A new measurement of the strength of the superallowed Fermi branch in the beta decay of 10C with GAMMASPHERE

Abstract We report a new measurement of the strength of the superallowed 0 + →0 + transition in the β -decay of 10 C. The experiment was done at the LBNL 88-inch cyclotron using forty-seven GAMMASPHERE germanium detectors. The technique used in this measurement was similar to that of an earlier experiment, but the systematic corrections were significantly different. The measured branching ratio: 1.4665±0.0038×10 −2 is used to compute the superallowed Fermi f t, which gives the weak vector coupling constant and the u to d element of the Cabibbo–Kobayashi–Maskawa quark mixing matrix.