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123 results on '"Afach, S."'

1. A Multi-Messenger Search for Exotic Field Emission with a Global Magnetometer Network

Author

Khamis, Sami S., Sulai, Ibrahim A., Hamilton, Paul, Afach, S., Buchler, B. C., Budker, D., Figueroa, N. L., Folman, R., Gavilán-Martín, D., Givon, M., Grujić, Z. D., Guo, H., Hedges, M. P., Kimball, D. F. Jackson, Kim, D., Klinger, E., Kornack, T., Kryemadhi, A., Kukowski, N., Lukasiewicz, G., Masia-Roig, H., Padniuk, M., Palm, C. A., Park, S. Y., Peng, X., Pospelov, M., Pustelny, S., Rosenzweig, Y., Ruimi, O. M., Segura, P. C., Scholtes, T., Semertzidis, Y. K., Shin, Y. C., Stalnaker, J. E., Tandon, D., Weis, A., Wickenbrock, A., Wilson, T., Wu, T., Zhang, J., and Zhao, Y.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment, Physics - Atomic Physics, Quantum Physics
Abstract

We present an analysis method to search for exotic low-mass field (ELF) bursts generated during large energy astrophysical events such as supernovae, binary black hole or binary neutron star mergers, and fast radio bursts using the Global Network of Optical Magnetometers for Exotic physics searches (GNOME). In our model, the associated gravitational waves or electromagnetic signals herald the arrival of the ELF burst that interacts via coupling to the spin of fermions in the magnetometers. This enables GNOME to serve as a tool for multi-messenger astronomy. The algorithm employs a model-agnostic excess-power method to identify network-wide candidate events to be subjected to a model-dependent generalized likelihood-ratio test to determine their statistical significance. We perform the first search with this technique on GNOME data coincident with the binary black hole merger S200311bg detected by LIGO/Virgo on the 11th of March 2020 and find no significant events. We place the first lab-based limits on combinations of ELF production and coupling parameters.

Published
2024

2. What can a GNOME do? Search targets for the Global Network of Optical Magnetometers for Exotic physics searches

Author

Afach, S., Tumturk, D. Aybas, Bekker, H., Buchler, B. C., Budker, D., Cervantes, K., Derevianko, A., Eby, J., Figueroa, N. L., Folman, R., Martin, D. Gavil'an, Givon, M., Grujic, Z. D., Guo, H., Hamilton, P., Hedges, M. P., Kimball, D. F. Jackson, Khamis, S., Kim, D., Klinger, E., Kryemadhi, A., Liu, X., Lukasiewicz, G., Masia-Roig, H., Padniuk, M., Palm, C. A., Park, S. Y., Pearson, H. R., Peng, X., Pospelov, M., Pustelny, S., Rosenzweig, Y., Ruimi, O. M., Scholtes, T., Segura, P. C., Semertzidis, Y. K., Shin, Y. C., Smiga, J. A., Stadnik, Y. V., Stalnaker, J. E., Sulai, I. A., Tandon, D., Vu, K., Weis, A., Wickenbrock, A., Wilson, T. Z., Wu, T., Xiao, W., Yang, Y., Yu, D., Yu, F., Zhang, J., and Zhao, Y.

Subjects
High Energy Physics - Phenomenology, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment, Physics - Atomic Physics, Quantum Physics
Abstract

Numerous observations suggest that there exist undiscovered beyond-the-Standard-Model particles and fields. Because of their unknown nature, these exotic particles and fields could interact with Standard Model particles in many different ways and assume a variety of possible configurations. Here we present an overview of the Global Network of Optical Magnetometers for Exotic physics searches (GNOME), our ongoing experimental program designed to test a wide range of exotic physics scenarios. The GNOME experiment utilizes a worldwide network of shielded atomic magnetometers (and, more recently, comagnetometers) to search for spatially and temporally correlated signals due to torques on atomic spins from exotic fields of astrophysical origin. We survey the temporal characteristics of a variety of possible signals currently under investigation such as those from topological defect dark matter (axion-like particle domain walls), axion-like particle stars, solitons of complex-valued scalar fields (Q-balls), stochastic fluctuations of bosonic dark matter fields, a solar axion-like particle halo, and bursts of ultralight bosonic fields produced by cataclysmic astrophysical events such as binary black hole mergers., Comment: 22 pages, 12 figures, submitted to Annalen der Physik

Published
2023
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3. Measurement of the permanent electric dipole moment of the neutron

Author

Abel, C., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Bondar, V., Burghoff, M., Chanel, E., Chowdhuri, Z., Chiu, P. -J., Clement, B., Crawford, C. B., Daum, M., Emmenegger, S., Ferraris-Bouchez, L., Fertl, M., Flaux, P., Franke, B., Fratangelo, A., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hayen, L., Heil, W., Henneck, R., Hélaine, V., Hild, N., Hodge, Z., Horras, M., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Knecht, A., Knowles, P., Koch, H. -C., Koss, P. A., Komposch, S., Kozela, A., Kraft, A., Krempel, J., Kuźniak, M., Lauss, B., Lefort, T., Lemière, Y., Leredde, A., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pierre, E., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quéméner, G., Rawlik, M., Rebreyend, D., Rienäcker, I., Ries, D., Roccia, S., Rogel, G., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Dinani, R. Tavakoli, Thorne, J. A., Virot, R., Voigt, J., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zenner, J., and Zsigmond, G.

Subjects
High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

We present the result of an experiment to measure the electric dipole moment (EDM) of the neutron at the Paul Scherrer Institute using Ramsey's method of separated oscillating magnetic fields with ultracold neutrons (UCN). Our measurement stands in the long history of EDM experiments probing physics violating time reversal invariance. The salient features of this experiment were the use of a Hg-199 co-magnetometer and an array of optically pumped cesium vapor magnetometers to cancel and correct for magnetic field changes. The statistical analysis was performed on blinded datasets by two separate groups while the estimation of systematic effects profited from an unprecedented knowledge of the magnetic field. The measured value of the neutron EDM is $d_{\rm n} = (0.0\pm1.1_{\rm stat}\pm0.2_{\rm sys})\times10^{-26}e\,{\rm cm}$., Comment: 5 pages, 4 figures, submitted to PRL on 18.12.2019

Published
2020
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4. Optically Pumped Cs Magnetometers Enabling a High-Sensitivity Search for the Neutron Electric Dipole Moment

Author

Abel, C., Afach, S., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Chiu, P. -J., Crawford, C. B., Chowdhuri, Z., Daum, M., Emmenegger, S., Ferraris-Bouchez, L., Fertl, M., Franke, B., Griffith, W. C., Grujić, Z. D., Hayen, L., Hélaine, V., Hild, N., Kasprzak, M., Kermaidic, Y., Kirch, K., Knowles, P., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Leredde, A., Mtchedlishvili, A., Mohanmurthy, P., Musgrave, M., Naviliat-Cuncic, O., Pais, D., Pazgalev, A., Piegsa, F. M., Pierre, E., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Dinani, R. Tavakoli, Thorne, J., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.

