Physics – Atomic Physics
Scientific paper
2000-05-15
Phys.Rev.A62:052101,2000
Physics
Atomic Physics
13 pages, 4 figures, LaTeX, Submitted to Phys. Rev. A
Scientific paper
10.1103/PhysRevA.62.052101
We have performed relativistic many-body calculations of the hyperfine interaction in the $6s$ and $7s$ states of Cs, including the off-diagonal matrix element. The calculations were used to determine the accuracy of the semi-empirical formula for the electromagnetic transition amplitude $<6s|M1|7s>$ induced by the hyperfine interaction. We have found that even though the contribution of the many-body effects into the matrix elements is very large, the square root formula $<6s|H_{hfs}|7s > = \sqrt{< 6s|H_{hfs}|6s > < 7s|H_{hfs}|7s >}$ remains valid to the accuracy of a fraction of $10^{-3}$. The result for the M1-amplitude is used in the interpretation of the parity-violation measurement in the $6s-7s$ transition in Cs which claims a possible deviation from the Standard model.
Dzuba V. A.
Flambaum Victor V.
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