Author: "Severijns, N." / Publication Type: Electronic Resources - Searchworks@Jio Institute Digital Library Search Results

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76 results on '"Severijns, N."'

1. Achieving ultra-low and -uniform residual magnetic fields in a very large magnetically shielded room for fundamental physics experiments

Author: Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Bouillaud, T., Bowles, D., Chanel, E., Chen, W., Chiu, P. -J., Crawford, C. B., Naviliat-Cuncic, O., Doorenbos, C. B., Emmenegger, S., Fertl, M., Fratangelo, A., Griffith, W. C., Grujic, Z. D., Harris, P. G., Kirch, K., Kletzl, V., Krempel, J., Lauss, B., Lefort, T., Lejuez, A., Li, R., Mullan, P., Pacura, S., Pais, D., Piegsa, F. M., Rienäcker, I., Ries, D., Pignol, G., Rebreyend, D., Roccia, S., Rozpedzik, D., Saenz-Arevalo, W., Schmidt-Wellenburg, P., Schnabel, A., Segarra, E. P., Severijns, N., Svirina, K., Dinani, R. Tavakoli, Thorne, J., Vankeirsbilck, J., Voigt, J., Yazdandoost, N., Zejma, J., Ziehl, N., Zsigmond, G., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Bouillaud, T., Bowles, D., Chanel, E., Chen, W., Chiu, P. -J., Crawford, C. B., Naviliat-Cuncic, O., Doorenbos, C. B., Emmenegger, S., Fertl, M., Fratangelo, A., Griffith, W. C., Grujic, Z. D., Harris, P. G., Kirch, K., Kletzl, V., Krempel, J., Lauss, B., Lefort, T., Lejuez, A., Li, R., Mullan, P., Pacura, S., Pais, D., Piegsa, F. M., Rienäcker, I., Ries, D., Pignol, G., Rebreyend, D., Roccia, S., Rozpedzik, D., Saenz-Arevalo, W., Schmidt-Wellenburg, P., Schnabel, A., Segarra, E. P., Severijns, N., Svirina, K., Dinani, R. Tavakoli, Thorne, J., Vankeirsbilck, J., Voigt, J., Yazdandoost, N., Zejma, J., Ziehl, N., and Zsigmond, G.
Abstract: High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present the recent achievements of degaussing and equilibrating the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute. We present the final degaussing configuration that will be used for n2EDM after numerous studies. The optimized procedure results in a residual magnetic field that has been reduced by a factor of two. The ultra-low field is achieved with the full magnetic-field-coil system, and a large vacuum vessel installed, both in the MSR. In the inner volume of ~1.4 m^3, the field is now more uniform and below 300 pT. In addition, the procedure is faster and dissipates less heat into the magnetic environment, which in turn, reduces its thermal relaxation time from 12 h down to ~1.5 h.
Published: 2023

2. A large 'Active Magnetic Shield' for a high-precision experiment

Author: Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Bouillaud, T., Chanel, E., Chen, J., Chen, W., Chiu, P. -J., Crawford, C. B., Daum, M., Doorenbos, C. B., Emmenegger, S., Ferraris-Bouchez, L., Fertl, M., Fratangelo, A., Griffith, W. C., Grujic, Z. D., Harris, P., Kirch, K., Kletzl, V., Koss, P. A., Krempel, J., Lauss, B., Lefort, T., Mullan, P., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pignol, G., Rawlik, M., Rienäcker, I., Ries, D., Roccia, S., Rozpedzik, D., Saenz-Arevalo, W., Schmidt-Wellenburg, P., Schnabel, A., Segarra, E. P., Severijns, N., Shelton, T., Svirina, K., Dinani, R. Tavakoli, Thorne, J., Virot, R., Yazdandoost, N., Zejma, J., Ziehl, N., Zsigmond, G., Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Bouillaud, T., Chanel, E., Chen, J., Chen, W., Chiu, P. -J., Crawford, C. B., Daum, M., Doorenbos, C. B., Emmenegger, S., Ferraris-Bouchez, L., Fertl, M., Fratangelo, A., Griffith, W. C., Grujic, Z. D., Harris, P., Kirch, K., Kletzl, V., Koss, P. A., Krempel, J., Lauss, B., Lefort, T., Mullan, P., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pignol, G., Rawlik, M., Rienäcker, I., Ries, D., Roccia, S., Rozpedzik, D., Saenz-Arevalo, W., Schmidt-Wellenburg, P., Schnabel, A., Segarra, E. P., Severijns, N., Shelton, T., Svirina, K., Dinani, R. Tavakoli, Thorne, J., Virot, R., Yazdandoost, N., Zejma, J., Ziehl, N., and Zsigmond, G.
Abstract: We present a novel Active Magnetic Shield (AMS), designed and implemented for the n2EDM experiment at the Paul Scherrer Institute. The experiment will perform a high-sensitivity search for the electric dipole moment of the neutron. Magnetic-field stability and control is of key importance for n2EDM. A large, cubic, 5m side length, magnetically shielded room (MSR) provides a passive, quasi-static shielding-factor of about 10^5 for its inner sensitive volume. The AMS consists of a system of eight complex, feedback-controlled compensation coils constructed on an irregular grid spanned on a volume of less than 1000m^3 around the MSR. The AMS is designed to provide a stable and uniform magnetic-field environment around the MSR, while being reasonably compact. The system can compensate static and variable magnetic fields up to +-50muT (homogeneous components) and +-5muT (first-order gradients), suppressing them to a few muT in the sub-Hertz frequency range. The presented design concept and implementation of the AMS fulfills the requirements of the n2EDM experiment and can be useful for other applications, where magnetically silent environments are important and spatial constraints inhibit simpler geometrical solutions.
Published: 2023

3. Search for ultralight axion dark matter in a side-band analysis of a 199Hg free-spin precession signal

Author: Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Crawford, C. B., Daum, M., Dechenaux, B., Emmenegger, S., Flaux, P., Griffith, W. C., Harris, P. G., Kermaidic, Y., Kirch, K., Komposch, S., Koss, P. A., Krempel, J., Lauss, B., Lefort, T., