dorsal/arxiv
View SchemaNuclear Octupole Correlations and the Enhancement of Atomic Time-Reversal Violation
| Authors | J. Engel, J. L. Friar, A. C. Hayes |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9910008 |
| URL | https://arxiv.org/abs/nucl-th/9910008 |
| DOI | 10.1103/PhysRevC.61.035502 |
| Journal | Phys.Rev.C61:035502,2000 |
Abstract
We examine the time-reversal-violating nuclear ``Schiff moment'' that induces electric dipole moments in atoms. After presenting a self-contained derivation of the form of the Schiff operator, we show that the distribution of Schiff strength, an important ingredient in the ground-state Schiff moment, is very different from the electric-dipole-strength distribution, with the Schiff moment receiving no strength from the giant dipole resonance in the Goldhaber-Teller model. We then present shell-model calculations in light nuclei that confirm the negligible role of the dipole resonance and show the Schiff strength to be strongly correlated with low-lying octupole strength. Next, we turn to heavy nuclei, examining recent arguments for the strong enhancement of Schiff moments in octupole-deformed nuclei over that of 199Hg, for example. We concur that there is a significant enhancement while pointing to effects neglected in previous work (both in the octupole-deformed nuclides and 199Hg) that may reduce it somewhat, and emphasizing the need for microscopic calculations to resolve the issue. Finally, we show that static octupole deformation is not essential for the development of collective Schiff moments; nuclei with strong octupole vibrations have them as well, and some could be exploited by experiment.
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"abstract": "We examine the time-reversal-violating nuclear ``Schiff moment\u0027\u0027 that induces\nelectric dipole moments in atoms. After presenting a self-contained derivation\nof the form of the Schiff operator, we show that the distribution of Schiff\nstrength, an important ingredient in the ground-state Schiff moment, is very\ndifferent from the electric-dipole-strength distribution, with the Schiff\nmoment receiving no strength from the giant dipole resonance in the\nGoldhaber-Teller model. We then present shell-model calculations in light\nnuclei that confirm the negligible role of the dipole resonance and show the\nSchiff strength to be strongly correlated with low-lying octupole strength.\nNext, we turn to heavy nuclei, examining recent arguments for the strong\nenhancement of Schiff moments in octupole-deformed nuclei over that of 199Hg,\nfor example. We concur that there is a significant enhancement while pointing\nto effects neglected in previous work (both in the octupole-deformed nuclides\nand 199Hg) that may reduce it somewhat, and emphasizing the need for\nmicroscopic calculations to resolve the issue. Finally, we show that static\noctupole deformation is not essential for the development of collective Schiff\nmoments; nuclei with strong octupole vibrations have them as well, and some\ncould be exploited by experiment.",
"arxiv_id": "nucl-th/9910008",
"authors": [
"J. Engel",
"J. L. Friar",
"A. C. Hayes"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.61.035502",
"journal_ref": "Phys.Rev.C61:035502,2000",
"title": "Nuclear Octupole Correlations and the Enhancement of Atomic Time-Reversal Violation",
"url": "https://arxiv.org/abs/nucl-th/9910008"
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