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Title: Breit interaction and parity nonconservation in many-electron atoms

Abstract

We present accurate ab initio nonperturbative calculations of the Breit correction to the parity nonconserving (PNC) amplitudes of the 6s-7s and 6s-5d{sub 3/2} transitions in Cs, 7s-8s and 7s-6d{sub 3/2} transitions in Fr, 6s-5d{sub 3/2} transition in Ba{sup +}, 7s-6d{sub 3/2} transition in Ra{sup +}, and 6p{sub 1/2}-6p{sub 3}/{sub 2} transition in Tl. The results for the 6s-7s transition in Cs and 7s-8s transition in Fr are in good agreement with other calculations. We demonstrate that higher-orders many-body corrections to the Breit interaction are especially important for the s-d PNC amplitudes. We confirm good agreement of the PNC measurements for cesium and thallium with the standard model.

Authors:
; ;  [1];  [2]
  1. School of Physics, University of New South Wales, Sydney 2052 (Australia)
  2. (United States)
Publication Date:
OSTI Identifier:
20974514
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 73; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.73.022112; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; AMPLITUDES; ATOMS; BARIUM; CATIONS; CESIUM; COMPUTER CALCULATIONS; ELECTRONIC STRUCTURE; ELECTRONS; FRANCIUM; MANY-BODY PROBLEM; P INVARIANCE; RADIUM; STANDARD MODEL; THALLIUM; WEAK INTERACTIONS

Citation Formats

Dzuba, V. A., Flambaum, V. V., Safronova, M. S., and Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716. Breit interaction and parity nonconservation in many-electron atoms. United States: N. p., 2006. Web. doi:10.1103/PHYSREVA.73.022112.
Dzuba, V. A., Flambaum, V. V., Safronova, M. S., & Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716. Breit interaction and parity nonconservation in many-electron atoms. United States. doi:10.1103/PHYSREVA.73.022112.
Dzuba, V. A., Flambaum, V. V., Safronova, M. S., and Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716. Wed . "Breit interaction and parity nonconservation in many-electron atoms". United States. doi:10.1103/PHYSREVA.73.022112.
@article{osti_20974514,
title = {Breit interaction and parity nonconservation in many-electron atoms},
author = {Dzuba, V. A. and Flambaum, V. V. and Safronova, M. S. and Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716},
abstractNote = {We present accurate ab initio nonperturbative calculations of the Breit correction to the parity nonconserving (PNC) amplitudes of the 6s-7s and 6s-5d{sub 3/2} transitions in Cs, 7s-8s and 7s-6d{sub 3/2} transitions in Fr, 6s-5d{sub 3/2} transition in Ba{sup +}, 7s-6d{sub 3/2} transition in Ra{sup +}, and 6p{sub 1/2}-6p{sub 3}/{sub 2} transition in Tl. The results for the 6s-7s transition in Cs and 7s-8s transition in Fr are in good agreement with other calculations. We demonstrate that higher-orders many-body corrections to the Breit interaction are especially important for the s-d PNC amplitudes. We confirm good agreement of the PNC measurements for cesium and thallium with the standard model.},
doi = {10.1103/PHYSREVA.73.022112},
journal = {Physical Review. A},
number = 2,
volume = 73,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}
  • The contribution from the inner shells to the matrix elements of a parity violating weak interaction is examined. It is shown that the correction thus obtained does not compensate the effect but rather increases it by 20 to 40%.
  • Results are presented of measurements of the natural optical activity of atomic bismuth vapor in the region of the M1 transition /sup 4/S/sub 3/2/--/sup 2/D/sub 5/2/ at l = 648 nm. The measured value of the circular polarization P = -2R = -2 Im (A(E1)/(M1)) = (40.4 +- 5.4) x 10/sup -8/ agrees with the results of the calculations performed within the framework of the Weinberg-Salam method with sin/sup 2/q = 0.25.
  • An estimate is made of the effect of nonconservation of parity of the 3d-orbit meson states for mesic atoms with odd nuclei in the Z=56--60 and Zapprox.83 ranges in which the hyperfine structure terms of the 3p/sup 3///sub 2/--3d/sup 5///sub 2/ and 3p/sup 1///sub 2/--3d/sup 5///sub 2/ orbits respectively intersect. The angular distribution coefficient ..cap alpha.. in W (theta) =1+..cap alpha..costheta for quanta emitted by polarized mesic atoms in the 3d..-->..1s transition is determined. The effect of a weak neutral interaction between a muon and a nucleus and the Coulomb polarization mechanism for transferring the nonconservation of parity of nuclearmore » states to mesic atom states in the chain of nonradiative transitions of a meson are considered. In the nuclear ranges indicated above the effect of the weak interaction for 3d- and 3p-orbits is smaller by two--three orders of magnitude than the effect of the polarization mechanism. Under optimal conditions for the intersection of 3d/sup 5///sub 2/ and 3p/sup 3///sub 2/ terms of a mesic atom which, as is shown, can be realized in the range Z=56--60 this mechanism leads to a value of the coefficient ..cap alpha.. which is approximately equal to the amplitude for the nonconservation of parity for nuclear states ..beta.. (I/sub ..nu../E/sub ..nu../) lying at E/sub ..nu../approx. =h..omega.. (3d..-->..1s) and E/sub ..nu../approx. =h..omega.. (3d..-->..2p). If dynamic amplification of the nonconservation of parity of nuclear states occurs at E/sub ..nu../approx. =5--6 MeV, i.e., ..beta.. (I/sub ..nu../E/sub ..nu../) approx.10/sup -5/, then for the quanta arising from a 3d..-->..1s transition of a meson under real conditions for the transfer of polarization of the meson spin in the cascade of transitions populating the 3d/sup 5///sub 2/-orbit the anisotropy coefficient ..cap alpha.. can attain a value of approx.10/sup -5/.« less