Precision measurements with LPCTrap at GANIL

TL;DR

This paper reports on the LPCTrap device at GANIL, which enables high-precision measurements of beta decay correlations to test the weak interaction and search for new physics beyond the Standard Model.

Contribution

It presents the first determination of charge state distributions of recoiling ions in beta decay and refines analysis methods to improve constraints on exotic tensor currents and CKM matrix elements.

Findings

Charge state distributions of recoiling ions measured for the first time.

Refined analysis enhances sensitivity to exotic tensor currents.

Improved precision in Vud element from mirror transitions.

Abstract

The experimental achievements and the results obtained so far with the LPCTrap device installed at GANIL are presented. The apparatus is dedicated to the study of the weak interaction at low energy by means of precise measurements of the BETA-NU angular correlation parameter in nuclear BETA decays. So far, the data collected with three isotopes have enabled to determine, for the first time, the charge state distributions of the recoiling ions, induced by shakeoff process. The analysis is presently refined to deduce the correlation parameters, with the potential of improving both the constraint deduced at low energy on exotic tensor currents (6He1+) and the precision on the V u d element of the quark-mixing matrix (35Ar1+ and 19Ne1+) deduced from the mirror transitions dataset.