Atomic parity violation experiments

Commins, Eugene D.

doi:10.1088/0031-8949/36/3/015

Cited by 19 publications

(6 citation statements)

References 24 publications

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“…Atomic parity non-conservation (Bouchiat and Bouchiat 1974) is now well established experimentally (Commins 1987, Hinds 1989) in agreement with the predictions of the unified theory of electro-weak interactions. Experiments in caesium (Noecker et a1 1988) have now reached a precision of 2% and an accuracy of 1% or better is expected in the near future.…”

Section: Introductionsupporting

confidence: 66%

A semi-empirical approach to the calculation of parity non-conserving E1 transition matrix elements in caesium

Hartley¹,

Sandars²

1990

J. Phys. B: At. Mol. Opt. Phys.

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In this paper we describe a semi-empirical approach for calculating certain high-order perturbation effects in a simple manner. We use these modified orbitals in RPA type equations to give values for E l transition matrix elements and hyperfine dipole constants that agree well with experiment. Including the spin-independent weak interaction leads to parity non-conserving equations. For the caesium 6s,,, + 7s,,, parity nonconserving E l transition we obtain 0.904 (1 *0.02) x lo-'' (-ieaoQw/N).where for caesium we used c = 5.674 fm and a = 0.52339 fm. These were deliberately chosen to be the same as those used by Johnson et a1 (1986) for comparison with their calculations. PNC H FAs first shown by Sandars (1977), it is possible to include the spin-independent weak interaction directly in the atomic Hamiltonian due to the scalar nature of the operator.

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Section: Introductionsupporting

confidence: 66%

A semi-empirical approach to the calculation of parity non-conserving E1 transition matrix elements in caesium

Hartley¹,

Sandars²

1990

J. Phys. B: At. Mol. Opt. Phys.

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“…At the present time, PNC measurements in stable 133 Cs atoms have ±2% experimental uncertainty [5]. (An earlier experiment in Cs was performed by Bouchiat et al [6]; the studies of PNC effects in atoms have been reviewed by Commins [7] and Telegdi [8].) However, improvement by an order of magnitude in the experimental accuracy is anticipated and a possibility of measuring PNC effects in unstable cesium and francium isotopes has been discussed [9].…”

Section: Introductionmentioning

confidence: 99%

Atomic parity nonconservation and neutron radii in cesium isotopes

Chen¹,

Vogel²

1993

Phys. Rev. C

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The interpretation of future precise experiments on atomic parity violation in terms of parameters of the Standard Model could be hampered by uncertainties in the atomic and nuclear structure. While the former can be overcome by measurement in a series of isotopes, the nuclear structure requires knowledge of the neutron density.We use the nuclear Hartree-Fock method, which includes deformation effects, to calculate the proton and neutron densities in 125 Cs -139 Cs. We argue that the good agreement with the experimental charge radii, binding energies, and ground state spins signifies that the phenomenological nuclear force and the method of calculation that we use is adequate. Based on this agreement, and on calculations involving different effective interactions, we estimate the uncertainties in the differences of the neutron radii δ r 2 N,N ′ and conclude that they cause uncertainties in the ratio of weak charges, the quantities determined in the atomic parity nonconservation experiments, of less than 10 −3 . Such an uncertainty is smaller than the anticipated experimental error.

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“…This is much higher than the values of R for, say, bismuth ( R = -9 x lo-' at 648 nm and R = -10 x IO-' at 876 nm (see e.g. Commins 1987)). On the other hand it is much harder to obtain the same degree of absorption on the samarium transition than on the bismuth transitions.…”

Section: The Relevant Quantitiesmentioning

confidence: 67%

On the feasibility of detecting parity non-conserving optical rotation at 639 nm in Sm I

Davies¹,

Baird²,

Sandars³

et al. 1989

J. Phys. B: At. Mol. Opt. Phys.

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An experimental study has been made of the nearly degenerate, opposite parity states 4f 66s6p 7G1 and 4f 65d6s 7G1 in samarium to assess the feasibility of using the forbidden M1 transition from the 4f 66s 2 7F0 ground state to the 4f 65d6s 7G1 state for measuring parity non-conserving (PNC) effects. The authors conclude that detection of the PNC optical rotation is not feasible because of the high background rotation present at the M1 wavelength and also because the PNC signal itself would be significantly smaller than in existing PNC experiments. Consideration has also been given to the possibility of a novel optical rotation experiment on this transition, using crossed electric and magnetic fields. However, this too is concluded not to be feasible due to the difficulty in achieving a sufficiently large PNC signal. A general comment on the future of rare earth elements for PNC studies is made.

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Atomic parity violation experiments

Cited by 19 publications

References 24 publications

A semi-empirical approach to the calculation of parity non-conserving E1 transition matrix elements in caesium

A semi-empirical approach to the calculation of parity non-conserving E1 transition matrix elements in caesium

Atomic parity nonconservation and neutron radii in cesium isotopes

On the feasibility of detecting parity non-conserving optical rotation at 639 nm in Sm I

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