Abstract
Excited states of 129In populated following the beta decay of Cd-129 were experimentally studied with the GRIFFIN spectrometer at the ISAC facility of TRIUMF, Canada. A 480-MeV proton beam was impinged on a uranium carbide target and Cd-129 was extracted using the Ion Guide Laser Ion Source (IG-LIS). beta and. rays following the decay of 129Cd were detected with the GRIFFIN spectrometer comprising the plastic scintillator SCEPTAR and 16 high-purity germanium (HPGe) clover-type detectors. From the beta-gamma-gamma coincidence analysis, 32 new transitions and seven new excited states were established, expanding the previously known level scheme of In-129. The log ft values deduced from the beta-feeding intensities suggest that some of the high-lying states were populated by the nu 0g7(/2) -> pi 0g(9/2) allowed Gamow-Teller (GT) transition, which indicates that the allowed GT transition is more dominant in the Cd-129 decay than previously reported. Observation of fragmented Gamow-Teller strengths is consistent with theoretical calculations.