Levels in 237U studied by resonant neutron capture

Primary and secondary γ rays in ²³⁷U from resonant neutron capture in ²³⁶U have been measured with the fast chopper facility, the neutron monochromator, and 2- and 24-keV neutron beam filters. A level scheme was constructed including 27 levels with spin and parity assignments. Rotational band members of the Nilsson configurations [631↓], [622↑], [624↓], [631↑], [633↓], and [501↓] and of the vibrational bands {[622↑] - 2⁺} and {[631↓] + 0⁺} were identified. There are more levels below 800 keV, in particular, K=12^- bands, than expected from comparison with ²³⁵U and ²³⁹U. The neutron binding energy in ²³⁷U was determined to be 5125.9+/-0.5 keV. NUCLEAR REACTIONS ²³⁶U(n,γ), E_n=5-125 eV, 2 keV, 24 keV measured E_γ, I_γ, deduced ²³⁷U levels, transitions, J, π, photon strengths, Ge(Li) detector, three crystal spectrometer, enriched targets, nuclear structure, Nilsson model, vibrational excitations.