Subjects
Physics - Atomic Physics, High Energy Physics - Experiment, Nuclear Experiment
Abstract

An array of sixteen laser-pumped scalar Cs magnetometers was part of the neutron electric dipole moment (nEDM) experiment taking data at the Paul Scherrer Institute in 2015 and 2016. It was deployed to measure the gradients of the experiment's magnetic field and to monitor their temporal evolution. The originality of the array lies in its compact design, in which a single near-infrared diode laser drives all magnetometers that are located in a high-vacuum chamber, with a selection of the sensors mounted on a high-voltage electrode. We describe details of the Cs sensors' construction and modes of operation, emphasizing the accuracy and sensitivity of the magnetic field readout. We present two applications of the magnetometer array directly beneficial to the nEDM experiment: (i) the implementation of a strategy to correct for the drift of the vertical magnetic field gradient and (ii) a procedure to homogenize the magnetic field. The first reduces the uncertainty of the new nEDM result. The second enables transverse neutron spin relaxation times exceeding 1500 s, improving the statistical sensitivity of the nEDM experiment by about 35% and effectively increasing the rate of nEDM data taking by a factor of 1.8.

Published
2019
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5. Characterization of the Global Network of Optical Magnetometers to search for Exotic Physics (GNOME)

Author

Afach, S., Budker, D., DeCamp, G., Dumont, V., Grujić, Z. D., Guo, H., Kimball, D. F. Jackson, Kornack, T. W., Lebedev, V., Li, W., Masia-Roig, H., Nix, S., Padniuk, M., Palm, C. A., Pankow, C., Penaflor, A., Peng, X., Pustelny, S., Scholtes, T., Smiga, J. A., Stalnaker, J. E., Weis, A., Wickenbrock, A., and Wurm, D.

Subjects
Physics - Instrumentation and Detectors, Physics - Atomic Physics, Quantum Physics
Abstract

The Global Network of Optical Magnetometers to search for Exotic physics (GNOME) is a network of geographically separated, time-synchronized, optically pumped atomic magnetometers that is being used to search for correlated transient signals heralding exotic physics. The GNOME is sensitive to nuclear- and electron-spin couplings to exotic fields from astrophysical sources such as compact dark-matter objects (for example, axion stars and domain walls). Properties of the GNOME sensors such as sensitivity, bandwidth, and noise characteristics are studied in the present work, and features of the network's operation (e.g., data acquisition, format, storage, and diagnostics) are described. Characterization of the GNOME is a key prerequisite to searches for and identification of exotic physics signatures., Comment: 45 pages, 16 figures, 2 tables

Published
2018
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6. Overview of the Cosmic Axion Spin Precession Experiment (CASPEr)

Author

Kimball, D. F. Jackson, Afach, S., Aybas, D., Blanchard, J. W., Budker, D., Centers, G., Engler, M., Figueroa, N. L., Garcon, A., Graham, P. W., Luo, H., Rajendran, S., Sendra, M. G., Sushkov, A. O., Wang, T., Wickenbrock, A., Wilzewski, A., and Wu, T.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

An overview of our experimental program to search for axion and axion-like-particle (ALP) dark matter using nuclear magnetic resonance (NMR) techniques is presented. An oscillating axion field can exert a time-varying torque on nuclear spins either directly or via generation of an oscillating nuclear electric dipole moment (EDM). Magnetic resonance techniques can be used to detect such an effect. The first-stage experiments explore many decades of ALP parameter space beyond the current astrophysical and laboratory bounds. It is anticipated that future versions of the experiments will be sensitive to the axions associated with quantum chromodynamics (QCD) having masses $\lesssim 10^{-9}~{\rm eV}/c^2$., Comment: 9 pages, 4 figures

Published
2017

7. Overview of the Cosmic Axion Spin Precession Experiment (CASPEr)

Author

Jackson Kimball, Derek F., Afach, S., Aybas, D., Blanchard, J. W., Budker, D., Centers, G., Engler, M., Figueroa, N. L., Garcon, A., Graham, P. W., Luo, H., Rajendran, S., Sendra, M. G., Sushkov, A. O., Wang, T., Wickenbrock, A., Wilzewski, A., Wu, T., Carosi, Gianpaolo, editor, and Rybka, Gray, editor

Published
2020
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8. A Revised Experimental Upper Limit on the Electric Dipole Moment of the Neutron

Author

Pendlebury, J. M., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Burghoff, M., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujic, Z. D., Harris, P. G., Helaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., May, D. J. R., Musgrave, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quemener, G., Rawlik, M., Rebreyend, D., Richardson, J. D., Ries, D., Roccia, S., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, A., Winston, O. J., Wursten, E., Zejma, J., and Zsigmond, G.

Subjects
High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

We present for the first time a detailed and comprehensive analysis of the experimental results that set the current world sensitivity limit on the magnitude of the electric dipole moment (EDM) of the neutron. We have extended and enhanced our earlier analysis to include recent developments in the understanding of the effects of gravity in depolarizing ultracold neutrons (UCN); an improved calculation of the spectrum of the neutrons; and conservative estimates of other possible systematic errors, which are also shown to be consistent with more recent measurements undertaken with the apparatus. We obtain a net result of $d_\mathrm{n} = -0.21 \pm 1.82 \times10^{-26}$ $e$cm, which may be interpreted as a slightly revised upper limit on the magnitude of the EDM of $3.0 \times10^{-26}$ $e$cm (90% CL) or $ 3.6 \times10^{-26}$ $e$cm (95% CL). This paper is dedicated by the remaining authors to the memory of Prof. J. Michael Pendlebury., Comment: 23 pages, 19 figures. Authorship list changed to put J.M. Pendlebury first. Other very minor edits

Published
2015
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9. A highly stable atomic vector magnetometer based on free spin precession

Author

Afach, S., Ban, G., Bison, G., Bodek, K., Chowdhuri, Z., Grujic, Z. D., Hayen, L., Helaine, V., Kasprzak, M., Kirch, K., Knowles, P., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Piegsa, F. M., Prashanth, P. N., Quemener, G., Rawlik, M., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severjins, N., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.

Subjects
Physics - Atomic Physics
Abstract

We present a magnetometer based on optically pumped Cs atoms that measures the magnitude and direction of a 1 $\mu$T magnetic field. Multiple circularly polarized laser beams were used to probe the free spin precession of the Cs atoms. The design was optimized for long-time stability and achieves a scalar resolution better than 300 fT for integration times ranging from 80 ms to 1000 s. The best scalar resolution of less than 80 fT was reached with integration times of 1.6 to 6 s. We were able to measure the magnetic field direction with a resolution better than 10 $\mu$rad for integration times from 10 s up to 2000 s.

