IDENTIFICATION OF THE GAMMA-TRANSITIONS IN TC AND CS PRODUCTS OF CF-252 FISSION AND POSSIBLE 7 2(+)[413] BANDS IN TC105-109 ISOTOPES/

Several gamma transitions in Tc105-109 nuclei were identified for the first time from spontaneous fission studies with a Cf-252 source and t he Gammasphere. New level schemes are proposed and related to the unde rlying nuclear structure. Positive parity bands with a large signature splitting observed in Tc-105,Tc-107,Tc-109, evidently derived from g( 9/2) orbitals and are similar to analogous bands in Rh-103, Ag-103, an d Y-99. New gamma transitions have also been identified in Cs139-143 a nd used to construct level schemes for these isotopes. Correlated-pair fission yields extracted from the data show an appreciable field for the zero neutron Tc-109/Cs-143 pair. [S0556-2813(98)05205-4].