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ISOLDE Workshop and Users meeting 2022

30 November 2022 to 2 December 2022
CERN
Europe/Zurich timezone

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The Charge Radius of 26,26mAl

2 Dec 2022, 11:30
12m
503/1-001 - Council Chamber (CERN)

503/1-001 - Council Chamber

CERN

162
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Submitted oral (In person) Atomic Techniques for Fundamental Physics

Speaker

Peter Plattner (Max Planck Society (DE))

Description

In the study of atomic nuclei, nuclear charge radii provide intriguing physics insights into the evolution of nuclear structure far away from stability and pairing effects [1, 2]. Furthermore, charge radii have been used as experimental input for the determination of $V_{ud}$ of the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix from superallowed nuclear β-decays [3]. In the Standard model of particle physics, the CKM matrix is predicted to be unitary but recent reviews of the matrix values [4] show a 2.2$\sigma$ deviation for one of its unitarity tests, with the highest numerical contribution coming from $V_{ud}$.
This contribution will present the recent work of combined measurements of the charge radii of $^{26,26m}$Al by means of Collinear Laser Spectroscopy (CLS) at the COLLAPS experiment at ISOLDE and at the IGISOL facility in Jyväskylä, Finland. CLS takes advantage of the interaction between the atomic nucleus and its surrounding electrons giving rise to the hyperfine structure. Thus, properties of nuclear ground states and long-lived isomers, including nuclear charge radii, can be inferred from measured hyperfine spectra. Prior to the present work, the charge radius of the superallowed β emitter 26mAl was not known experimentally but had to be extrapolated from known nuclear charge radii to evaluate the theoretical isospin symmetry breaking (ISB) correction required for the determination of Vud.
The present measurements reveal a charge radius of 26mAl which differs by more than 4 standard deviations from the value assumed in previous ISB calculations.

References
[1] M. L. Bissell, J. Papuga, H. Naïdja, K. Kreim, K. Blaum, M. D. Rydt, R. F. G. Ruiz, H. Heylen, M. Kowalska, R. Neugart, G. Neyens, W. Nörtershäuser, F. Nowacki, M. M. Rajabali, R. Sanchez, K. Sieja, D. T. Yordanov, Physical Review Letters 2014, 113, 052502.

[2] A. Koszorus, L. Vormawah, R. Beerwerth, M. Bissell, P. Campbell, B. Cheal, C. Devlin, T. Eronen, S. Fritzsche, S. Geldhof, H. Heylen, J. Holt, A. Jokinen, S. Kelly, I. Moore, T. Miyagi, S. Rinta-Antila, A. Voss, C. Wraith, Physics Letters B 2021, 819, DOI 10.1016/j.physletb.2021.136439.

[3] J. C. Hardy, I. S. Towner, Physical Review C 2020, 102, DOI 10.1103/PhysRevC.102.045501.

[4] R. L. Workman et al., PTEP 2022, 2022, 083C01.

Author

Peter Plattner (Max Planck Society (DE))

Co-authors

A. Jaries (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) A. Jokinen (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) A. Ortiz-Cortes (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) A. Raggio (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) Dr Agota Koszorus (CERN) Anu Kankainen (University of Jyväskylä) Bradley Cheal (University of Liverpool (GB)) Charlie Stuart Devlin (University of Liverpool (GB)) Deyan Yordanov (Université Paris-Saclay (FR)) Dmitrii Nesterenko (University of Jyväskylä) E. Wood (University of Liverpool Department of Physics, Liverpool, United Kingdom) Gerda Neyens (KU Leuven) H. Penttila (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) Hanne Heylen (CERN) I. Pohjalainen (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) Iain Moore J. Romero (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) Jason Holt Klaus Blaum (Max-Planck-Institut für Kernphysik, Heidelberg) Kristian Koenig L. Al Ayoubi (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) L. Filippin (Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Universit´e libre de Bruxelles, Brussels, Belgium) L. Xie (Department of Physics Astronomy, University of Manchester, Manchester, United Kingdom) Liss Vazquez Rodriguez (Max Planck Society (DE)) M. Godefroid (Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Universit´e libre de Bruxelles, Brussels, Belgium) M. Stryjczyk (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) Marjut Hukkanen (University of Jyväskylä and CENBG) Mark Bissell (University of Manchester (GB)) Mikael Reponen (University of Jyväskylä) O. Beliuskina (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) Patrick Matthias Muller (Technische Universitaet Darmstadt (DE)) Paul Campbell (University of Manchester (GB)) Phillip Imgram (Technische Universitaet Darmstadt (DE)) R. Mathieson (University of Liverpool Department of Physics, Liverpool, United Kingdom) R. Sanchez (GSI Helmholtzzentrum f¨ ur Schwerionenforschung, Darmstadt, Germany) Rainer Neugart (Max Planck Society (DE)) Ronald Fernando Garcia Ruiz Ruben Pieter De Groote (KU Leuven (BE)) S. Rinta-Antila (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) Sarina Geldhof (Centre National de la Recherche Scientifique (FR)) Simon Kaufmann (Technische Universitaet Darmstadt (DE)) Dr Simon Lechner (McGill University) Sonja Pirita Kujanpää Stephan Malbrunot (TRIUMF (CA)) T. Miyagi (Institut f¨ ur Kernphysik, Technische Universit¨ at Darmstadt, Darmstadt, Germany) Dr Tassos Kanellakopoulos (HEPIA - Haute école du paysage, d'ingénierie et d'architecture (CH)) Tommi Eronen (Helsinki Institute of Physics HIP) V. Virtanen (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) Wilfried Noertershaeuser (Technische Universitaet Darmstadt (DE)) Dr Wouter Gins (University of Jyvaskyla (FI)) X. F. Yang (Institute for Nuclear and Radiation Physics, KU Leuven, Leuven, Belgium) Z. Ge (Department of Physics, University of Jyv¨askyl¨a, Jyv¨askyl¨a, Finland) Z. Y. Xu (Institute for Nuclear and Radiation Physics, KU Leuven, Leuven, Belgium)

Presentation materials

plattner_aluminium26m_ISOLDE_workshop_redacted.pdf
plattner_aluminium26m_ISOLDE_workshop_redacted.pptx
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