LEVELS AND TRANSITION-PROBABILITIES IN SN-120,SN-122,SN-124,SN-126,SN-128 STUDIED IN THE DECAY OF IN ISOTOPES

The energy levels in even Sn nuclei, with A = 120-128, populated in the decay of In isotopes have been studied, using an on-line mass-separator. For A = 122, 124, 126 the mass separation was complemented with a chemical separation of Cd, which removed the high-spin isomers of In from the samples. Three isomers with suggested Iπ = 1+, 4+ or 5+, and (8)- were observed in 120, 122in isomers with Iπ = 3+ and (8)- were found in 124, 126, 128 In. Decay schemes for 10 previously unknown or little known isomeric decays are presented, together with information obtained in measurements of level half-lives in 122, 124, 126, 128Sn. The β- and γ-ray transition probabilities and the systematics of energy levels are used to identify levels in the Sn nuclei which contain large amplitudes of specific two-quasiparticle configurations. © 1979.