Few-electron highly charged muonic Ar atoms verified by electronic $K$ x rays
Abstract
Electronic x rays emitted by muonic Ar atoms in the gas phase were observed using a superconducting transition-edge-sensor microcalorimeter. The high-precision energy spectra provided a clear signature of the presence of muonic atoms accompanied by a few electrons, which have never been observed before. One-, two-, and three-electron bound, i.e., H-like, He-like, and Li-like, muonic Ar atoms were identified from electronic x rays and hyper-satellite x rays. These x rays are emitted after the charge transfer process by the collisions with surrounding Ar atoms. 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 reflecting deexcitation dynamics were successfully understood by taking into account the interaction between the muon and bound electrons.
Keywords
Cite
@article{arxiv.2407.07977,
title = {Few-electron highly charged muonic Ar atoms verified by electronic $K$ x rays},
author = {T. Okumura and T. Azuma and D. A. Bennett and W. B. Doriese and M. S. Durkin and J. W. Fowler and J. D. Gard and T. Hashimoto and R. Hayakawa and Y. Ichinohe and P. Indelicato and T. Isobe and S. Kanda and D. Kato and M. Katsuragawa and N. Kawamura and Y. Kino and N. Kominato and Y. Miyake and K. M. Morgan and H. Noda and G. C. O'Neil and S. Okada and K. Okutsu and N. Paul and C. D. Reintsema and T. Sato and D. R. Schmidt and K. Shimomura and P. Strasser and D. S. Swetz and T. Takahashi and S. Takeda and S. Takeshita and M. Tampo and H. Tatsuno and K. Tőkési and X. M. Tong and Y. Toyama and J. N. Ullom and S. Watanabe and S. Yamada and T. Yamashita},
journal= {arXiv preprint arXiv:2407.07977},
year = {2024}
}