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Description
The NEPTUNE collaboration is developing a new Penning ion trap aimed at precision spectroscopy of symmetry-violating electroweak effects using single trapped molecular ions [1]. The inherent strong magnetic field for ion confinement can be used to Zeeman-shift two opposite-parity molecular states into near degeneracy, increasing sensitivity to parity-violating nuclear properties by more than 11 orders of magnitude [2]. This approach is therefore expected to enable extremely sensitive measurements of symmetry-violating nuclear properties, such as anapole moments, across a wide range of nuclei. This contribution will summarize the current status of the cryogenic Penning trap for measurements in SiO⁺ and outline future prospects for the technique.
[1] J. Karthein, S. Udrescu, S. Moroch et al. Phys. Rev. Lett. 133, 033003 (2024)
[2] Altuntas, E. et al. Phys. Rev. Lett. 120, 142501 (2018)