μ-Mesonic Atom Studies of Ti, Fe, Cu, Zn, Tl, Pb, and Bi

Abstract
This paper presents the results of a precision re-evaluation of the μ-mesonic x-ray transition energies for Tl, Pb, Bi, Ti, Fe, Cu, and Zn. The 2p1s and 3d2p transition regions were studied for Tl, Pb, and Bi, and the 2p fine structure splitting was determined with good precision from both sets of measurements. The Tl, Pb, and Bi transition energies were determined to about 0.2%, while the 2p state fine structure splitting was determined to within 2 to 3%. The results are in good agreement with the theoretically predicted values of Ford and Wills, based on the charge distributions implied from the high-energy electron scattering experiments. An anomaly in the observed intensity ratio of the 2p121s to 2p321s transitions for Bi and Tl is discussed. It is believed to be due to an excitation of the first excited state of the initial nucleus. The observed 2p1s transition energies for Ti, Fe, Cu, and Zn are given, with experimental uncertainties of 0.2 to 0.3%. The comparison with the theoretically predicted values is much improved relative to the earlier experimental results.

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