Abstract
Negative muon spin precession experiments by Yamazaki et al. have found giant hyperfine anomalies in muonic atoms ranging from a few percent up to 36%. In order to understand their results, we present Breit interaction calculations based on atomic self-consistent unrestricted Dirac-Fock solutions which explicitly include all electrons and the negative muon. The Breit interaction results (including the relativistic correction for the bound muong-factor), vary from near zero forμ −O/N to −5% forμ −Pd/Rh; this latter is much larger than the calculated muonic or nuclear Bohr-Weisskopf anomalies and much smaller than the 36% measured value. Forμ }Ni/Co we find a calculated range of results (depending on assumed electronic configurations) of −2.3 to −2.7% in excellent agreement with recent measurements of the Yamazaki group. This excellent agreement inμ }Ni/Co provides strong support for the earlier suggestions that the discrepancy in the case ofμ −Pd/Rh is due to experimental factors.
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This work was supported by the U.S. National Science Foundation (DMR Grant No. 82-16543) and the U.S. Department of Energy.
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Freeman, A.J., Mallow, J.V., Desclaux, J.P. et al. Theory of hyperfine anomalies in muonic atoms. Hyperfine Interact 19, 865–872 (1984). https://doi.org/10.1007/BF02066131
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DOI: https://doi.org/10.1007/BF02066131