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تسجيل مستخدم جديدSpectroscopic studies of neutron-rich $^{129}$In and its $beta$-decay daughter, $^{129}$Sn, using the GRIFFIN spectrometer
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The $beta$-decay of neutron-rich $^{129}$In into $^{129}$Sn was studied using the GRIFFIN spectrometer at the ISAC facility at TRIUMF. The study observed the half-lives of the ground state and each of the $beta$-decaying isomers. The level scheme of $^{129}$Sn has been expanded with thirty-one new $gamma$-ray transitions and nine new excited levels, leading to a re-evaluation of the $beta$-branching ratios and level spin assignments. The observation of the $beta$-decay of the (29/2$^{+}$) 1911-keV isomeric state in $^{129}$In is reported for the first time, with a branching ratio of 2.0(5)$%$.
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9}$Cd was extracted using the Ion Guide Laser Ion Source (IG-LIS). $beta$- and $gamma$-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. %, along with the $beta$-particles were detected with SCEPTAR. From the $beta$-$gamma$-$gamma$ coincidence analysis, 32 new transitions and 7 new excited states were established, expanding the previously known level scheme of $^{129}$In. The $log ft$ values deduced from the $beta$-feeding intensities suggest that some of the high-lying states were populated by the $ u 0 g_{7/2} rightarrow pi 0 g_{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.
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