No-core shell model calculations for tritium show radial excitation contributions to the isospin-symmetry-breaking correction are negative and comparable to 10-20% of the diagonal contribution, suggesting shell-model δC2 values are likely overestimated.
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Radial excitations and their potential impact on Fermi $\beta$-decay rates
No-core shell model calculations for tritium show radial excitation contributions to the isospin-symmetry-breaking correction are negative and comparable to 10-20% of the diagonal contribution, suggesting shell-model δC2 values are likely overestimated.