Weak Interaction Physics at TwinSol

A program to investigate the unitarity of Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix by studying super-allowed mixed mirror β decays has been initiated at TwinSol facility Notre Dame. These Fermi/Gamow-Teller (F-GT) decays, occurring between T=1/2 isospin doublets in nuclei, provide a complimentary check on data from pure Fermi 0 + states. The first part program, involving measurement lifetimes relevant nuclei required accuracy one 10 3 or better, nearly completed. However, additional complication introduced F-GT mixing requires use an ion trap measure ratio ρ with similar accuracy. lifetime measurements, as well progress installing , will be discussed. In addition, since require dedicated beam line for its operation, opportunity presented itself greatly improve performance reaction studies exotic nuclei. This took form added dipole switching magnet coupled third solenoid new TriSol currently under construction. expected properties and application interest nuclear astrophysics, also