III. Inelastic neutron scattering in lithium seven

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Abstract
The cross section for the reaction 7Li(nn′)7Li*, in which the residual nucleus is left in its first excited state (478 kev), has been measured as a function of neutron bombarding energy from the threshold up to 1·65 mev. The reaction was studied by observation, with both stilbene and sodium iodide crystal detectors, of the γ-rays from the 7Li*. Details of the experimental method are given. The shape of the excitation curve for the reaction immediately above threshold indicates a strong s-wave contribution due to a (1-) level in the 8Li compound nucleus. Above this region the curve rises to a peak at a neutron energy of about 1·35 mev, corresponding to a 8Li level at 3·2 mev (Γ≅1 mev), which can be interpreted in termsof theoretical models as either a (1+) or, possibly, a (1-) state.

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