Nuclear structure near 1g sub(9/2) shell closure

The decay properties of 90Rb, 102,103,104,106In and 120,122,124In nuclei were investigated using γ,β,βγ and conversion electron spectroscopic methods. The sources were produced from internal bombardment and from the on-line mass spectrometer facility using the external beam of the McGill synchrocyclotron. Modifications to the mass spectrometer for converting it into an isotope separator are described. Separate decay schemes for the following isomers are proposed. sup (90g)Rb (T1/2 = 2.70 +-0.05 min, J sup(π) = (1-)), sup (90m)Rb (T1/2 = 4.30 +- 0.07 min, J sup(π) = (4-)), 102In (T1/2 = 42 +- 8 sec), 103In (T1/2 = 59+- 10 sec), 104In (T1/2 = 1.8 +- 0.2 min), sup (106g)In (T1/2 = 6.2 +- 0.1 min, J sup(π) = (6+, 7+)), sup (106m)In (T1/2 = 5.2 +- 0.1 min, J sup(π) = (3+-)) 120In (T1/2 = 46.2 +- 0.8 sec. J sup(π) = (3+, 4+, 5+), T1/2 = 47.3 +- 0.5 sec, J sup(π) = (8-)), 122In (T1/2 = 10.3 +- 0.6 sec, J sup(π) = (3+, 4+, 5+), T1/2 = 10.8 +- 0.4 sec, J sup(π) = (8-)), and 124 In (T1/2 = 3.9 +- 0.3 sec, J sup(π) = (8-)). The resultant level structure of the daughter nuclei are compared to a theoretical calculation based on the BCS formalism with the Tabakin residual interaction using an inert core of Z=28, N=50. (auth)