Abstract
The microscopic structure of both the Gamow-Teller resonance (GTR) at E χ = 15.6 MeV and the spin-flip ΔL=1 resonances at higher excitation energies in 208Bi has been investigated by observing their direct proton decay to the 3 p 1 2 , 2f 5 2 , 3 p 3 2 , 1 i 3 2 and 2f 7 2 neutron-hole states in 207Pb, following their excitation via the 208Pb ( 3He,t) reaction at E( 3 He) = 450 MeV . Decay protons were measured at backward angles in coincidence with tritons detected at very forward angles including θ = 0°. The total widths of the resonances as well as total and partial proton escape widths were determined and compared to theoretical estimates for the GTR. Using the same experimental set-up and conditions proton decay of the spin-flip ΔL=1 resonances in 12C was also measured.
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