Isotopic spin selection rules IX: The 9.58 MeV state of 16O

Abstract The reaction 12C(α, γ)16O through the 1–state of 16O at 9.58 MeV is detected and the radiative width measured as 6 MeV. This corresponds to ∥M∥2 = 1 × 10×5 in Weisskopf units or to a contamination of the predominantly T = 0 state with T = 1 or the ground state with T = 1 of α0 2(1)×3∼10×4. Alternatively if the transition is ascribed to a mixing-in by the Coulomb perturbation of the T = 1 state at 13.09 MeV we find HC∼0.035 MeV.