Search for spatial anisotropy in beta-decays

TL;DR

This paper investigates potential spatial anisotropy in beta-decays, testing for covariance violation in weak interactions, and reports an upper limit on directional dependence of beta-electron energy.

Contribution

It provides experimental constraints on anisotropy in beta-decays, exploring possible covariance violation in weak interactions.

Findings

Upper limit of 1.4 x 10^{-5} on directional dependence of beta-electron energy

No significant anisotropy detected in beta-decay of Sr-90

Supports isotropy in weak decay processes

Abstract

Theoretically a possibility of covariance violation in weak decays is not ruled out from the first principles, while there are some models predicting non-covariance revealed in weak interactions. The experimental evidence for isotropy violation in $\beta$-decays was recently reported. We present a study of the dependence of electron flow rate and $\beta$-electron energy in the decay of $Sr^{90}$ with respect to the direction of electron emission. An upper limit of $1.4 \cdot 10^{-5}$ on directional dependence of $\beta$-electron energy was obtained.