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The levels in 4 La have been studied following thermal-neutron capture in La using Ge(Li), Si(Li), curved-crystal, and coincidence spectrometers. The neutron binding energy of La was determined as 5161. 1 +1.0 keV. The data, when combined with the previous ' 9La-(d, p)" La study, allow the assignment of the first 14 states up to 581.060 keV to the mixed configurations kg»2 vfv&2 and md&&2vf7~2. The energies of states in keV (spin parity) are: 0 (3 ), 29.965 060 (0 ). Comparisons of p-ray branching ratios and (d, p) cross sections with the predictions of a quasiparticle model for odd-odd nuclei allow a relatively uncompromised solution for the state vectors for the first 14 states. The success of this model implies that there is little phonon or fourquasiparticle admixture through the level at 581.060 keV. A detailed experimental study of additional levels up to 1055 keV has been performed.

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