Abstract
The first five excited states of 28Mg have been studied by observing γ-rays from the 26Mg(t,pγ) 28Mg reaction, in coincidence with protons, in NaI(Tl) and Ge(Li) detectors, at incident energies between 2.5 and 3.2 MeV. Doppler-shift attenuation measurements lead to the mean-lives τ m = 2.0±0.4 ps, 1.1±0.3 ps and 96±30 fs for the levels at 1.47, 3.86 and 4.02 MeV, respectively, and to upper limits of τ m < 50 fs and < 120 fs for the levels at 4.56 and 4.88 MeV. Angular correlation measurements (method II) were used to determine spins, mixing ratios and γ-branching ratios. The 4.02 MeV level has most probably J γ = 4 +.
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