The MORA experimental setup is designed to measure the triple-correlation D
parameter in nuclear beta decay. The D coefficient is sensitive to possible
violations of time-reversal invariance. The experimental configuration consists
of a transparent Paul trap surrounded by a detection setup with alternating
beta and recoil-ion detectors. The octagonal symmetry of the detection setup
optimizes the sensitivity of positron-recoil-ion coincidence rates to the D
correlation, while reducing systematic effects. MORA utilizes an innovative
in-trap laser polarization technique. The design and performance of the ion
trap, associated beamline elements, lasers and beta and recoil-ion detectors,
are presented. Recent progress towards the polarization proof-of-principle is
described.

Cet article explore les excursions dans le temps et leurs implications.

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