β-decay and the electric dipole moment: searches for time-reversal violation in radioactive nuclei and atoms

Wilschut, Hans; Hoek, D.J. van der; Jungmann, K.; Kruithof, W.; Onderwater, C. J. G.; Santra, B.; Shidling, P.; Willmann, Lorenz

doi:10.1016/j.nuclphysa.2010.05.025

Cited by 10 publications

(10 citation statements)

References 41 publications

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“…A subset of that broad area of endeavor is the search for permanent electric dipole moments (EDMs), and a subset within that focuses on electrons (eEDMs). For comparative surveys of the discovery potential of various EDM studies see [63][64][65][66][67], we summarize here by saying that from the point of view of new physics, experiments on leptons provide physics constraints complementary to those on diatomic atoms and to those directly on bare nucleons and nuclei. As for the lepton experiments, there is work on the tau lepton [68], on muons [51,52] and of course on electrons as discussed in some detail below.…”

Section: A Comparative Survey Of Ongoing Experimental Workmentioning

confidence: 99%

“…The current best atomic dipole measurement is an experiment is in the diamagnetic species, Hg, by the Washington group [73]. Many other groups are looking for EDMs in diamagnetic (that is, net electron spin S = 0), ground-state electronic levels in Hg [73], Xe [74][75][76][77], Rn [78], Yb [79] and Ra [67,[80][81][82]. Experiments on diamagnetic atoms (with net electron spin S = 0) are sensitive to new physics predominantly via the nucleonic contribution to the Schiff moment of the corresponding atomic nucleus.…”

Section: A Comparative Survey Of Ongoing Experimental Workmentioning

confidence: 99%

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High-resolution spectroscopy on trapped molecular ions in rotating electric fields: A new approach for measuring the electron electric dipole moment

Leanhardt

Bohn

Loh

et al. 2011

Journal of Molecular Spectroscopy

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High-resolution molecular spectroscopy is a sensitive probe for violations of fundamental symmetries. Symmetry violation searches often require, or are enhanced by, the application of an electric field to the system under investigation. This typically precludes the study of molecular ions due to their inherent acceleration under these conditions. Circumventing this problem would be of great benefit to the high-resolution molecular spectroscopy community since ions allow for simple trapping and long interrogation times, two desirable qualities for precision measurements. Our proposed solution is to apply an electric field that rotates at radio frequencies. We discuss considerations for experimental design as well as challenges in performing precision spectroscopic measurements in rapidly time-varying electric fields. Ongoing molecular spectroscopy work that could benefit from our approach is summarized. In particular, we detail how spectroscopy on a trapped diatomic molecular ion with a ground or metastable 3 ∆1 level could prove to be a sensitive probe for a permanent electron electric dipole moment (eEDM).

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Section: A Comparative Survey Of Ongoing Experimental Workmentioning

confidence: 99%

Section: A Comparative Survey Of Ongoing Experimental Workmentioning

confidence: 99%

High-resolution spectroscopy on trapped molecular ions in rotating electric fields: A new approach for measuring the electron electric dipole moment

Leanhardt

Bohn

Loh

et al. 2011

Journal of Molecular Spectroscopy

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“…An experiment at KVI-Groningen to measure the P-even coefficient D in 21 Na decay through the use of a double-MOT setup is in preparation (119). The atoms will be prepared in a small collection trap and then transferred to a second, larger MOT.…”

Section: Fivefold Correlationsmentioning

confidence: 99%

Symmetry Tests in Nuclear Beta Decay

Severijns

Naviliat‐Cuncic

2011

Annu. Rev. Nucl. Part. Sci.

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Precision measurements in nuclear β decay provide sensitive means to test the structure of the standard electroweak model; they also allow the determination of fundamental properties in processes that involve the lightest quarks. The primary aim of such tests is to find deviations from the Standard Model predictions that may indicate new physics. We review here the status of precision measurements in nuclear β decay, including selected experiments in neutron decay, and discuss recent results and developments. Among these developments are the consideration of nuclear mirror transitions as a new window in which to test the unitarity condition of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix, measurements of angular correlation observables to search for exotic couplings, and tests of discrete symmetries.

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“…Experimental programmes are in place to measure EDMs in atoms of odd-A Rn and Ra isotopes in the octupole region (see, for example, Ref. [42,43]) but so far there is little direct information on octupole correlations in these nuclei. The recent measurements of Q 3 values in 220 Rn and 224 Ra are consistent with suggestions from the systematic studies of energy levels [1] that the even-even isotopes 218−222 Rn and 220 Ra have vibrational behaviour while 222−228 Ra have octupole-deformed character.…”

Section: Discussionmentioning

confidence: 99%

Pear-shaped Nuclei: Nuclear Models and the Standard Model

Butler¹

2014

Acta Phys. Pol. B

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For certain combinations of protons and neutrons, there is a theoretical expectation that the shape of nuclei can assume octupole deformation, which would give rise to reflection asymmetry or a "pear shape" in the intrinsic frame, either dynamically (octupole vibrations) or statically (permanent octupole deformation). In this paper, I will briefly review the historic evidence for reflection asymmetry in nuclei, describe how recent experiments carried out at REX-ISOLDE are constraining nuclear theory and how they contribute to tests of extensions of the Standard Model, and look at future prospects for this field.

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β-decay and the electric dipole moment: searches for time-reversal violation in radioactive nuclei and atoms

Cited by 10 publications

References 41 publications

High-resolution spectroscopy on trapped molecular ions in rotating electric fields: A new approach for measuring the electron electric dipole moment

High-resolution spectroscopy on trapped molecular ions in rotating electric fields: A new approach for measuring the electron electric dipole moment

Symmetry Tests in Nuclear Beta Decay

Pear-shaped Nuclei: Nuclear Models and the Standard Model

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