Published
2015
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10. Gravitational Depolarization of Ultracold Neutrons: Comparison with Data

Author

Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Fertl, M., Franke, B., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujic, Z. D., Harris, P. G., Heil, W., Helaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Musgrave, M., Naviliat-Cunic, O., Pendlebury, J. M., Piegsa, F. M., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quemener, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, A., Wursten, E., Zejma, J., Zenner, J., and Zsigmond, G.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

We compare the expected effects of so-called gravitationally enhanced depolarization of ultracold neutrons to measurements carried out in a spin-precession chamber exposed to a variety of vertical magnetic-field gradients. In particular, we have investigated the dependence upon these field gradients of spin depolarization rates and also of shifts in the measured neutron Larmor precession frequency. We find excellent qualitative agreement, with gravitationally enhanced depolarization accounting for several previously unexplained features in the data., Comment: 10 pages, 6 figures. Updated: section added about implications for current nEDM limit

Published
2015
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11. Observation of gravitationally induced vertical striation of polarized ultracold neutrons by spin-echo spectroscopy

Author

Afach, S., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Griffith, W. C., Grujić, Z. D., Harris, P. G., Heil, W., Hélaine, V., Kasprzak, M., Kermaidic, Y., Kirch, K., Knowles, P., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Musgrave, M., Naviliat-Cuncic, O., Pendlebury, J. M., Piegsa, F. M., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Thorne, J. A., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zenner, J., and Zsigmond, G.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

We describe a spin-echo method for ultracold neutrons (UCNs) confined in a precession chamber and exposed to a $|B_0|=1~\text{\mu T}$ magnetic field. We have demonstrated that the analysis of UCN spin-echo resonance signals in combination with knowledge of the ambient magnetic field provides an excellent method by which to reconstruct the energy spectrum of a confined ensemble of neutrons. The method takes advantage of the relative dephasing of spins arising from a gravitationally induced striation of stored UCN of different energies, and also permits an improved determination of the vertical magnetic-field gradient with an exceptional accuracy of $1.1~\text{pT/cm}$. This novel combination of a well-known nuclear resonance method and gravitationally induced vertical striation is unique in the realm of nuclear and particle physics and should prove to be invaluable for the assessment of systematic effects in precision experiments such as searches for an electric dipole moment of the neutron or the measurement of the neutron lifetime., Comment: 7 pages 5 figures, accepted by PRL, September, 08 2015

Published
2015
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12. Measurement of a false electric dipole moment signal from $^{199}$Hg atoms exposed to an inhomogeneous magnetic field

Author

Afach, S., Baker, C. A., Ban, G., Bison, G., Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Green, K., van der Grinten, M. G. D., Grujic, Z., Harris, P. G., Heil, W., Hélaine, V., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaïdic, Y., Kirch, K., Knowles, P., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Pendlebury, J. M., Piegsa, F. M., Pignol, G., Prashant, P. N., Quéméner, G., Rebreyend, D., Ries, D., Roccia, S., Schmidt-Wellenburg, P., Severijns, N., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zenner, J., and Zsigmond, G.

Subjects
Physics - Atomic Physics, Nuclear Experiment
Abstract

We report on the measurement of a Larmor frequency shift proportional to the electric-field strength for $^{199}{\rm Hg}$ atoms contained in a volume permeated with aligned magnetic and electric fields. This shift arises from the interplay between the inevitable magnetic field gradients and the motional magnetic field. The proportionality to electric-field strength makes it apparently similar to an electric dipole moment (EDM) signal, although unlike an EDM this effect is P- and T-conserving. We have used a neutron magnetic resonance EDM spectrometer, featuring a mercury co-magnetometer and an array of external cesium magnetometers, to measure the shift as a function of the applied magnetic field gradient. Our results are in good agreement with theoretical expectations.

Published
2015
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13. A device for simultaneous spin analysis of ultracold neutrons

Author

Afach, S., Ban, G., Bison, G., Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Grujić, Z. D., Hayen, L., Hélaine, V., Henneck, R., Kasprzak, M., Kermaidic, Y., Kirch, K., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

We report on the design and first tests of a device allowing for measurement of ultracold neutrons polarisation by means of the simultaneous analysis of the two spin components. The device was developed in the framework of the neutron electric dipole moment experiment at the Paul Scherrer Institute. Individual parts and the entire newly built system have been characterised with ultracold neutrons. The gain in statistical sensitivity obtained with the simultaneous spin analyser is $(18.2\pm6.1)\%$ relative to the former sequential analyser under nominal running conditions.

Published
2015

14. Constraining interactions mediated by axion-like particles with ultracold neutrons

Author

Afach, S., Ban, G., Bison, G., Bodek, K., Burghoff, M., Daum, M., Fertl, M., Franke, B., Grujić, Z. D., Hélaine, V., Kasprzak, M., Kermaïdic, Y., Kirch, K., Knowles, P., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rebreyend, D., Ries, D., Roccia, S., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Voigt, J., Weis, A., Zejma, G. Wyszynski J., Zenner, J., and Zsigmond, G.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

We report a new limit on a possible short range spin-dependent interaction from the precise measurement of the ratio of Larmor precession frequencies of stored ultracold neutrons and $^{199}$Hg atoms confined in the same volume. The measurement was performed in a $\sim$1$\mu$ T vertical magnetic holding field with the apparatus searching for a permanent electric dipole moment of the neutron at the Paul Scherrer Institute. A possible coupling between freely precessing polarized neutron spins and unpolarized nucleons of the wall material can be investigated by searching for a tiny change of the precession frequencies of neutron and mercury spins. Such a frequency change can be interpreted as a consequence of a short range spin-dependent interaction that could possibly be mediated by axions or axion-like particles. The interaction strength is proportional to the CP violating product of scalar and pseudoscalar coupling constants $g_Sg_P$. Our result confirms limits from complementary experiments with spin-polarized nuclei in a model-independent way. Limits from other neutron experiments are improved by up to two orders of magnitude in the interaction range of $10^{-6}<\lambda<10^{-4}$ m.

Published
2014
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15. Microwave-free magnetometry with nitrogen-vacancy centers in diamond

Author

Wickenbrock, A, Zheng, H, Bougas, L, Leefer, N, Afach, S, Jarmola, A, Acosta, VM, and Budker, D

Subjects
cond-mat.mes-hall, physics.ins-det, physics.optics, Applied Physics, Engineering, Physical Sciences, Technology
Abstract

We use magnetic-field-dependent features in the photoluminescence of negatively charged nitrogen-vacancy centers to measure magnetic fields without the use of microwaves. In particular, we present a magnetometer based on the level anti-crossing in the triplet ground state at 102.4 mT with a demonstrated noise floor of 6 nT/ Hz, limited by the intensity noise of the laser and the performance of the background-field power supply. The technique presented here can be useful in applications where the sensor is placed close to conductive materials, e.g., magnetic induction tomography or magnetic field mapping, and in remote-sensing applications since principally no electrical access is needed.

Published
2016

16. A measurement of the neutron to 199Hg magnetic moment ratio

Author

Afach, S., Baker, C. A., Ban, G., Bison, G., Bodek, K., Burghoff, M., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Green, K., van der Grinten, M. G. D., Grujic, Z., Harris, P. G., Heil, W., Hélaine, V., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaïdic, Y., Kirch, K., Knecht, A., Koch, H. -C., Krempel, J., Kuźniak, M., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Pendlebury, J. M., Perkowski, M., Pierre, E., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rebreyend, D., Ries, D., Roccia, S., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Shiers, D., Smith, K. F., Voigt, J., Weis, A., Wyszynski, G., Zejma, J., Zenner, J., and Zsigmond, G.

Subjects
Nuclear Experiment, Physics - Atomic Physics, Physics - Instrumentation and Detectors
Abstract

The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty of 0.8 ppm. We employed an apparatus where ultracold neutrons and mercury atoms are stored in the same volume and report the result $\gamma_{\rm n}/\gamma_{\rm Hg} = 3.8424574(30)$.

