Slow Neutron Velocity Spectrometer Studies. III. I, Os, Co, Tl, Cb, Ge

Abstract
The 1v thermal line for iodine is σ=[(3.8±0.2)+(1.12±0.05)E12]. Crystal interference effects are apparent at low energies. There is a resonance at (20.6±0.4) ev with σ0Γ24. A flat-bottomed dip at 37 ev suggests two levels at (32±2) ev and (42±2) ev with approximately equal values of σ0Γ2135. The 1v thermal line for osmium is σ=[(15±0.4)+(2.7±0.1)E12] with crystal interference effects at low energies. There are levels at (6.5±0.3) ev with σ0Γ210, at (8.8±0.3) ev with σ0Γ235, at (20±1) ev with σ0Γ225, probable levels at (28±1.5) ev with σ0Γ28, at (42±2) ev with σ0Γ210, at 84 ev and several unresolved levels above 84 ev. The 1v thermal line for cobalt is σ=[(6.7±0.3)+(6.4±0.15)E12]. There is an unusually strong dip at (115±5) ev with σ0Γ2200,000 (if single) and indications of other strong unresolved levels in the region of 1000 to 10,000 ev. The 1v thermal line for thallium is probably [σ=(9.7±0.2)+(0.6±0.2)E12]. There are strong crystal interference effects at low energies. There is a strong dip in the transmission curve at 270 ev and another broad dip near 1100 ev. Columbium shows only a slight 1v effect σ=[(6.4±0.2)+(0.10±0.04)E12] with strong crystal interference effects at lower energies. Only a slight dip at 4.1 ev attributed to a slight Ta impurity was found in the higher energy region. Germanium shows no 1v thermal slope because of the strong crystal interference effects. There is a (perhaps multiple) level at 95 ev with σ0Γ2800.