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SAMOP 2021 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 1: Precision Mass Measurements I

MS 1.1: Hauptvortrag

Montag, 20. September 2021, 10:45–11:15, H3

Precision Mass Measurements on Light Nuclei: The Deuteron’s Atomic Mass — •Sascha Rau — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg

The rest masses of many light nuclei, e.g. the proton and the deuteron are of great importance for testing our current understanding of physics as well as in metrology. Recently discussed discrepancies in light ion mass measurements, carried out at different mass spectrometers and sometimes termed "light ion mass puzzle", give further motivation for independent measurements. Here I present progress and results of LIONTRAP (Light ION TRAP) [1], an ion trap setup dedicated to high-precision mass measurements of light ions, which has been constructed in an MPIK-GSI-University of Mainz collaboration. We recently measured the deuteron’s atomic mass by comparing the cyclotron frequencies of a single deuteron and a bare carbon nucleus, achieving a relative mass uncertainty of 8.5 × 10−12, a factor of 2.4 more precise than the CODATA-2014 value, and revealing a 4.8 σ deviation with respect to this value [2]. Together with the LIONTRAP mass measurements of the proton [1] and the HD+ molecular ion [2], as well as a measurement of the deuteron-to-proton mass ratio [3], this allows to determine the masses of the lightest nuclei with unprecedented precision. In this talk I will present these measurements and compare them with recent results from the spectroscopy of ro-vibrational states in HD+.

[1] F. Heiße et al., Phys. Rev. A 100, 022518 (2019)

[2] S. Rau et al. Nature 585, p. 43-47 (2020)

[3] D. J. Fink & E. G. Myers, Phys. Rev. Lett. 124, 013001 (2020)

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