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

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arxiv 2504.16957 v1 pith:VLCU4U56 submitted 2025-04-22 physics.ins-det nucl-ex

classification physics.ins-detnucl-ex
keywords betamorasetupdecaydetectiondetectorsexperimentalinvariance
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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