Performance of the MORA apparatus for testing time-reversal invariance in nuclear beta decay

IF 2.8 3区物理与天体物理 Q2 PHYSICS, NUCLEAR

The European Physical Journal A Pub Date : 2025-10-01 DOI:10.1140/epja/s10050-025-01694-3

N. Goyal, A. 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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Abstract

The MORA experimental setup is designed to measure the triple-correlation \(D\) parameter in the nuclear beta decay of trapped and polarized \(^{23}\)Mg\(^+\) and \(^{39}\)Ca\(^+\) ions. The \(D\) coefficient is sensitive to potential violations of time-reversal invariance – and, via the CPT theorem, to CP violation. 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 and associated optics, lasers and \(\beta \) and detection system are presented. The recent experimental demonstration of the polarization technique is described.

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核衰变时间反转不变性MORA测试装置的性能

MORA实验装置设计用于测量捕获和极化\(^{23}\) Mg \(^+\)和\(^{39}\) Ca \(^+\)离子的核β衰变的三重相关\(D\)参数。\(D\)系数对时间反转不变性的潜在违反很敏感，并且，通过CPT定理，对CP违反很敏感。实验结构包括一个透明的保罗陷阱，周围环绕着一个交替的\(\beta \)和反冲探测器的探测装置。探测装置的八角形对称性优化了正电子-反冲-离子符合率对\(D\)相关的灵敏度，同时降低了系统效应。MORA采用了一种创新的阱内激光偏振技术。介绍了离子阱及其相关光学器件、激光器、\(\beta \)和检测系统的设计和性能。介绍了偏振技术的最新实验证明。

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来源期刊

The European Physical Journal A 物理-物理：核物理

CiteScore

5.00

自引率

18.50%

发文量

216

审稿时长

3-8 weeks

期刊介绍： Hadron Physics Hadron Structure Hadron Spectroscopy Hadronic and Electroweak Interactions of Hadrons Nonperturbative Approaches to QCD Phenomenological Approaches to Hadron Physics Nuclear and Quark Matter Heavy-Ion Collisions Phase Diagram of the Strong Interaction Hard Probes Quark-Gluon Plasma and Hadronic Matter Relativistic Transport and Hydrodynamics Compact Stars Nuclear Physics Nuclear Structure and Reactions Few-Body Systems Radioactive Beams Electroweak Interactions Nuclear Astrophysics Article Categories Letters (Open Access) Regular Articles New Tools and Techniques Reviews.