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Title: A self-consistent treatment of the parity non-conserving interaction in atoms
Author: Plummer, Edmund
ISNI:       0000 0001 3493 0087
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 1984
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The Weinberg-Salam model of the weak interaction predicts that any wavefunction contains a small admixture of functions of the opposite parity. As a result, radiative transitions which would have pure magnetic dipole (M1) character in the absence of weak parity mixing interactions acquire a small component of electric dipole (E1) character, implying that atoms will show weak optical activity in proportion to the ratio of the matrix elements R = E1/M1. This work describes a generalization of the MCDF procedure to include the weak interaction. This allows us to treat correlation, exchange, orthogonality and shielding in a consistent and rigorous manner. A pilot calculation on bismuth using a model potential highlighted numerical problems associated with the use of a uniform nuclear density distribution. Therefore we have used a Fermi distribution in the main calculations to avoid these difficulties. We give results for bismuth, thallium, lead and cesium; correlation (for the first three of these) and shielding (for all of these atoms) have been included by means of configuration interaction. We give the ratio R in both Coulomb (velocity) and Babushkin (length) gauges, and for bismuth, thallium and cesium a reasonable level of gauge invariance in the unshielded calculations was obtained, in contrast to other calculations.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Atomic physics & molecular physics