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The half-lives of three $\beta$ decaying states of $^{131}_{~49}$In$_{82}$have been measured with the GRIFFIN $\gamma$-ray spectrometer at theTRIUMF-ISAC facility to be $T_{1/2}(1/2^-)=328(15)$~ms,$T_{1/2}(9/2^+)=265(8)$~ms, and $T_{1/2}(21/2^+)=323(55)$~ms, respectively. Thefirst observation of $\gamma$-rays following the $\beta n$ decay of $^{131}$Ininto $^{130}$Sn is reported. The $\beta$-delayed neutron emission probabilityis determined to be $P_{1n} = 12(7)\%$ for the $21/2^+$ state and $2.3(3)\%$from the combined $1/2^-$ and $9/2^+$ states of $^{131}_{~49}$In$_{82}$observed in this experiment. A significant expansion of the decay scheme of$^{131}$In, including 17 new excited states and 34 new $\gamma$-ray transitionsin $^{131}_{~50}$Sn$_{81}$ is also reported. This leads to large changes in thededuced $\beta$ branching ratios to some of the low-lying states of $^{131}$Sncompared to previous work with implications for the strength of thefirst-forbidden $\beta$ transitions in the vicinity of doubly-magic$^{132}_{~50}$Sn$_{82}$.

$\beta$ and $\beta$-delayed neutron decay of the $N=82$ nucleus $^{131}_{~49}$In$_{82}$