Precise measurement of magnetic field gradients from free spin precession signals of 3He and 129Xe magnetometers

Allmendinger, F.; Blümler, Peter; Doll, Monica Pacheco; Grasdijk, Olivier; Heil, W.; Jungmann, Klaus-Peter; Karpuk, S.; Krause, Hans‐Joachim; Offenhäusser, Andreas; Repetto, M.; Schmidt, Ulrich; Sobolev, Yu.; Tullney, K.; Willmann, Lorenz; Zimmer, S.

doi:10.1140/epjd/e2017-70505-4

Cited by 15 publications

(9 citation statements)

References 26 publications

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“…The fully automated optimization procedure takes several hours, improving T * 2,He from 7500 s to 40000 s. This measure finally led to a reduction of gradients from 50 pT/cm to below 10 pT/cm. In [39], we described the precise measurements of magnetic field gradients extracted from transverse relaxation rates of precessing spin samples. This method has the advantage that an EDM-measurement run can directly follow the gradient optimization procedure without any modifications of the setup (like opening the magnetic shield, for instance).…”

Section: F Technique: Demagnetization and Gradient Optimizationmentioning

confidence: 99%

Measurement of the permanent electric dipole moment of the Xe129 atom

et al. 2019

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We report on a new measurement of the CP-violating permanent Electric Dipole Moment (EDM) of the neutral 129 Xe atom. Our experimental approach is based on the detection of the free precession of co-located nuclear spin-polarized 3 He and 129 Xe samples. The EDM measurement sensitivity benefits strongly from long spin coherence times of several hours achieved in diluted gases and homogeneous weak magnetic fields of about 400 nT. A finite EDM is indicated by a change in the precession frequency, as an electric field is periodically reversed with respect to the magnetic guiding field. Our result, (−4.7 ± 6.4) · 10 −28 ecm, is consistent with zero and is used to place a new upper limit on the 129 Xe EDM: |dXe| < 1.5 · 10 −27 ecm (95% C.L.). We also discuss the implications of this result for various CP-violating observables as they relate to theories of physics beyond the standard model.

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Section: F Technique: Demagnetization and Gradient Optimizationmentioning

confidence: 99%

Measurement of the permanent electric dipole moment of the Xe129 atom

et al. 2019

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“…A homogeneous vertical magnetic holding field of 600 pT corresponds to a spin precession angle of π/4 when the molecules pass through the interaction zone inside the passive magnetic shield similar to that employed in the 129 Xe EDM experiment [83]. A static field homogeneity of < 10 −3 can be reached with an additional coil system inside the µ-metal shield for higher magnetic multipole compensation.…”

Section: Interaction Zone and Measurementmentioning

confidence: 99%

Measuring the electric dipole moment of the electron in BaF

et al. 2018

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We investigate the merits of a measurement of the permanent electric dipole moment of the electron (eEDM) with barium monofluoride molecules, thereby searching for phenomena of CP violation beyond those incorporated in the Standard Model of particle physics. Although the BaF molecule has a smaller enhancement factor in terms of the effective electric field than other molecules used in current studies (YbF, ThO and ThF + ), we show that a competitive measurement is possible by combining Starkdeceleration, laser-cooling and an intense primary cold source of BaF molecules. With the long coherent interaction times obtainable in a cold beam of BaF, a sensitivity of 5 × 10 −30 e·cm for an eEDM is feasible. We describe the rationale, the challenges and the experimental methods envisioned to achieve this target.

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“…In order to reach long transverse relaxation times, it is necessary to further minimize the magnetic field gradients actively. In the past we already used free induction decay time T * 2 measurements to determine small magnetic field gradients [15]. Here we employ T * 2 measurements as the control element in a feedback loop.…”

Section: Xementioning

confidence: 99%

A new limit of the ¹²⁹Xenon Electric Dipole Moment

et al. 2019

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We report on the first preliminary result of our 129 Xe EDM measurement performed by the MIXed collaboration. The aim of this report is to demonstrate the feasibility of a new method to set limits on nuclear EDMs by investigating the EDM of the diamagnetic 129 Xe atoms. In our setup, hyperpolarized 3 He serves as a comagnetometer needed to suppress magnetic field fluctuations. The free induction decay of the two polarized spin species is directly measured by low noise DC SQUIDs, and the weighted phase difference extracted from these measurements is used to determine a preliminary upper limit on the 129 Xe EDM.

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Precise measurement of magnetic field gradients from free spin precession signals of 3He and 129Xe magnetometers

Cited by 15 publications

References 26 publications

Measurement of the permanent electric dipole moment of the Xe129 atom

Measurement of the permanent electric dipole moment of the Xe129 atom

Measuring the electric dipole moment of the electron in BaF

A new limit of the ¹²⁹Xenon Electric Dipole Moment

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Precise measurement of magnetic field gradients from free spin precession signals of 3He and 129Xe magnetometers

Cited by 15 publications

References 26 publications

Measurement of the permanent electric dipole moment of the Xe129 atom

Measurement of the permanent electric dipole moment of the Xe129 atom

Measuring the electric dipole moment of the electron in BaF

A new limit of the 129Xenon Electric Dipole Moment

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Product

Resources

About

A new limit of the ¹²⁹Xenon Electric Dipole Moment