Trapped-ion decay spectroscopy towards the determination of ground-state components of double-beta decay matrix elements

Abstract.A new technique has been developed at the TRIUMF’s TITAN facility to perform in-trap decay spectroscopy. The aim of this technique is to eventually measure weak electron capture branching ratios (ECBRs) and by this to consequently determine GT matrix elements of $$ \beta$$$$ \beta$$ decaying nuclei. These branching ratios provide important input to the theoretical description of these decays. The feasibility and power of the technique is demonstrated by measuring the ECBR of 124Cs .