Nuclear Charge Radius of 26mAl and Its Implication for Vud in the Quark Mixing 
Matrix

Plattner, P.; Wood, E.; Al Ayoubi, L.; Beliuskina, O.; Bissell, M. L.; Blaum, K.; Campbell, P.; Cheal, B.; de Groote, R. P.; Devlin, C. S.; Eronen, T.; Filippin, L.; Garcia Ruiz, R. F.; Ge, Z.; Geldhof, S.; Gins, W.; Godefroid, M.; Heylen, H.; Hukkanen, M.; Imgram, P.; Jaries, A.; Jokinen, A.; Kanellakopoulos, A.; Kankainen, A.; Kaufmann, S.; König, K.; Koszorús, Á.; Kujanpää, S.; Lechner, S.; Malbrunot-Ettenauer, S.; Müller, †P.; Mathieson, R.; Moore, I.; Nörtershäuser, W.; Nesterenko, D.; Neugart, R.; Neyens, G.; Ortiz-Cortes, A.; Penttilä, H.; Pohjalainen, I.; Raggio, A.; Reponen, M.; Rinta-Antila, S.; Rodríguez, L. V.; Romero, J.; Sánchez, R.; Sommer, F.; Stryjczyk, M.; Virtanen, V.; Xie, L.; Xu, Z. Y.; Yang, X. F.; Yordanov, D. T.

doi:10.1103/PhysRevLett.131.222502

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Nuclear Charge Radius of ^26mAl and Its Implication for V_ud in the Quark Mixing Matrix

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Plattner, P.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum, K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Heylen, H.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Neugart, R.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Rodríguez, L. V.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.131.222502
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Citation

Plattner, P., Wood, E., Al Ayoubi, L., Beliuskina, O., Bissell, M. L., Blaum, K., et al. (2023). Nuclear Charge Radius of ^26mAl and Its Implication for V_ud in the Quark Mixing Matrix. Physical Review Letters, 131(22): 222502. doi:10.1103/PhysRevLett.131.222502.

Cite as: https://hdl.handle.net/21.11116/0000-000D-FB77-3

Abstract

Collinear laser spectroscopy was performed on the isomer of the aluminium isotope ^26mAl. The measured isotope shift to ²⁷Al in the 3s²3p ^²P_3/2^○→3s²4s ²S_1/2 atomic transition enabled the first experimental determination of the nuclear charge radius of ^26mAl, resulting in Rc=3.130(15) fm. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed β decay of ^26mAl. Its corrected Ft value, important for the estimation of V_ud in the Cabibbo-Kobayashi-Maskawa matrix, is thus shifted by 1 standard deviation to 3071.4(1.0) s.