Coulomb excitation ofW183

Abstract

Direct E2 and multiple Coulomb excitation of states up to J=9/2 in the K=1/2 and K=3/2 bands of /sup 183/W has been measured by means of ..gamma..-ray spectroscopy. Excitation was produced by 15-MeV /sup 4/He 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 (..cap alpha..,..cap alpha..') reaction on /sup 183/W with 13-MeV /sup 4/He ions using a split-pole magnetic spectrometer equipped with a position-sensitive proportional detector. The B (E2) values for excitation of the 3/2/sup L/, 5/2/sup L/, 3/2/sup H/, and 5/2/sup H/ 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 3/2/sup H/ ..-->.. 1/2/sup L/, 3/2/sup H/ ..-->.. 5/2/sup L/, and 5/2/sup H/ ..-->.. 5/2/sup L/ 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 statesmore » between 0.9 and 1.5 MeV were observed and the B (E2) for excitation of these states are < or = B (E2)/sub s.p./.« less