Coulomb excitation of W183

Direct E2 and multiple Coulomb excitation of states up to J=92 in the K=12 and K=32 bands of W183 has been measured by means of γ-ray spectroscopy. Excitation was produced by 15-MeV He4 ions on a thick target of W with natural abundance. Excitation probabilities were also determined relative to the elastic scattering by the observation of the (α,α′) reaction on W183 with 13-MeV He4 ions using a split-pole magnetic spectrometer equipped with a position-sensitive proportional detector. The B(E2) values for excitation of the 32L, 52L, 32H, and 52H states (H and L refer to the high and low energy states of the same total angular momentum J) are obtained and information is given on the reduced transition probabilities for the different decay modes of these states. In particular, the prediction of strong cancellation in the E2 transition probabilities for the 32H→12L, 32H→52L, and 52H→52L transitions from Coriolis interaction calculations has been verified by the experimental results. The experimental results are compared with several calculations of the Coriolis coupling between the rotational bands. Several weakly excited states between 0.9 and 1.5 MeV were observed and the B(E2) for excitation of these states are ≤B(E2)s.p.. NUCLEAR REACTIONS W183(α, α′γ), E=15 MeV, W183(α, α′), E=13 MeV; measured Eγ, Iγ, γ(θ), σ(Eα′; θ=150); W183 levels deduced B(E2), B(M1), Jπ, δ. Enriched target.