In-Beam Studies of High-Spin States of Actinide Nuclei

High-spin states in the actinides have been studied using Coulomb-excitation, inelastic excitation reactions, and one-neutron transfer reactions. Experimental data are presented for states in ^{232} U, ^{233}U, ^{234}U, ^{235 }U, ^{238}Pu and ^{239}Pu from a variety of reactions. Energy levels, moments-of-inertia, aligned angular momentum, Routhians, gamma-ray intensities, and cross-sections are presented for most cases. Additional spectroscopic information (magnetic moments, M1 over{E2} mixing ratios, and g-factors) is presented for ^{233}U. One - and two-neutron transfer reaction mechanisms and the possibility of band crossings (backbending) are discussed. A discussion of odd-A band fitting and Cranking calculations is presented to aid in the interpretation of rotational energy levels and alignment. In addition, several theoretical calculations of rotational populations for inelastic excitation and neutron transfer are compared to the data. Intratheory comparisons between the Sudden Approximation, Semi-Classical, and Alder-Winther-DeBoer methods are made. In connection with the theory development, the possible signature for the nuclear SQUID effect is discussed.