Search for variation of fundamental constants and violations of fundamental symmetries using isotope comparisons

被引：21

作者：

Berengut, J. C. ^{[1
]}

Flambaum, V. V. ^{[1
]}

Kava, E. M. ^{[1
]}

机构：

[1] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

来源：

PHYSICAL REVIEW A | 2011年 / 84卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

TIME-VARIATION; UNIFICATION; MASS;

D O I：

10.1103/PhysRevA.84.042510

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Atomic microwave clocks based on hyperfine transitions, such as the caesium standard, tick with a frequency that is proportional to the magnetic moment of the nucleus. This magnetic moment varies strongly between isotopes of the same atom, while all atomic electron parameters remain the same. Therefore the comparison of two microwave clocks based on different isotopes of the same atom can be used to constrain variation of fundamental constants. In this paper, we calculate the neutron and proton contributions to the nuclear magnetic moments, as well as their sensitivity to any potential quark-mass variation, in a number of isotopes of experimental interest including Hg-201,Hg-199 and Rb-87,Rb-85, where experiments are underway. We also include a brief treatment of the dependence of the hyperfine transitions to variation in nuclear radius, which in turn is proportional to any change in quark mass. Our calculations of expectation values of proton and neutron spin in nuclei are also needed to interpret measurements of violations of fundamental symmetries.

引用

页数：6

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