Published
2014
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17. Dynamic stabilization of the magnetic field surrounding the neutron electric dipole moment spectrometer at the Paul Scherrer Institute

Author

Afach, S., Bison, G., Bodek, K., Burri, F., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Grujic, Z., Helaine, V., Henneck, R., Kasprzak, M., Kirch, K., Koch, H. -C., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Meier, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quemener, G., Rebreyend, D., Roccia, S., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Voigt, J., Weis, A., Wyszynski, G., Zejma, J., Zenner, J., and Zsigmond, G.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment, Physics - Atomic Physics
Abstract

The Surrounding Field Compensation (SFC) system described in this work is installed around the four-layer Mu-metal magnetic shield of the neutron electric dipole moment spectrometer located at the Paul Scherrer Institute. The SFC system reduces the DC component of the external magnetic field by a factor of about 20. Within a control volume of approximately 2.5m x 2.5m x 3m disturbances of the magnetic field are attenuated by factors of 5 to 50 at a bandwidth from $10^{-3}$ Hz up to 0.5 Hz, which corresponds to integration times longer than several hundreds of seconds and represent the important timescale for the nEDM measurement. These shielding factors apply to random environmental noise from arbitrary sources. This is achieved via a proportional-integral feedback stabilization system that includes a regularized pseudoinverse matrix of proportionality factors which correlates magnetic field changes at all sensor positions to current changes in the SFC coils., Comment: 33 pages, 18 figures

Published
2014
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18. An Improved Search for the Neutron Electric Dipole Moment

Author

Burghoff, M., Schnabel, A., Ban, G., Lefort, T., Lemiere, Y., Naviliat-Cuncic, O., Pierre, E., Quemener, G., Zejma, J., Kasprzak, M., Knowles, P., Weis, A., Pignol, G., Rebreyend, D., Afach, S., Bison, G., Becker, J., Severijns, N., Roccia, S., Plonka-Spehr, C., Zennerz, J., Heil, W., Koch, H. C., Kraft, A., Lauer, T., Sobolev, Yu., Chowdhuri, Z., Krempel, J., Lauss, B., Mtchedlishvili, A., Schmidt-Wellenburg, P., Zsigmond, G., Fertl, M., Franke, B., Horras, M., Kirch, K., and Piegsa, F.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

A permanent electric dipole moment of fundamental spin-1/2 particles violates both parity (P) and time re- versal (T) symmetry, and hence, also charge-parity (CP) symmetry since there is no sign of CPT-violation. The search for a neutron electric dipole moment (nEDM) probes CP violation within and beyond the Stan- dard Model. The experiment, set up at the Paul Scherrer Institute (PSI), an improved, upgraded version of the apparatus which provided the current best experimental limit, dn < 2.9E-26 ecm (90% C.L.), by the RAL/Sussex/ILL collaboration: Baker et al., Phys. Rev. Lett. 97, 131801 (2006). In the next two years we aim to improve the sensitivity of the apparatus to sigma(dn) = 2.6E-27 ecm corresponding to an upper limit of dn < 5E-27 ecm (95% C.L.), in case for a null result. In parallel the collaboration works on the design of a new apparatus to further increase the sensitivity to sigma(dn) = 2.6E-28 ecm., Comment: APS Division for particles and fields, Conference Proceedings, Two figures

Published
2011

19. Overview of the Cosmic Axion Spin Precession Experiment (CASPEr)

Author

Jackson Kimball, Derek F., primary, Afach, S., additional, Aybas, D., additional, Blanchard, J. W., additional, Budker, D., additional, Centers, G., additional, Engler, M., additional, Figueroa, N. L., additional, Garcon, A., additional, Graham, P. W., additional, Luo, H., additional, Rajendran, S., additional, Sendra, M. G., additional, Sushkov, A. O., additional, Wang, T., additional, Wickenbrock, A., additional, Wilzewski, A., additional, and Wu, T., additional

Published
2020
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23. A device for simultaneous spin analysis of ultracold neutrons

Author

Afach, S., Ban, G., Bison, G., Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Grujić, Z., Hayen, L., Hélaine, V., Henneck, R., Kasprzak, M., Kermaïdic, Y., Kirch, K., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Piegsa, F., Pignol, G., Prashanth, P., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zsigmond, G., Afach, S., Ban, G., Bison, G., Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Grujić, Z., Hayen, L., Hélaine, V., Henneck, R., Kasprzak, M., Kermaïdic, Y., Kirch, K., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Piegsa, F., Pignol, G., Prashanth, P., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.

Abstract

We report on the design and first tests of a device allowing for measurement of ultracold neutrons polarisation by means of the simultaneous analysis of the two spin components. The device was developed in the framework of the neutron electric dipole moment experiment at the Paul Scherrer Institute. Individual parts and the entire newly built system have been characterised with ultracold neutrons. The gain in statistical sensitivity obtained with the simultaneous spin analyser is $(18.2\pm 6.1)$ % relative to the former sequential analyser under nominal running conditions.

Published
2021

27. Optically pumped Cs magnetometers enabling a high-sensitivity search for the neutron electric dipole moment

Author

Abel, C., primary, Afach, S., additional, Ayres, N. J., additional, Ban, G., additional, Bison, G., additional, Bodek, K., additional, Bondar, V., additional, Chanel, E., additional, Chiu, P.-J., additional, Crawford, C. B., additional, Chowdhuri, Z., additional, Daum, M., additional, Emmenegger, S., additional, Ferraris-Bouchez, L., additional, Fertl, M., additional, Franke, B., additional, Griffith, W. C., additional, Grujić, Z. D., additional, Hayen, L., additional, Hélaine, V., additional, Hild, N., additional, Kasprzak, M., additional, Kermaidic, Y., additional, Kirch, K., additional, Knowles, P., additional, Koch, H.-C., additional, Komposch, S., additional, Koss, P. A., additional, Kozela, A., additional, Krempel, J., additional, Lauss, B., additional, Lefort, T., additional, Lemière, Y., additional, Leredde, A., additional, Mtchedlishvili, A., additional, Mohanmurthy, P., additional, Musgrave, M., additional, Naviliat-Cuncic, O., additional, Pais, D., additional, Pazgalev, A., additional, Piegsa, F. M., additional, Pierre, E., additional, Pignol, G., additional, Prashanth, P. N., additional, Quéméner, G., additional, Rawlik, M., additional, Rebreyend, D., additional, Ries, D., additional, Roccia, S., additional, Rozpedzik, D., additional, Schmidt-Wellenburg, P., additional, Schnabel, A., additional, Severijns, N., additional, Dinani, R. Tavakoli, additional, Thorne, J., additional, Weis, A., additional, Wursten, E., additional, Wyszynski, G., additional, Zejma, J., additional, and Zsigmond, G., additional

Published
2020
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28. Measurement of the Permanent Electric Dipole Moment of the Neutron

