Speaker
Description
The masses of lightest nuclei form a network of parameters used in fundamental physics. The mass difference of $\mathrm{T}$ and $^{3}\mathrm{He}$, for example, must be known with the highest precision to cross-check the systematic uncertainties in experiments
such as KATRIN or Project-8, which study $\beta$-decay of $\mathrm{T}$ to set a limit on the $\overline{\nu}_e$ mass. A Penning-trap measurement involving the bound electron $g$-factor can improve the precision of the atomic mass of the electron $A_r(e)$ if the mass of the reference nucleus, $^{4}\mathrm{He}$, is known with sufficient precision.
Penning trap mass measurements of the light nuclei have revealed
considerable inconsistencies between the values reported by different
experiments. To restore confidence in the literature values, the mass
spectrometer LIONTRAP has measured the masses of the proton [1],
the deuteron, the $\mathrm{HD}^+$ molecular ion [2], and most recently, $^{4}\mathrm{He}$ [3].
This contribution presents the preliminary results of the $^{3}\mathrm{He}$
mass measurement campaign, aimed at resolving the discrepancy among the
literature values known as the ''Light Ion Mass Puzzle''.
[1] F. Heisse $\textit{et al}$., Phys. Rev. A $\textbf{100}$, 022518 (2019)
[2] S. Rau $\textit{et al}$., Nature $\textbf{585}$, 43–47 (2020)
[3] S. Sasidharan $\textit{et al}$., Phys. Rev. Lett. $\textbf{131}$, 093201 (2023)
