Identification of the $\gamma$ transitions in Tc and Cs products of ${}^{252}\mathrm{Cf}$ fission and possible ${7/2}^{+}$ [413] bands in ${}^{105-109}\mathrm{Tc}$ isotopes

Several $\gamma$ transitions in ${}^{105-109}\mathrm{Tc}$ nuclei were identified for the first time from spontaneous fission studies with a ${}^{252}\mathrm{Cf}$ source and the Gammasphere. New level schemes are proposed and related to the underlying nuclear structure. Positive parity bands with a large signature splitting observed in ${}^{105,107,109}\mathrm{Tc}$ are evidently derived from $g_{9/2}$ orbitals and are similar to analogous bands in ${}^{103}\mathrm{Rh},$${}^{103}\mathrm{Ag},$ and ${}^{99}\mathrm{Y}.$ New $\gamma$ transitions have also been identified in ${}^{139-143}\mathrm{Cs}$ and used to construct level schemes for these isotopes. Correlated-pair fission yields extracted from the data show an appreciable field for the zero neutron ${}^{109}\mathrm{Tc}{/}^{143}\mathrm{Cs}$ pair.