Hyperfine structure of μ-mesic atoms

Abstract

The effects of the distribution of nuclear magnetization on hyperfine structure (Bohr-Weisskopf effect) are studied in the case of μ-mesic atoms. The “configuration mixing” model of the nucleus is used for the calculation and it is shown that the reduction of hyperfine structure is of the order of 15% for Al 27 and of 50% for Bi 209. Calculations are also made in the framework of the collective model for Al 27 and for Ta 181. The vacuum polarization effects on hyperfine structure are studied and are found to be of the order of 1% for light nuclei.