  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)$\%$.

Nuclear Experiment