Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 78: Fundamentale Symmetrien
HK 78.1: Gruppenbericht
Donnerstag, 7. März 2013, 16:45–17:15, HSZ-401
A test of Lorentz invariance in β decay — Auke Sytema, Elwin Dijck, Stefan Müller, Gerco Onderwater, Coen Pijpker, •Hans Wilschut, Jacob Noordmans, and Rob Timmermans — Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, Nehterlands
In theories aiming to unify the Standard Model with gravity, Lorentz invariance may be broken. Although Lorentz symmetry appears to hold well, few experiments have been performed that consider its violation in the weak interaction. We have started a theoretical and experimental research program to this effect. In particular we consider a Lorentz-violating correction of the W-boson propagator, which manifests itself in a directional dependence of the β-decay rate and may be independent of boosts. We will discuss in the context of this extension of the Standard Model which observables are sensitive. Specifically, we consider allowed Fermi and Gamow-Teller transitions and explore the spin degrees of freedom in the latter.
Experimentally we exploit the Gamow-Teller transition of polarized 20Na. The transition rate (i.e. lifetime) would depend on the spin orientation of 20Na. The accuracy of the experiment relies on the fact that one measures an asymmetry when reversing the spin. The asymmetry should also follow the earth’s rotation, depending on the polarization direction. The method of the measurement will be presented, together with the first results.