Deexcitation Dynamics of Muonic Atoms Revealed by High-Precision Spectroscopy of Electronic K X rays
- Okumura, T.
- Azuma, T.
- Bennett, D.A.
- Caradonna, P.
- Chiu, I.
- Doriese, W.B.
- Durkin, M.S.
- Fowler, J.W.
- Gard, J.D.
- Hashimoto, T.
- Hayakawa, R.
- Hilton, G.C.
- Ichinohe, Y.
- Indelicato, P.
- Isobe, T.
- Kanda, S.
- Kato, D.
- Katsuragawa, M.
- Kawamura, N.
- Kino, Y.
- Kubo, M.K.
- Mine, K.
- Miyake, Y.
- Morgan, K.M.
- Ninomiya, K.
- Noda, H.
- O'Neil, G.C.
- Okada, S.
- Okutsu, K.
- Osawa, T.
- Paul, N.
- Reintsema, C.D.
- Schmidt, D.R.
- Shimomura, K.
- Strasser, P.
- Suda, H.
- Swetz, D.S.
- Takahashi, T.
- Takeda, S.
- Takeshita, S.
- Tampo, M.
- Tatsuno, H.
- Tong, X.M.
- Ueno, Y.
- Ullom, J.N.
- Watanabe, S.
- Yamada, S.
Publication date
January 2021
DOI Publisher
American Physical Society (APS)Abstract
International audienceWe 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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