Levels of³³S excited by α-capture reactions

Highly excited levels of³³S populated by α-particle capture in²⁹Si have been investigated for E_α=1.962 MeV to 4.287 MeV. Excitation curves measured with Ge(Li) and BF₃ detectors are reported. More than fifty resonances can be identified with levels in³³S. (α, γ) angular distributions measured on five strong resonances have yielded J^π values 1/2+, 3/2 +, 5/2-, 5/2-, 5/2- and 3/2+ respectively, for the E_x=10.054, 10.466, 10.523, 10.721, 10.758 and 10.776 MeV levels in³³S. Elastic scattering experiments have been performed and the J^π assignments are found to be consistent with the l-values inferred from the elastic scattering data. Decay schemes from the above³³S levels have been proposed. A new level at 9.245 MeV is also suggested and the J^π values for the 4.425 and 2.87 MeV states are shown to be consistent with 7/2+ and 3/2+ assignment, respectively. Nuclear Reactions²⁹Si(α, γ) and²⁹Si(α, α), E_α=1.962-4.287 MeV. Measured relative σ(E). Deduced J^π and E_γ of³³S levels. New³³S level at E_x=9.245 MeV. Enriched targets.