Nuclear levels of ¹⁸³W studied with (n,^γ) and (d,p) reactions

The level structure of ¹⁸³W has been studied using gamma-gamma coincidences from thermal neutron capture in ¹⁸²W accompanied with the reaction (d,p). From these data and those of previous studies a total of 76 levels and about 490 connecting ^γ-transitions have been established for energies below 2.4 MeV. An analysis based on the standard distorted-wave Born approximation (DWBA) provides the lj-angular momentum transfers and spectroscopic factors for 36 levels up to 2.2 MeV excitation energy. A large number of particle transitions indicate an influence of strong mixing between particle and probably hole states. The extra exchange of phonons across the Fermi surface leads to a fine structure in the fragmentation of most single particle strengths and at the same time has the effect of breakdown of the individual properties of Nilsson states. The extracted l=1 and 2 (d,p) sum below 2 MeV has about the same magnitude as in ^185,187W. It comprises a rather small fraction of the expected strengths. The observed states below 2 MeV are compared with predictions of the quasiparticle-phonon model. Of particular interest is the identification of "quasi-bands" with inverse spin sequence based on the state 9/2+ at 622.8 keV; this indicates some transition aspects from rigid rotors of light W to ^γ-soft nuclei in the Os-Pt region.