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Showing 1–9 of 9 results
Advanced filters: Author: Paul Indelicato Clear advanced filters

  • Niels Bohr's model of the structure of the atom raised the question of how large an atom can be. One hundred years on, the issue is still unresolved. Two physicists discuss the theoretical limits of atomic and nuclear size.

    • Paul Indelicato
    • Alexander Karpov
    News & Views
    Nature
    Volume: 498, P: 40-41

  • The 2S–2P transitions in muonic helium-4 ions are measured using laser spectroscopy and used to obtain an α-particle charge-radius value five times more precise than that from electron scattering.

    • Julian J. Krauth
    • Karsten Schuhmann
    • Franz Kottmann
    ResearchOpen Access
    Nature
    Volume: 589, P: 527-531

  • An experiment sensitive to higher-order quantum electrodynamics effects and electron–electron interactions in the high-Z regime was performed using a multi-reference method based on Doppler-tuned X-ray emission from stored relativistic uranium ions with different charge states.

    • R. Loetzsch
    • H. F. Beyer
    • M. Trassinelli
    ResearchOpen Access
    Nature
    Volume: 625, P: 673-678

  • Here, a technically challenging spectroscopic experiment is described: the measurement of the muonic Lamb shift. The results lead to a new determination of the charge radius of the proton. The new value is 5.0 standard deviations smaller than the previous world average, a large discrepancy that remains unexplained. Possible implications of the new finding are that the value of the Rydberg constant will need to be revised, or that the validity of quantum electrodynamics theory is called into question.

    • Randolf Pohl
    • Aldo Antognini
    • Franz Kottmann
    Research
    Nature
    Volume: 466, P: 213-216

  • Advances in superheavy element studies providing insight into the nuclear and atomic structure and the chemical behaviour of these exotic short-lived systems will help push to the limit of the periodic table of elements and revise the concept of the island of stability.

    • Odile R. Smits
    • Christoph E. Düllmann
    • Peter Schwerdtfeger
    Reviews
    Nature Reviews Physics
    Volume: 6, P: 86-98