Author

Abel, C., primary, Afach, S., additional, Ayres, N. J., additional, Baker, C. A., additional, Ban, G., additional, Bison, G., additional, Bodek, K., additional, Bondar, V., additional, Burghoff, M., additional, Chanel, E., additional, Chowdhuri, Z., additional, Chiu, P.-J., additional, Clement, B., additional, Crawford, C. B., additional, Daum, M., additional, Emmenegger, S., additional, Ferraris-Bouchez, L., additional, Fertl, M., additional, Flaux, P., additional, Franke, B., additional, Fratangelo, A., additional, Geltenbort, P., additional, Green, K., additional, Griffith, W. C., additional, van der Grinten, M., additional, Grujić, Z. D., additional, Harris, P. G., additional, Hayen, L., additional, Heil, W., additional, Henneck, R., additional, Hélaine, V., additional, Hild, N., additional, Hodge, Z., additional, Horras, M., additional, Iaydjiev, P., additional, Ivanov, S. N., additional, Kasprzak, M., additional, Kermaidic, Y., additional, Kirch, K., additional, Knecht, A., additional, Knowles, P., additional, Koch, H.-C., additional, Koss, P. A., additional, Komposch, S., additional, Kozela, A., additional, Kraft, A., additional, Krempel, J., additional, Kuźniak, M., additional, Lauss, B., additional, Lefort, T., additional, Lemière, Y., additional, Leredde, A., additional, Mohanmurthy, P., additional, Mtchedlishvili, A., additional, Musgrave, M., additional, Naviliat-Cuncic, O., additional, Pais, D., additional, Piegsa, F. M., additional, Pierre, E., additional, Pignol, G., additional, Plonka-Spehr, C., additional, Prashanth, P. N., additional, Quéméner, G., additional, Rawlik, M., additional, Rebreyend, D., additional, Rienäcker, I., additional, Ries, D., additional, Roccia, S., additional, Rogel, G., additional, Rozpedzik, D., additional, Schnabel, A., additional, Schmidt-Wellenburg, P., additional, Severijns, N., additional, Shiers, D., additional, Tavakoli Dinani, R., additional, Thorne, J. A., additional, Virot, R., additional, Voigt, J., additional, Weis, A., additional, Wursten, E., additional, Wyszynski, G., additional, Zejma, J., additional, Zenner, J., additional, and Zsigmond, G., additional

Published
2020
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31. Characterization of the global network of optical magnetometers to search for exotic physics (GNOME)

Author

Afach, S., Budker, D., Camp, G. De, Dumont, V., Grujić, Zoran Dragan, Guo, H., Jackson Kimball, D. F., Kornack, T. W., Lebedev, Victor, Li, W., Masia-Roig, H., Nix, S., Padniuk, M., Palm, C. A., Pankow, C., Penaflor, A., Peng, X., Pustelny, Simon, Scholtes, Theo, Smiga, J. A., Stalnaker, J. E., Weis, Antoine, Wickenbrock, A., Wurm, D., Afach, S., Budker, D., Camp, G. De, Dumont, V., Grujić, Zoran Dragan, Guo, H., Jackson Kimball, D. F., Kornack, T. W., Lebedev, Victor, Li, W., Masia-Roig, H., Nix, S., Padniuk, M., Palm, C. A., Pankow, C., Penaflor, A., Peng, X., Pustelny, Simon, Scholtes, Theo, Smiga, J. A., Stalnaker, J. E., Weis, Antoine, Wickenbrock, A., and Wurm, D.

Abstract

The Global Network of Optical Magnetometers to search for Exotic physics (GNOME) is a network of geographically separated, time-synchronized, optically pumped atomic magnetometers that is being used to search for correlated transient signals heralding exotic physics. The GNOME is sensitive to nuclear- and electron-spin couplings to exotic fields from astrophysical sources such as compact dark-matter objects (for example, axion stars and domain walls). Properties of the GNOME sensors such as sensitivity, bandwidth, and noise characteristics are studied in the present work, and features of the network’s operation (e.g., data acquisition, format, storage, and diagnostics) are described. Characterization of the GNOME is a key prerequisite to searches for and identification of exotic physics signatures.

Published
2019

32. Characterization of the global network of optical magnetometers to search for exotic physics (GNOME)

Author

Afach, S., primary, Budker, D., additional, DeCamp, G., additional, Dumont, V., additional, Grujić, Z.D., additional, Guo, H., additional, Jackson Kimball, D.F., additional, Kornack, T.W., additional, Lebedev, V., additional, Li, W., additional, Masia-Roig, H., additional, Nix, S., additional, Padniuk, M., additional, Palm, C.A., additional, Pankow, C., additional, Penaflor, A., additional, Peng, X., additional, Pustelny, S., additional, Scholtes, T., additional, Smiga, J.A., additional, Stalnaker, J.E., additional, Weis, A., additional, Wickenbrock, A., additional, and Wurm, D., additional

Published
2018
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33. Constraining interactions mediated by axion-like particles with ultracold neutrons

Author

Afach S., Ban G., Bison G., Bodek K., Burghoff M., Daum M., Fertl M., Franke B., Grujic Z.D., Hélaine V., Kasprzak M., Kermaïdic Y., Kirch K., Knowles P., Koch H.-C., Komposch S., Kozela A., Krempel J., Lauss B., Lefort T., Lemière Y., Mtchedlishvili A., Naviliat-Cuncic O., Piegsa F.M., and Pignol G.

Abstract

We report a new limit on a possible short range spin dependent interaction from the precise measurement of the ratio of Larmor precession frequencies of stored ultracold neutrons and Hg 199 atoms confined in the same volume. The measurement was performed in a ~ 1 µT vertical magnetic holding field with the apparatus searching for a permanent electric dipole moment of the neutron at the Paul Scherrer Institute. A possible coupling between freely precessing polarized neutron spins and unpolarized nucleons of the wall material can be investigated by searching for a tiny change of the precession frequencies of neutron and mercury spins. Such a frequency change can be interpreted as a consequence of a short range spin dependent interaction that could possibly be mediated by axions or axion like particles. The interaction strength is proportional to the \{CP\} violating product of scalar and pseudoscalar coupling constants g S g P . Our result confirms limits from complementary experiments with spin polarized nuclei in a model independent way. Limits from other neutron experiments are improved by up to two orders of magnitude in the interaction range of 10 - 6 lt; ? lt; 10 - 4 m .

Published
2015

34. Meta‐analysis results do not reflect the real safety of biologics in psoriasis*.

Author

Afach, S., Chaimani, A., Evrenoglou, T., Penso, L., Brouste, E., Sbidian, E., and Le Cleach, L.

Subjects
*CLINICAL trial registries, *RANDOMIZED controlled trials, *REPORTING of diseases, *BIOLOGICALS
Abstract

Summary: Background: In reported systematic reviews and meta‐analyses of randomized controlled trials (RCTs) assessing treatments for psoriasis, the proportion of serious adverse events (SAEs) did not differ between treatments and placebo. Including cases of psoriasis worsening as SAEs may explain the lack of difference. Objectives: This systematic review and meta‐analysis aimed to explore this possibility. Methods: Among the 140 RCTs included in the Living Network Cochrane Review (last search on 8 May 2019), we selected those comparing a biologic treatment against placebo. The primary outcome was the numbers of SAEs in the treatment and placebo arms after excluding cases of psoriasis worsening. Secondary outcomes were the number of adverse events (AEs) of special interest. The trial was registered on PROSPERO (CRD42019124495). Results: We analysed 51 RCTs. Of these, 21 included at least one anti‐tumour necrosis factor (TNF)‐α arm, 15 one anti‐interleukin (IL)‐17 arm, 11 one anti‐IL‐23 arm and nine one anti‐IL‐12/23 arm. With cases of psoriasis worsening included, the risk of occurrence of SAEs between biologic treatments and placebo did not differ: risk ratio (RR) 1·09, 95% confidence interval (CI) 0·88–1·36. After excluding cases of psoriasis worsening, the RR became significant (RR 1·30, 95% CI 1·02–1·65). By drug class, the RRs were for anti‐TNF‐α, 1·68 (95% CI 1·11–2·54; no missing data); anti‐IL‐17, 1·28 (95% CI 0·88–1·85; no missing data); anti‐IL‐23, 0·95 (95% CI 0·59–1·52; no missing data) and anti‐IL‐12/23, 1·18 (95% CI 0·72–1·94; no missing data). We were unable to examine potential differences in AEs of special interest between biologic treatments and placebo arms because of the small number of events. Conclusions: On excluding cases of worsening psoriasis, the risk of occurrence of SAEs is higher in the biologic than in the placebo arm. Given the rare events, we could not highlight whether this higher risk of SAEs was related to AEs of special interest. Reporting of SAEs in clinical trials has to be changed to provide more transparency through the separate reporting of disease flares leading to hospital admission and other SAEs. What is already known about this topic? Systematic reviews and meta‐analyses assessing the safety of biologic treatments for plaque‐type psoriasis in randomized controlled trials concluded that the proportion of serious adverse events (SAEs) was not significantly different between biologic and placebo groups. What does this study add?On excluding cases of worsening psoriasis, the risk of occurrence of SAEs is higher in the biologic group than in the placebo group, especially for anti‐tumour necrosis factor‐α treatments.Given the rare events, we could not highlight whether this higher risk of SAEs was related to adverse events of special interest. Linked Comment: Dávila?Seijo. Br J Dermatol 2021; 184:385. Plain language summary available online [ABSTRACT FROM AUTHOR]

