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Showing 1–2 of 2 results
Advanced filters: Author: W. Vassen Clear advanced filters

  • A highly precise measurement of an optical transition in the helium atom has been obtained using state-of-the-art techniques. The result provides a stringent test of QED theory at low energy levels with tools of atomic physics.

    • R. J. Rengelink
    • Y. van der Werf
    • W. Vassen
    Research
    Nature Physics
    Volume: 14, P: 1132-1137

  • A stream of bosons tends to bunch together, whereas fermions avoid each other. Although evidence for each type of behaviour has been observed in various settings, no single experiment has been able to directly compare the two types of quantum statistics until now, where this paper reveals the contrasting behaviour of 3He (a fermion) and 4He (a boson) in the same apparatus.

    • T. Jeltes
    • J. M. McNamara
    • C. I. Westbrook
    Research
    Nature
    Volume: 445, P: 402-405