Abstract
The isospin mixing of the lowest two 1 + states in 12C is here considered. A nuclear charge symmetry breaking interaction (CSB) which was previously fitted to help explain the Nolen-Schiffer anomaly, goes in the right direction for this problem, but is not as important as in the N-S problem. An important effect is the mixing due to the one body Coulomb field. This is shown to be approximately proportional to (〈r 2〉 p 1 2 − 〈r 2〉 p 3 2 , a quantity which is very sensitive to the details of the one body nuclear potential.
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