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<p>Quantum electrodynamics has been tested to accuracies below the parts-per-trillion level in light-mass systems. However, tests in heavy-mass systems with a large nuclear charge have not yet reached similar accuracy. Here we report the hyperfine-structure splitting in the 1<i>s</i> ground state of radioactive hydrogen-like <sup>208</sup>Bi<sup>82+</sup>. We produced the isotope in a nuclear reaction and injected the beam into a storage ring to perform laser spectroscopy on samples of 10<sup>5</sup> ions of Bi<sup>82+</sup> that have only a single remaining electron, which experiences extreme magnetic-field strengths. Our result for the hyperfine splitting is in excellent agreement with the most accurate prediction based on a combination of quantum electrodynamics calculations with an empirical treatment of the hyperfine-structure anomaly ratio extracted from laser spectroscopy on neutral atoms of <sup>209</sup>Bi and <sup>208</sup>Bi. This achievement paves the way for the most stringent test of quantum electrodynamics in strong magnetic fields and demonstrates the feasibility of laser spectroscopy on other exotic ions with low production yields.</p>

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Storage-ring laser spectroscopy of accelerator-produced hydrogen-like 208Bi82+

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Max Horst,
  • Zoran Andelkovic,
  • Carsten Brandau,
  • Rui Jiu Chen,
  • David Freire Fernández,
  • Christopher Geppert,
  • Jan Glorius,
  • Volker Hannen,
  • Regina Heß,
  • Phillip Imgram,
  • Sebastian Klammes,
  • Kristian König,
  • Guy Leckenby,
  • Sergey Litvinov,
  • Yury A. Litvinov,
  • Bernd Lorentz,
  • Johann Meisner,
  • Konstantin Mohr,
  • Patrick Müller,
  • Stephan Passon,
  • Tim Ratajczyk,
  • Simon Rausch,
  • Jon Roßbach,
  • Rodolfo Sánchez,
  • Shahab Sanjari,
  • Ragandeep Singh Sidhu,
  • Uwe Spillmann,
  • Markus Steck,
  • Thomas Stöhlker,
  • Ken Ueberholz,
  • Christian Weinheimer,
  • Danyal Winters,
  • Wilfried Nörtershäuser

摘要

Quantum electrodynamics has been tested to accuracies below the parts-per-trillion level in light-mass systems. However, tests in heavy-mass systems with a large nuclear charge have not yet reached similar accuracy. Here we report the hyperfine-structure splitting in the 1s ground state of radioactive hydrogen-like 208Bi82+. We produced the isotope in a nuclear reaction and injected the beam into a storage ring to perform laser spectroscopy on samples of 105 ions of Bi82+ that have only a single remaining electron, which experiences extreme magnetic-field strengths. Our result for the hyperfine splitting is in excellent agreement with the most accurate prediction based on a combination of quantum electrodynamics calculations with an empirical treatment of the hyperfine-structure anomaly ratio extracted from laser spectroscopy on neutral atoms of 209Bi and 208Bi. This achievement paves the way for the most stringent test of quantum electrodynamics in strong magnetic fields and demonstrates the feasibility of laser spectroscopy on other exotic ions with low production yields.