Published
2021
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36. A Revised Experimental Upper Limit on the Electric Dipole Moment of the Neutron

Author

Pendlebury, J M, Afach, S, Ayres, N J, Baker, C A, Ban, G, Bison, G, Bodek, K, Burghoff, M, Geltenbort, P, Green, K, Griffith, W C, van der Grinten, M, Grujic, Z D, Harris, P G, Helaine, V, Iaydjiev, P, Ivanov, S N, Kasprzak, M, Kermaidic, Y, Kirch, K, Koch, H-C, Komposch, S, Kozela, A, Krempel, J, Lauss, B, Lefort, T, Lemiere, Y, May, D J R, Musgrave, M, Naviliat-Cuncic, O, Piegsa, F M, Pignol, G, Prashanth, P N, Quéméner, G, Rawlik, M, Rebreyend, D, Richardson, J D, Ries, D, Roccia, S, Rozpedzik, D, Schnabel, A, Schmidt-Wellenburg, P, Severijns, N, Shiers, D, Thorne, J A, Weis, A, Winston, O J, Wursten, E, Zejma, J, Zsigmond, G, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, Magnitude (mathematics), 01 natural sciences, Resonance (particle physics), High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Quantum mechanics, Paul-Scherrer Institute, Cesium atom, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutron, Limit (mathematics), 010306 general physics, Physics, Conservation law, magnetic-moment, Magnetic moment, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), QC0793, Atomic-Mercury magnetometer, Electric dipole moment, resonance, Quantum electrodynamics, Ultracold neutrons, Particle Physics - Experiment
Abstract

We present for the first time a detailed and comprehensive analysis of the experimental results that set the current world sensitivity limit on the magnitude of the electric dipole moment (EDM) of the neutron. We have extended and enhanced our earlier analysis to include recent developments in the understanding of the effects of gravity in depolarizing ultracold neutrons (UCN); an improved calculation of the spectrum of the neutrons; and conservative estimates of other possible systematic errors, which are also shown to be consistent with more recent measurements undertaken with the apparatus. We obtain a net result of $d_\mathrm{n} = -0.21 \pm 1.82 \times10^{-26}$ $e$cm, which may be interpreted as a slightly revised upper limit on the magnitude of the EDM of $3.0 \times10^{-26}$ $e$cm (90% CL) or $ 3.6 \times10^{-26}$ $e$cm (95% CL). This paper is dedicated by the remaining authors to the memory of Prof. J. Michael Pendlebury., 23 pages, 19 figures. Authorship list changed to put J.M. Pendlebury first. Other very minor edits

Published
2015

37. A measurement of the neutron to 199Hg magnetic moment ratio

Author

Afach, S., Baker, C. A., Ban, G., Bison, Georg, Bodek, K., Burghoff, M., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Green, K., Grinten, M. G. D. van der, Grujic, Zoran, Harris, P. G., Heil, W., Hélaine, V., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S. N., Kasprzak, Malgorzata, Kermaïdic, Y., Kirch, K., Knecht, A., Koch, Hans-Christian, Krempel, J., Kuźniak, M., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Pendlebury, J. M., Perkowski, M., Pierre, E., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rebreyend, D., Ries, D., Roccia, S., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Shiers, D., Smith, K.F., Voigt, J., and Weis, Antoine

Abstract

The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty of 0.8 ppm. We employed an apparatus where ultracold neutrons and mercury atoms are stored in the same volume and report the result γn/γHg=3.8424574(30)γn/γHg=3.8424574(30).

Published
2015

38. Revised experimental upper limit on the electric dipole moment of the neutron

Author

Pendlebury, J. M., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, Georg, Bodek, K., Burghoff, M., Geltenbort, P., Green, K., Griffith, W. C., Grinten, M. van der, Grujić, Z. D., Harris, P. G., Hélaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., May, D. J. R., Musgrave, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Rebreyend, D., Richardson, J. D., Ries, D., Roccia, S., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, Antoine, Winston, O. J., Wursten, E., Zejma, J., Zsigmond, G., Pendlebury, J. M., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, Georg, Bodek, K., Burghoff, M., Geltenbort, P., Green, K., Griffith, W. C., Grinten, M. van der, Grujić, Z. D., Harris, P. G., Hélaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., May, D. J. R., Musgrave, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Rebreyend, D., Richardson, J. D., Ries, D., Roccia, S., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, Antoine, Winston, O. J., Wursten, E., Zejma, J., and Zsigmond, G.

Abstract

We present for the first time a detailed and comprehensive analysis of the experimental results that set the current world sensitivity limit on the magnitude of the electric dipole moment (EDM) of the neutron. We have extended and enhanced our earlier analysis to include recent developments in the understanding of the effects of gravity in depolarizing ultracold neutrons; an improved calculation of the spectrum of the neutrons; and conservative estimates of other possible systematic errors, which are also shown to be consistent with more recent measurements undertaken with the apparatus. We obtain a net result of dn=−0.21±1.82×10−26 e cm, which may be interpreted as a slightly revised upper limit on the magnitude of the EDM of 3.0×10−26 e cm (90% C.L.) or 3.6×10−26 e cm (95% C.L.).

Published
2016

39. A device for simultaneous spin analysis of ultracold neutrons

Author

Afach, S., Ban, G., Bison, Georg, Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Grujić, Zoran. D., Hayen, L., Hélaine, V., Henneck, R., Kasprzak, Malgorzata, Kermaïdic, Y., Kirch, K., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Cuncic, O. Naviliat, Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Wellenburg, P. Schmidt, Severijns, N., Weis, Antoine, Wursten, E., Wyszynski, G., Zejma, J., Zsigmond, G., Afach, S., Ban, G., Bison, Georg, Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Grujić, Zoran. D., Hayen, L., Hélaine, V., Henneck, R., Kasprzak, Malgorzata, Kermaïdic, Y., Kirch, K., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Cuncic, O. Naviliat, Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Wellenburg, P. Schmidt, Severijns, N., Weis, Antoine, Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.

