Abstract
We observe a yield to the 1 + T = 1 level in 12C at 15.11 MeV in the isospin forbidden 12C(d, d') and 10B(α, d) reactions at about 1 % of the yield to the 1 + T = 0 level at 12.71 MeV. Observed yields to the T = 12 + level at 16.11 MeV in both reactions at about half the yield to the 15.11 MeV level preclude attributing this observed isospin violation entirely to final state mixing. From the ratios of the spectroscopic factors for the 12.71 and 15.11 MeV levels in 12C and the ground state of 12B from the 13C(d, t) and 13C(d, 3He) reactions, we find a charge dependent matrix element between the 1 + states in 12C of 179 ± 75 keV.
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