P, T -Violating and magnetic hyperfine interactions in atomic thallium

Abstract

We present state-of-the-art string-based relativistic general-excitation-rank configuration interaction and coupled cluster calculations of the electron electric dipole moment, the nucleon-electron scalar-pseudoscalar, and the magnetic hyperfine interaction constants (αde' αCS' A∥, respectively) for the thallium atomic ground state 2P1/2. Our present best values are αde = -558 ± 28, αCS = 6.77 ± 0.34 [10-18e cm], and A∥ = 21172 ± 1059 [MHz]. The central value of the latter constant agrees with the experimental result to within 0.7% and serves as a measurable probe of the P, T -violating interaction constants. Our findings lead to a significant reduction of the theoretical uncertainties for P, T -odd interaction constants for atomic thallium but not to stronger constraints on the electron electric dipole moment, de, or the nucleon-electron scalar-pseudoscalar coupling constant, CS.