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Author  |
König, K.; Müller, P.; Gesser, T.; Burbach, E.; Gandolfi, S.; Heinz, M.; Imgram, P.; Lovato, A.; Maris, P.; Miyagi, T.; Nörtershäuser, W.; Roth, R.; Schwenk, A.; Spahn, J. |
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Title |
Accurate Charge Radius Measurement of 14C Confronts Ab Initio Theory |
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Journal Article |
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Year |
2026 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
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Volume |
137 |
Issue |
18 |
Pages |
182501 - 10pp |
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Abstract |
Located at the neutron shell closure N = 8, the long-lived radioactive isotope 14C plays a critical role in geochronology and nuclear structure studies. Despite its widespread use, the nuclear charge radius of 14C has remained less precisely known than that of its stable counterpart 12C. Here, we report a high-precision determination of the 14C charge radius using collinear laser spectroscopy at the COALA setup at TU Darmstadt, improving upon the precision of previous muonic measurements by a factor of 5 and revealing a 1.9 sigma discrepancy of combined uncertainty, indicating a likely underestimated uncertainty in the muonic determination. This measurement challenges state-of-the-art ab initio nuclear theory calculations, including auxiliary field diffusion Monte Carlo, the valence-space in-medium similarity renormalization group, and the no-core shell model, augmented by neural-network techniques. With 12C and 14C now forming one of the most precisely characterized even-even isotope pairs, these results also enable improved QED tests. |
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Address |
[Konig, Kristian; Muller, Patrick; Gesser, Tobias; Burbach, Emily; Imgram, Phillip; Nortershauser, Wilfried; Roth, Robert] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany, Email: kkoenig@ikp.tu-darmstadt.de |
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Publisher |
Amer Physical Soc |
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Language |
English |
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ISSN |
0031-9007 |
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Notes |
WOS:001925761300002 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7520 |
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