Speaker
Description
The MORA project (Matter’s Origin from Radioactivity) is an experimental setup dedicated to measure the triple-correlation parameter D in the nuclear beta decay of $^{23}$Mg and $^{39}$Ca. The $D$ correlation is a triple correlation between the spin of the decaying nucleus, the momentum of the emitted electron or positron, and the momentum of the emitted neutrino in mixed Fermi and Gamow-Teller transitions. The $D$ parameter is sensitive to physics beyond Standard Model, allowing to probe charge-parity (CP) violation mechanisms as a condition to matter-antimatter imbalance [1].
MORA consists of a transparent Paul trap and an octagonal arrangement of detectors mounted around it for positron and recoil ion detection. Trapped $^{23}$Mg ions are polarized with lasers and then let to decay while observing emitted particles. The degree of polarization is continuously monitored with silicon detectors [2].
In this contribution, the proof-of-principle of the in-trap laser polarization technique will be reported. The measurements were performed in the accelerator laboratory of University of Jyvaskyla, Finland, in IGISOL facility.
[1] A. Falkowski, A. Rodriquez-Sanchez, EPJC 82 (2022) 1134.
[2] N. Goyal et al., Performance of the MORA Apparatus for Testing Time-Reversal Invariance in Nuclear Beta Decay, arXiv:2504.16957v1 (2025).
| Classification | Ion traps and laser techniques |
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