0000-0003-1107-6441)
- K. Shimomura (ORCID: https://orcid.org/0000-0002-9501-6149)
- T. Azuma
- Nao Kominato (ORCID: https://orcid.org/0000-0001-8335-1057)
- Joel N. Ullom (ORCID: https://orcid.org/0000-0003-2486-4025)
- Joseph W. Fowler
- S. Kanda (ORCID: https://orcid.org/0000-0002-9080-4154)
- Yasuhiro Miyake (ORCID: https://orcid.org/0000-0003-0095-0447)
- S. Okada (ORCID: https://orcid.org/0000-0002-5349-8549)
- T. Okumura
- Yasushi Kino (ORCID: https://orcid.org/0000-0002-8359-9383)
- Daiji Kato
- G. C. O’Neil (ORCID: https://orcid.org/0000-0003-3450-2263)
- Kenichi Okutsu (ORCID: https://orcid.org/0000-0003-0713-4565)
- C. D. Reintsema (ORCID: https://orcid.org/0000-0001-8505-4638)
- Johnathon D. Gard (ORCID: https://orcid.org/0000-0003-4195-9544)
- D. R. Schmidt (ORCID: https://orcid.org/0000-0002-5764-0194)
- N. Paul (ORCID: https://orcid.org/0000-0003-4469-780X)
- P. Indelicato (ORCID: https://orcid.org/0000-0003-4668-8958)
- S. Yamada (ORCID: https://orcid.org/0000-0003-4808-893X)
- Yuto Ichinohe (ORCID: https://orcid.org/0000-0002-6102-1441)
- Shin Watanabe (ORCID: https://orcid.org/0000-0003-0441-7404)
- Kelsey M. Morgan (ORCID: https://orcid.org/0000-0002-6597-1030)
- M. S. Durkin
Institutions
- National Institute of Standards and Technology (US)
- Rikkyo University (JP)
- Kyushu University (JP)
- High Energy Accelerator Research Organization (JP)
- University of Tsukuba (JP)
- Meiji University (JP)
- Kavli Institute for the Physics and Mathematics of the Universe (JP)
- Chubu University (JP)
- HUN-REN Institute for Nuclear Research (HU)
- Tohoku University (JP)
- Japan Aerospace Exploration Agency (JP)
- Laboratoire Kastler Brossel (FR)
- University of Colorado System (US)
- National Institute for Fusion Science (JP)
- RIKEN (JP)
- National Institute of Standards (EG)
- RIKEN Nishina Center (JP)
- International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles
- Tokyo Metropolitan University (JP)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-06-16
- DOI
- https://doi.org/10.1103/physrevlett.134.243001
- Citations
- 3
- Primary Topic
- X-ray Spectroscopy and Fluorescence Analysis
- Type
- article
- Field-Weighted Citation Impact
- 5.65
Funders
- Materials and Life Science Experimental Facility
- University of Tsukuba
- Helmholtz Association
- Japan Society for the Promotion of Science
- National Institute for Fusion Science