High-precision β decay half-life measurements of proton-rich nuclei for testing the CVC hypothesis

The experimental study of super-allowed nuclear beta decays serves as a sensitive probe of the conservation of the weak vector current (CVC) and allows tight limits to be set on the presence of scalar or right-handed currents. Once CVC is verified, it is possible to determine the V-ud element of the CKM quark-mixing matrix. Similarly, the study of nuclear mirror beta decays allows to arrive at the same final quantity V-ud. Whereas dedicated studies of 0(+) -> 0(+) decays are performed for several decades now, the potential of mirror transitions was only rediscovered recently. Therefore, it can be expected that important progress is possible with high-precision studies of different mirror beta decays. In the present piece of work the half-life measurements performed by the CENBG group of the proton-rich nuclei Ti-42, Ca38-39, S30-31 and P-29 are summarised.