Performance of the MORA Apparatus for Testing Time-Reversal Invariance in Nuclear Beta Decay

Publié le 1 octobre 2025 - The European physical journal. A, Hadrons and Nuclei

Auteurs : N Goyal, Abhilasha Singh, S Daumas-Tschopp, L.M Motilla Martinez, G Ban, V Bosquet, J.F Cam, P Chauveau, S Chinthakayala, G Frémont, R.P de Groote, F de Oliveira Santos, T Eronen, A Falkowski, X Fléchard, Z Ge, M González-Alonso, H Guérin, L Hayen, A Jaries, M Jbayli, A Jokinen, A Kankainen, B Kootte, R Kronholm, N Lecesne, Y Merrer, V Morel, M Mougeot, G Neyens, J Perronnel, M Reponen, A Raggio, S Rinta-Antila, A. Rodriguez - Sanchez, N Severijns, J.C Thomas, C Vandamme, S Vanlangendonk, V Virtanen, E Liénard, I.D Moore, P Delahaye

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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.