Spectroscopy of doubly magic $^{ 132}_{ 50}$Sn$_{ 82}$ has been performed with the GRIFFIN spectrometer at TRIUMF-ISAC following the $\beta$ decay of $^{ 132}_{ 49}$In$_{ 83}$. The analysis has allowed for the placement of a total of 70 transitions and 29 excited states in $^{ 132}$Sn. Detailed spectroscopy has also been performed on $^{ 131}$Sb, resulting from the $\beta$ decay of $^{ 131}$Sn, produced from the $\beta$-delayed neutron decay of $^{ 132}$In. Measurement of $\gamma$-rays in both $^{ 131}$Sn and $^{ 131}$Sb has led to the determination of the $\beta$-delayed neutron emission probability, $P_{ n}$, from $^{ 132}$In. This is the first time the $P_{ n}$ has been measured for this nucleus using $\gamma$ spectroscopy, and the new value of 12.3(4)% is consistent with the most recent $\beta-n$ counting experiment. Additionally, $\gamma$-$\gamma$ angular correlations have been performed in $^{ 132}$Sn, supporting the spin assignments of several excited states. Novel ab initio calculations are presented which describe several of the excited states, and these are compared to the experimental spectrum.
Categories: nucl-ex