Hannover 2020 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 1: Precision Mass Spectrometry I

MS 1.1: Hauptvortrag

Montag, 9. März 2020, 11:00–11:30, f128

Precision Mass Measurements on light Nuclei: The Deuteron’s Atomic Mass — •Sascha Rau — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

The rest masses of many light nuclei, e.g. the proton, deuteron, triton and helion are of great importance for testing our current understanding of physics as well as in metrology. One example is the mass difference of triton and helion [1], which is used for systematic studies in the determination of m(νe) in the KATRIN experiment. However, the relatively large ratio of kinetic energies compared to the low rest masses makes measuring light ions especially challenging. 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.

In the contribution the present progress and results of LIONTRAP (Light ION TRAP) [2] will be presented, an ion trap setup dedicated to high-precision mass measurements of light ions. We recently measured the proton’s atomic mass by comparing the cyclotron frequencies of a single proton and a bare carbon nucleus, achieving a relative mass uncertainty of 3.2 × 10−11. Compared to the CODATA-2014 value our result is a factor of three more precise and reveals a 3σ deviation.

After upgrading the experiment we are currently measuring the deuteron’s atomic mass. These upgrades and the current status of the deuteron measurement campaign will be presented.

[1] E.G. Myers et al. Phys. Rev. Lett. 114, 013003 (2015)

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

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