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Title: Limit on the Temporal Variation of the Fine-Structure Constant Using Atomic Dysprosium

Abstract

Over 8 months, we monitored transition frequencies between nearly degenerate, opposite-parity levels in two isotopes of atomic dysprosium (Dy). These frequencies are sensitive to variation of the fine-structure constant ({alpha}) due to relativistic corrections of opposite sign for the opposite-parity levels. In this unique system, in contrast to atomic-clock comparisons, the difference of the electronic energies of the opposite-parity levels can be monitored directly utilizing a rf electric-dipole transition between them. Our measurements show that the frequency variation of the 3.1-MHz transition in {sup 163}Dy and the 235-MHz transition in {sup 162}Dy are 9.0{+-}6.7 Hz/yr and -0.6{+-}6.5 Hz/yr, respectively. These results provide a rate of fractional variation of {alpha} of (-2.7{+-}2.6)x10{sup -15} yr{sup -1} (1{sigma}) without assumptions on constancy of other fundamental constants, indicating absence of significant variation at the present level of sensitivity.

Authors:
; ;  [1]; ; ;  [2];  [1];  [3]
  1. Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300 (United States)
  2. Physics Division, Los Alamos National Laboratory, P-23, MS-H803, Los Alamos, New Mexico 87545 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
20861630
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevLett.98.040801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COMPARATIVE EVALUATIONS; CORRECTIONS; DYSPROSIUM; DYSPROSIUM 162; DYSPROSIUM 163; E1-TRANSITIONS; FINE STRUCTURE; FUNDAMENTAL CONSTANTS; MHZ RANGE; PARITY; RELATIVISTIC RANGE

Citation Formats

Cingoez, A., Lapierre, A., Leefer, N., Nguyen, A.-T., Lamoreaux, S. K., Torgerson, J. R., Budker, D., and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Limit on the Temporal Variation of the Fine-Structure Constant Using Atomic Dysprosium. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.040801.
Cingoez, A., Lapierre, A., Leefer, N., Nguyen, A.-T., Lamoreaux, S. K., Torgerson, J. R., Budker, D., & Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Limit on the Temporal Variation of the Fine-Structure Constant Using Atomic Dysprosium. United States. doi:10.1103/PHYSREVLETT.98.040801.
Cingoez, A., Lapierre, A., Leefer, N., Nguyen, A.-T., Lamoreaux, S. K., Torgerson, J. R., Budker, D., and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Fri . "Limit on the Temporal Variation of the Fine-Structure Constant Using Atomic Dysprosium". United States. doi:10.1103/PHYSREVLETT.98.040801.
@article{osti_20861630,
title = {Limit on the Temporal Variation of the Fine-Structure Constant Using Atomic Dysprosium},
author = {Cingoez, A. and Lapierre, A. and Leefer, N. and Nguyen, A.-T. and Lamoreaux, S. K. and Torgerson, J. R. and Budker, D. and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720},
abstractNote = {Over 8 months, we monitored transition frequencies between nearly degenerate, opposite-parity levels in two isotopes of atomic dysprosium (Dy). These frequencies are sensitive to variation of the fine-structure constant ({alpha}) due to relativistic corrections of opposite sign for the opposite-parity levels. In this unique system, in contrast to atomic-clock comparisons, the difference of the electronic energies of the opposite-parity levels can be monitored directly utilizing a rf electric-dipole transition between them. Our measurements show that the frequency variation of the 3.1-MHz transition in {sup 163}Dy and the 235-MHz transition in {sup 162}Dy are 9.0{+-}6.7 Hz/yr and -0.6{+-}6.5 Hz/yr, respectively. These results provide a rate of fractional variation of {alpha} of (-2.7{+-}2.6)x10{sup -15} yr{sup -1} (1{sigma}) without assumptions on constancy of other fundamental constants, indicating absence of significant variation at the present level of sensitivity.},
doi = {10.1103/PHYSREVLETT.98.040801},
journal = {Physical Review Letters},
number = 4,
volume = 98,
place = {United States},
year = {Fri Jan 26 00:00:00 EST 2007},
month = {Fri Jan 26 00:00:00 EST 2007}
}