Abstract

We report on the design and first tests of a device allowing for measurement of ultracold neutrons polarisation by means of the simultaneous analysis of the two spin components. The device was developed in the framework of the neutron electric dipole moment experiment at the Paul Scherrer Institute. Individual parts and the entire newly built system have been characterised with ultracold neutrons. The gain in statistical sensitivity obtained with the simultaneous spin analyser is (18.2±6.1)% relative to the former sequential analyser under nominal running conditions.

Published
2016

40. Constraining interactions mediated by axion-like particles with ultracold neutrons

Author

Afach, S., Ban, Gert, Bison, Georg, Bodek, K., Burghoff, M., Daum, M., Fertl, M., Franke, B., Grujić, Z.D., Hélaine, V., Kasprzak, Malgorzata, Kermaïdic, Y., Kirch, K., Knowles, Paul E., Koch, H.-C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, , T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Piegsa, F.M., Pignol, G., Prashanth, P.N., Quéméner, G., Rebreyend, D., Ries, D., Roccia, S., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Voigt, J., Weis, Antoine, Wyszynski, G., Zejma, J., Zenner, J., Zsigmond, G., Afach, S., Ban, Gert, Bison, Georg, Bodek, K., Burghoff, M., Daum, M., Fertl, M., Franke, B., Grujić, Z.D., Hélaine, V., Kasprzak, Malgorzata, Kermaïdic, Y., Kirch, K., Knowles, Paul E., Koch, H.-C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, , T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Piegsa, F.M., Pignol, G., Prashanth, P.N., Quéméner, G., Rebreyend, D., Ries, D., Roccia, S., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Voigt, J., Weis, Antoine, Wyszynski, G., Zejma, J., Zenner, J., and Zsigmond, G.

Published
2015

41. Revised experimental upper limit on the electric dipole moment of the neutron

Author

Pendlebury, J. M., primary, Afach, S., additional, Ayres, N. J., additional, Baker, C. A., additional, Ban, G., additional, Bison, G., additional, Bodek, K., additional, Burghoff, M., additional, Geltenbort, P., additional, Green, K., additional, Griffith, W. C., additional, van der Grinten, M., additional, Grujić, Z. D., additional, Harris, P. G., additional, Hélaine, V., additional, Iaydjiev, P., additional, Ivanov, S. N., additional, Kasprzak, M., additional, Kermaidic, Y., additional, Kirch, K., additional, Koch, H.-C., additional, Komposch, S., additional, Kozela, A., additional, Krempel, J., additional, Lauss, B., additional, Lefort, T., additional, Lemière, Y., additional, May, D. J. R., additional, Musgrave, M., additional, Naviliat-Cuncic, O., additional, Piegsa, F. M., additional, Pignol, G., additional, Prashanth, P. N., additional, Quéméner, G., additional, Rawlik, M., additional, Rebreyend, D., additional, Richardson, J. D., additional, Ries, D., additional, Roccia, S., additional, Rozpedzik, D., additional, Schnabel, A., additional, Schmidt-Wellenburg, P., additional, Severijns, N., additional, Shiers, D., additional, Thorne, J. A., additional, Weis, A., additional, Winston, O. J., additional, Wursten, E., additional, Zejma, J., additional, and Zsigmond, G., additional

Published
2015
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42. A device for simultaneous spin analysis of ultracold neutrons

Author

Afach, S., primary, Ban, G., additional, Bison, G., additional, Bodek, K., additional, Chowdhuri, Z., additional, Daum, M., additional, Fertl, M., additional, Franke, B., additional, Geltenbort, P., additional, Grujić, Z. D., additional, Hayen, L., additional, Hélaine, V., additional, Henneck, R., additional, Kasprzak, M., additional, Kermaïdic, Y., additional, Kirch, K., additional, Komposch, S., additional, Kozela, A., additional, Krempel, J., additional, Lauss, B., additional, Lefort, T., additional, Lemière, Y., additional, Mtchedlishvili, A., additional, Naviliat-Cuncic, O., additional, Piegsa, F. M., additional, Pignol, G., additional, Prashanth, P. N., additional, Quéméner, G., additional, Rawlik, M., additional, Ries, D., additional, Rebreyend, D., additional, Roccia, S., additional, Rozpedzik, D., additional, Schmidt-Wellenburg, P., additional, Severijns, N., additional, Weis, A., additional, Wursten, E., additional, Wyszynski, G., additional, Zejma, J., additional, and Zsigmond, G., additional

Published
2015
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43. Observation of Gravitationally Induced Vertical Striation of Polarized Ultracold Neutrons by Spin-Echo Spectroscopy

Author

Afach, S., primary, Ayres, N. J., additional, Ban, G., additional, Bison, G., additional, Bodek, K., additional, Chowdhuri, Z., additional, Daum, M., additional, Fertl, M., additional, Franke, B., additional, Griffith, W. C., additional, Grujić, Z. D., additional, Harris, P. G., additional, Heil, W., additional, Hélaine, V., additional, Kasprzak, M., additional, Kermaidic, Y., additional, Kirch, K., additional, Knowles, P., additional, Koch, H.-C., additional, Komposch, S., additional, Kozela, A., additional, Krempel, J., additional, Lauss, B., additional, Lefort, T., additional, Lemière, Y., additional, Mtchedlishvili, A., additional, Musgrave, M., additional, Naviliat-Cuncic, O., additional, Pendlebury, J. M., additional, Piegsa, F. M., additional, Pignol, G., additional, Plonka-Spehr, C., additional, Prashanth, P. N., additional, Quéméner, G., additional, Rawlik, M., additional, Rebreyend, D., additional, Ries, D., additional, Roccia, S., additional, Rozpedzik, D., additional, Schmidt-Wellenburg, P., additional, Severijns, N., additional, Thorne, J. A., additional, Weis, A., additional, Wursten, E., additional, Wyszynski, G., additional, Zejma, J., additional, Zenner, J., additional, and Zsigmond, G., additional

Published
2015
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44. Measurement of a false electric dipole moment signal from 199Hg atoms exposed to an inhomogeneous magnetic field

Author

Afach, S., primary, Baker, C. A., additional, Ban, G., additional, Bison, G., additional, Bodek, K., additional, Chowdhuri, Z., additional, Daum, M., additional, Fertl, M., additional, Franke, B., additional, Geltenbort, P., additional, Green, K., additional, van der Grinten, M. G. D., additional, Grujic, Z., additional, Harris, P. G., additional, Heil, W., additional, Hélaine, V., additional, Henneck, R., additional, Horras, M., additional, Iaydjiev, P., additional, Ivanov, S. N., additional, Kasprzak, M., additional, Kermaïdic, Y., additional, Kirch, K., additional, Knowles, P., additional, Koch, H.-C., additional, Komposch, S., additional, Kozela, A., additional, Krempel, J., additional, Lauss, B., additional, Lefort, T., additional, Lemière, Y., additional, Mtchedlishvili, A., additional, Naviliat-Cuncic, O., additional, Pendlebury, J. M., additional, Piegsa, F. M., additional, Pignol, G., additional, Prashant, P. N., additional, Quéméner, G., additional, Rebreyend, D., additional, Ries, D., additional, Roccia, S., additional, Schmidt-Wellenburg, P., additional, Severijns, N., additional, Weis, A., additional, Wursten, E., additional, Wyszynski, G., additional, Zejma, J., additional, Zenner, J., additional, and Zsigmond, G., additional

Published
2015
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45. Gravitational depolarization of ultracold neutrons: Comparison with data

