Abstract
A helium 3 neutron spectrometer has been used to study the spectrum of neutrons inside a spherical uranium shell, 3 cm thick, when the latter is bombarded with monoenergetic neutrons of various energies between 500 keV and 1.0 MeV. The spectra of neutrons scattered inelastically and also the cross sections for this process have been derived, and the results compared with those predicted by current nuclear theory. Evidence for the existence of the low-lying rotational levels of uranium 238 is presented, and at least one new level at 700 keV (and possibly more at higher energies) has been found. Qualitative confirmation has been obtained by measuring the spectrum of neutrons from a uranium shell, 11.5 cm thick, with a neutron source in the centre.
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