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Nuclear Charge Radius of Al26m and Its Implication for Vud in the Quark Mixing Matrix

P. Plattner1,2,3,*, E. Wood4, L. Al Ayoubi5, O. Beliuskina5, M. L. Bissell6,1, K. Blaum3, P. Campbell6, B. Cheal4, R. P. de Groote5,‡ et al.

C. S. Devlin4, T. Eronen5, L. Filippin7, R. F. Garcia Ruiz1,8, Z. Ge5, S. Geldhof9, W. Gins5, M. Godefroid7, H. Heylen1,3, M. Hukkanen5, P. Imgram10, A. Jaries5, A. Jokinen5, A. Kanellakopoulos9, A. Kankainen5, S. Kaufmann10, K. König10, Á. Koszorús4,9,‡, S. Kujanpää5, S. Lechner1, S. Malbrunot-Ettenauer1,11,†, P. Müller10, R. Mathieson4, I. Moore5, W. Nörtershäuser10, D. Nesterenko5, R. Neugart3,12, G. Neyens1,9, A. Ortiz-Cortes5, H. Penttilä5, I. Pohjalainen5, A. Raggio5, M. Reponen5, S. Rinta-Antila5, L. V. Rodríguez3,1,13, J. Romero5, R. Sánchez14, F. Sommer10, M. Stryjczyk5, V. Virtanen5, L. Xie6, Z. Y. Xu9, X. F. Yang9,15, and D. T. Yordanov13

  • 1ISOLDE, CERN Experimental Physics Department, Geneva 23, 1211 Genevè, Switzerland
  • 2Universität Innsbruck, Innrain 52, 6020 Innsbruck, Austria
  • 3Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
  • 4Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 5Department of Physics, University of Jyväskylä, P.O. Box 35 FI-40014, Jyväskylä, Finland
  • 6Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
  • 7Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Université libre de Bruxelles, 1050 Brussels, Belgium
  • 8Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, Massachusetts 02139, USA
  • 9Instituut voor Kern- en Stralingsfysica, KU Leuven, 3001 Leuven, Belgium
  • 10Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
  • 11TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
  • 12Institut für Kernchemie, Universität Mainz, Fritz-Straßmann-Weg 2, 55128 Mainz, Germany
  • 13IJCLab, CNRS/IN2P3, Université Paris-Saclay, 91400 Orsay, France
  • 14GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
  • 15School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, 209 Chengfu Road, 100871 Beijing, China

  • *Corresponding author: peter.plattner@cern.ch
  • †Corresponding author: stephan.ettenauer@cern.ch
  • ‡Present address: Instituut voor Kern- en Stralingsfysica, KU Leuven, 3001 Leuven, Belgium.
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Phys. Rev. Lett. 131, 222502 – Published 27 November, 2023

DOI: https://doi.org/10.1103/PhysRevLett.131.222502

Abstract

Collinear laser spectroscopy was performed on the isomer of the aluminium isotope Al26m. The measured isotope shift to Al27 in the 3s23p P3/2○2→3s24s S1/22 atomic transition enabled the first experimental determination of the nuclear charge radius of Al26m, 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 Al26m. Its corrected Ft value, important for the estimation of Vud in the Cabibbo-Kobayashi-Maskawa matrix, is thus shifted by 1 standard deviation to 3071.4(1.0) s.

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Physics Subject Headings (PhySH)

Viewpoint

Quark Picture Put to the Test

Published 27 November, 2023

A measurement of the charge radius of an aluminum nucleus probes the assumption that there are only three families of quarks.

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Phys. Rev. Lett. 131, 222502– Published 27 November, 2023
  • Received 25 July 2023
  • Accepted 9 October 2023
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