Test of Lorentz invariance in β decay of polarized 20Na

被引：4

作者：

Sytema, A. ^{[1
]}

van den Berg, J. E. ^{[1
]}

Boll, O. ^{[1
]}

Chernowitz, D. ^{[1
]}

Dijck, E. A. ^{[1
]}

Grasdijk, J. O. ^{[1
]}

Hoekstra, S. ^{[1
]}

Jungmann, K. ^{[1
]}

Mathavan, S. C. ^{[1
]}

Meinema, C. ^{[1
]}

Mohanty, A. ^{[1
]}

Muller, S. E. ^{[1
,2
]}

Noordmans, J. P. ^{[1
,3
]}

Portela, M. Nunez ^{[1
]}

Onderwater, C. J. G. ^{[1
]}

Pijpker, C. ^{[1
]}

Timmermans, R. G. E. ^{[1
]}

Vos, K. K. ^{[1
]}

Willmann, L. ^{[1
]}

Wilschut, H. W. ^{[1
]}

机构：

[1] Univ Groningen, Swinderen Inst Particle Phys & Grav, Nijenborgh 4, NL-9747 AG Groningen, Netherlands

[2] Helmholtz Zentrum Dresden Rossendorf, Dresden, Germany

[3] Univ Algarve, Dept Fis, CENTRA, Faro, Portugal

来源：

PHYSICAL REVIEW C | 2016年 / 94卷 / 02期

关键词：

ROTATIONAL INVARIANCE; SYMMETRY;

D O I：

10.1103/PhysRevC.94.025503

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Background: Lorentz invariance is key in our understanding of nature, yet relatively few experiments have tested Lorentz invariance in weak interactions. Purpose: Our goal is to obtain limits on Lorentz-invariance violation in weak interactions, in particular rotational invariance in beta decay. Method: We search for a dependence of the lifetime of Na-20 nuclei on the nuclear spin direction. Such directional dependence would be evidence for Lorentz-invariance violation in weak interactions. A difference in lifetime between nuclei that are polarized in the east and west direction is searched for. This difference is maximally sensitive to the rotation of the Earth, while the sidereal dependence is free from most systematic errors. Results: The experiment sets a limit of 2 x 10(-4) at 90% C.L. on the amplitude of the sidereal variation of the relative lifetime differences, an improvement by a factor 15 compared to an earlier result. Conclusions: No significant violation of Lorentz invariance is found. The result sets limits on parameters of theories describing Lorentz-invariance violation.

引用

页数：9

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