The decay properties of ${}^{127}\mathrm{In}$ and ${}^{129}\mathrm{In}$ have been investigated using Isotope Separation On-Line (ISOL) produced samples. In both ${}^{127}\mathrm{In}$ and ${}^{129}\mathrm{In}$ new $\beta$-decaying isomeric states were observed, with half-lives of $1.04\pm 0.10$ and $0.67\pm 0.10\mathrm{s}$, respectively, in addition to the previously known isomers of single proton hole $p_{1∕2}$ and $g_{9∕2}$ character. ${\mathrm{Q}}_{\beta }$ measurements show that the new isomeric states are present at energies approaching $2\text{MeV}$ above the ground states. The level schemes of ${}^{127}\mathrm{Sn}$ and ${}^{129}\mathrm{Sn}$ have been considerably extended. The modes of feeding and decay of the two $\mu \mathrm{s}$ isomers in each of the Sn nuclei are fully elucidated, including new half-life determinations. Shell model calculations on ${}^{127}\mathrm{Sn}$ and ${}^{129}\mathrm{Sn}$ were performed, giving results in good agreement with the new data.

• Received 5 December 2003

DOI:https://doi.org/10.1103/PhysRevC.69.054307