Abstract
Hyperfine-structure measurements by optical detection of Zeeman-level crossings in the state were made with natural-linewidth precision in three radioactive isotopes of mercury. The magnetic dipole () and electric quadrupole () interaction constants in Mc/sec implied by these measurements (without second-order hyperfine corrections, but including second-order Zeeman and cross-Zeeman hyperfine corrections) are: (9.5-h half-life) (isomer, 40 h) (isomer, 11 h) The factor for the state of is obtained from a new level-crossing measurement. The value, including second-order Zeeman and Zeeman-hyperfine corrections, is ; 37× of this is the total contribution from and the second-order corrections. Our value is in substantial agreement with a recent measurement in the even Hg isotopes. The measured ratio of the factors of and with all second-order corrections (resulting from interaction with neighboring fine-structure levels) included is combined with the value for the ratio of the magnetic moments in an external field obtained by Walter and Stavn to yield the Bohr-Weisskopf hfs anomaly between and , which is calculated to be . The contribution to the anomaly from the electron is extracted and used to estimate admixture coefficients in the single-particle model of the nucleus with configuration mixing. These turn out to be satisfactorily small for the configurations assumed.
- Received 6 April 1964
DOI:https://doi.org/10.1103/PhysRev.137.A330
©1965 American Physical Society