Author

Afach, S., primary, Ayres, N. J., additional, Baker, C. A., additional, Ban, G., additional, Bison, G., additional, Bodek, K., additional, Fertl, M., additional, Franke, B., additional, Geltenbort, P., additional, Green, K., additional, Griffith, W. C., additional, van der Grinten, M., additional, Grujić, Z. D., additional, Harris, P. G., additional, Heil, W., additional, Hélaine, V., additional, Iaydjiev, P., additional, Ivanov, S. N., additional, Kasprzak, M., additional, Kermaidic, Y., additional, Kirch, K., additional, Koch, H.-C., additional, Komposch, S., additional, Kozela, A., additional, Krempel, J., additional, Lauss, B., additional, Lefort, T., additional, Lemière, Y., additional, Musgrave, M., additional, Naviliat-Cuncic, O., additional, Pendlebury, J. M., additional, Piegsa, F. M., additional, Pignol, G., additional, Plonka-Spehr, C., additional, Prashanth, P. N., additional, Quéméner, G., additional, Rawlik, M., additional, Rebreyend, D., additional, Ries, D., additional, Roccia, S., additional, Rozpedzik, D., additional, Schmidt-Wellenburg, P., additional, Severijns, N., additional, Shiers, D., additional, Thorne, J. A., additional, Weis, A., additional, Wursten, E., additional, Zejma, J., additional, Zenner, J., additional, and Zsigmond, G., additional

Published
2015
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46. Highly stable atomic vector magnetometer based on free spin precession

Author

Afach, S., primary, Ban, G., additional, Bison, G., additional, Bodek, K., additional, Chowdhuri, Z., additional, Grujić, Z. D., additional, Hayen, L., additional, Hélaine, V., additional, Kasprzak, M., additional, Kirch, K., additional, Knowles, P., additional, Koch, H.-C., additional, Komposch, S., additional, Kozela, A., additional, Krempel, J., additional, Lauss, B., additional, Lefort, T., additional, Lemière, Y., additional, Mtchedlishvili, A., additional, Naviliat-Cuncic, O., additional, Piegsa, F. M., additional, Prashanth, P. N., additional, Quéméner, G., additional, Rawlik, M., additional, Ries, D., additional, Roccia, S., additional, Rozpedzik, D., additional, Schmidt-Wellenburg, P., additional, Severjins, N., additional, Weis, A., additional, Wursten, E., additional, Wyszynski, G., additional, Zejma, J., additional, and Zsigmond, G., additional

Published
2015
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47. A measurement of the neutron to 199 Hg magnetic moment ratio

Author

Afach, S., primary, Baker, C.A., additional, Ban, G., additional, Bison, G., additional, Bodek, K., additional, Burghoff, M., additional, Chowdhuri, Z., additional, Daum, M., additional, Fertl, M., additional, Franke, B., additional, Geltenbort, P., additional, Green, K., additional, van der Grinten, M.G.D., additional, Grujic, Z., additional, Harris, P.G., additional, Heil, W., additional, Hélaine, V., additional, Henneck, R., additional, Horras, M., additional, Iaydjiev, P., additional, Ivanov, S.N., additional, Kasprzak, M., additional, Kermaïdic, Y., additional, Kirch, K., additional, Knecht, A., additional, Koch, H.-C., additional, Krempel, J., additional, Kuźniak, M., additional, Lauss, B., additional, Lefort, T., additional, Lemière, Y., additional, Mtchedlishvili, A., additional, Naviliat-Cuncic, O., additional, Pendlebury, J.M., additional, Perkowski, M., additional, Pierre, E., additional, Piegsa, F.M., additional, Pignol, G., additional, Prashanth, P.N., additional, Quéméner, G., additional, Rebreyend, D., additional, Ries, D., additional, Roccia, S., additional, Schmidt-Wellenburg, P., additional, Schnabel, A., additional, Severijns, N., additional, Shiers, D., additional, Smith, K.F., additional, Voigt, J., additional, Weis, A., additional, Wyszynski, G., additional, Zejma, J., additional, Zenner, J., additional, and Zsigmond, G., additional

Published
2014
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48. Active compensation of magnetic field distortions based on vector spherical harmonics field description.

Author

Wyszyński, G., Bodek, K., Afach, S., Bison, G., Chowdhuri, Z., Daum, M., Franke, B., Komposch, S., Lauss, B., Ries, D., Zsigmond, G., Perkowski, M., Rozpedzik, D., Zejma, J., Fertl, M., Koss, P. A., Severijns, N., Wursten, E., Kirch, K., and Kozela, A.

Subjects
MAGNETIC fields, SPHERICAL harmonics, MAGNETOSTATICS
Abstract

An analytic solution to the magnetostatic inverse problem in the framework of vector spherical harmonic basis functions is presented. This formalism is used for the design of a spherical magnetic field compensation system and its performance is compared with an already existing rectangular coil system. The proposed set of spherical coils with 15 degrees of freedom achieves a shielding factor of 1000 or better in a large part of the volume enclosed by the coils for a dipolar type external perturbation. [ABSTRACT FROM AUTHOR]

Published
2017
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49. Dynamic stabilization of the magnetic field surrounding the neutron electric dipole moment spectrometer at the Paul Scherrer Institute

Author

Afach, S., primary, Bison, G., additional, Bodek, K., additional, Burri, F., additional, Chowdhuri, Z., additional, Daum, M., additional, Fertl, M., additional, Franke, B., additional, Grujic, Z., additional, Hélaine, V., additional, Henneck, R., additional, Kasprzak, M., additional, Kirch, K., additional, Koch, H.-C., additional, Kozela, A., additional, Krempel, J., additional, Lauss, B., additional, Lefort, T., additional, Lemière, Y., additional, Meier, M., additional, Naviliat-Cuncic, O., additional, Piegsa, F. M., additional, Pignol, G., additional, Plonka-Spehr, C., additional, Prashanth, P. N., additional, Quéméner, G., additional, Rebreyend, D., additional, Roccia, S., additional, Schmidt-Wellenburg, P., additional, Schnabel, A., additional, Severijns, N., additional, Voigt, J., additional, Weis, A., additional, Wyszynski, G., additional, Zejma, J., additional, Zenner, J., additional, and Zsigmond, G., additional

Published
2014
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50. Measurement of a false electric dipole moment signal from Hg atoms exposed to an inhomogeneous magnetic field.

Author

Afach, S., Baker, C., Ban, G., Bison, G., Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Green, K., Grinten, M., Grujic, Z., Harris, P., Heil, W., Hélaine, V., Henneck, R., Horras, M., Iaydjiev, P., and Ivanov, S.

Subjects
ELECTRIC dipole moments, SIGNAL processing, MERCURY analysis, ATOMS, INHOMOGENEOUS materials, MAGNETIC fields
Abstract

We report on the measurement of a Larmor frequency shift proportional to the electric-field strength for Hg atoms contained in a volume permeated with aligned magnetic and electric fields. This shift arises from the interplay between the inevitable magnetic field gradients and the motional magnetic field. The proportionality to electric-field strength makes it apparently similar to an electric dipole moment (EDM) signal, although unlike an EDM this effect is P- and T-conserving. We have used a neutron magnetic resonance EDM spectrometer, featuring a mercury co-magnetometer and an array of external cesium magnetometers, to measure the shift as a function of the applied magnetic field gradient. Our results are in good agreement with theoretical expectations. Graphical abstract: [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Published
2015
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