Decay spectroscopy of Cd129

Abstract

Excited states of 129 In populated following the β decay of 129 Cd 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 129 Cd was extracted using the Ion Guide Laser Ion Source (IG-LIS). β and γ rays following the decay of 129 Cd 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 129 In. The log f t values deduced from the β-feeding intensities suggest that some of the high-lying states were populated by the ν0g 7/2 → π 0g 9/2 allowed Gamow-Teller (GT) transition, which indicates that the allowed GT transition is more dominant in the 129 Cd decay than previously reported. Observation of fragmented Gamow-Teller strengths is consistent with theoretical calculations.

Applying machine learning methods for the analysis of two-dimensional mass spectra

“…In the decay scheme of Fig. 7 , the branching ratio of the isomeric transition of In is below 0.3% [ 25 ], and the branching ratios from Cd to the excited state and the ground state of In are 32 (12)% and 68 (12)% [ 31 ]. Considering the average is 0.01 which means the feeding from Cd is negligible, the decay losses of the isomer and the ground state of In are the dominant contributions to the decay correction.…”