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.
Fundamental Symmetries, Neutrons, and Neutrinos (FSNN): Whitepaper for the 2023 NSAC Long Range Plan
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This whitepaper presents the research priorities decided on by attendees of the 2022 Town Meeting for Fundamental Symmetries, Neutrons and Neutrinos, which took place December 13-15, 2022 in Chapel Hill, NC, as part of the Nuclear Science Advisory Committee (NSAC) 2023 Long Range Planning process. A total of 275 scientists registered for the meeting. The whitepaper makes a number of explicit recommendations and justifies them in detail.
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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.