The authors would like to thank the operators at the TRIUMF-ISAC facility for providing the radioactive beam. This work was partially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canada Research Chairs Program, NSERC Discovery Grants No. SAPIN-2014-00028 and No. RGPAS 462257-2014, the NSERC CREATE Program IsoSiM (Isotopes for Science and Medicine), the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2017-84756-C4-2-P, the US National Science Foundation (NSF) under Contract No. NSF14-01574, and the Mexican DGAPA-UNAM program under Contract No. PAPIIT-IN110418. The GRIFFIN spectrometer was funded by the Canada Foundation for Innovation (CFI), TRIUMF, and the University of Guelph. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada (NRC). Y.S. would like to thank Jorge Agramunt (IFIC Valencia, Spain) for providing a program for fitting the time distribution of β particles.The authors would like to thank the operators at the TRIUMF-ISAC facility for providing the radioactive beam. This work was partially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canada Research Chairs Program, NSERC Discovery Grants No. SAPIN-2014-00028 and No. RGPAS 462257-2014, the NSERC CREATE Program IsoSiM (Isotopes for Science and Medicine), the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2017-84756-C4-2-P, the US National Science Foundation (NSF) under Contract No. NSF14-01574, and the Mexican DGAPA-UNAM program under Contract No. PAPIIT-IN110418. The GRIFFIN spectrometer was funded by the Canada Foundation for Innovation (CFI), TRIUMF, and the University of Guelph. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada (NRC). Y.S. would like to thank Jorge Agramunt (IFIC Valencia, Spain) for providing a program for fitting the time distribution of β particles.

Excited states of In129 populated following the β decay of Cd129 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 Cd129 was extracted using the Ion Guide Laser Ion Source (IG-LIS). β and γ rays following the decay of Cd129 were detected with the GRIFFIN spectrometer comprising the plastic scintillator SCEPTAR and 16 high-purity germanium (HPGe) clover-type detectors. From the β-γ-γ coincidence analysis, 32 new transitions and seven new excited states were established, expanding the previously known level scheme of In129. The logft values deduced from the β-feeding intensities suggest that some of the high-lying states were populated by the ν0g7/2→π0g9/2 allowed Gamow-Teller (GT) transition, which indicates that the allowed GT transition is more dominant in the Cd129 decay than previously reported. Observation of fragmented Gamow-Teller strengths is consistent with theoretical calculations.

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