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

We report a new measurement of the strength of the superallowed 0(+)-->0(+) transition in the beta-decay of C-10. The experiment was done at the LBNL 88-inch cyclotron using forty-seven GAMMASPHERE germanium detectors. The te chnique used in this measurement was similar to that of an earlier experime nt, but the systematic corrections were significantly different. The measur ed branching ratio: 1.4665 +/- 0.0038 x 10(-2) is used to compute the super allowed Fermi ft, which gives the weak vector coupling constant and the re to d element of the Cabibbo-Kobayashi-Maskawa quark mixing matrix. (C) 1999 Elsevier Science B.V. All rights reserved.