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This study reevaluates the nuclear charge radius of lead-208 using muonic spectroscopy. New analysis significantly reduces anomalies and suggests current compilation data may underestimate the true charge radius.

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Area of Science:

  • Nuclear Physics
  • Atomic Physics
  • Quantum Electrodynamics

Background:

  • The nuclear charge radius of heavy nuclei is crucial for understanding nuclear structure.
  • Previous measurements for lead-208 using muonic spectroscopy had associated anomalies.

Purpose of the Study:

  • To reevaluate the root-mean-square nuclear charge radius of doubly magic ^{208}Pb.
  • To reduce the long-standing muonic fine-structure anomaly and improve data analysis.
  • To provide a more accurate and reliable value for the nuclear charge radius.

Main Methods:

  • Utilized muonic spectroscopy measurements for ^{208}Pb.
  • Integrated rigorous theoretical quantum electrodynamics calculations.
  • Employed state-of-the-art numerical methods and systematic reanalysis of uncertainties.

Main Results:

  • Reduced the muonic fine-structure anomaly by a factor of 20.
  • Obtained a Fermi distribution charge radius of 5.5062(5) fm.
  • The new value is 3 standard deviations larger than commonly used compilation data, suggesting underestimation.

Conclusions:

  • The reevaluated ^{208}Pb rms charge radius is 5.5062(17) fm with reduced model dependence.
  • This work establishes an improved benchmark for charge radius extraction in heavy nuclei.
  • Paves the way for systematic reevaluations of nuclear charge radii across the nuclear chart.