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High-Precision Measurement of the Proton's Atomic Mass.

F Heiße1,2, F Köhler-Langes1, S Rau1

  • 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.

Physical Review Letters
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Summary
This summary is machine-generated.

Scientists precisely measured the atomic mass of a single proton using a Penning-trap system. This new measurement offers a threefold improvement over current values and shows a significant deviation from established data.

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Area of Science:

  • Atomic Physics
  • Metrology

Background:

  • Accurate knowledge of fundamental particle masses is crucial for physics.
  • Existing measurements of the proton mass have limitations in precision.

Purpose of the Study:

  • To achieve a more precise measurement of the proton's atomic mass.
  • To refine the CODATA (Committee on Data for Science and Technology) recommended values.

Main Methods:

  • Utilized a custom-built Penning-trap system for high-precision measurements.
  • Employed advanced techniques for isolating and measuring a single proton.

Main Results:

  • Achieved a measurement precision of 32 parts per trillion.
  • The new value improves upon the CODATA literature value by a factor of 3.
  • Observed a disagreement with the CODATA value at approximately 3 standard deviations.

Conclusions:

  • The precise proton mass measurement challenges current accepted values.
  • Further investigation is warranted to understand the discrepancy with CODATA.
  • This result has implications for fundamental constants and physics models.