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The reaction 32S(3He, α) 31S has been used to locate 42 levels in 31S. For 11 of the first 17 levels ℓn-values have been determined. The first 6 excited states of 31S have been studied by applying the particle-gamma correlation method of Litherland and Ferguson (their Method II) to the reaction 32S(3He, αγ) 31S. The resulting spins and parities are: EX, Jπ = 1.25 MeV, 3/2+; 2.23 MeV, 5/2+; 3.08 MeV, 1/2+; 3.29 MeV, 5/2+, 3/2+; 3.35 MeV, 7/2, 3/2; 3.44 MeV, 3/2+. Mixing and branching ratios have also been determined. The ground state Q-value for the reaction 32S(3He, α)31S has been measured to be 5.538 ± 0.006 MeV. Analysis of the spectra of the reaction 32S(3He, α)33Cl which were obtained as a by-product of the spectra of the reaction 32S(3He, α) 31S located levels in 33Cl at the following excitation energies: 0, 810 ± 9, (1978 ± 14), 2351 ± 9, 2686 ± 8, 2848 ± 9 (a known doublet), 2980 ± 9, and 4119 ± 10 keV. The 2.0 MeV level was only weakly populated, and to confirm its existence the reaction 36Ar(p, α)33Cl has been studied. In this reaction the 2.0 MeV level was strongly populated and the measured excitation energy was 1999 ± 20 keV. The experimental results for 31S and 33Cl are compared with their analogs and with nuclear model predictions. |
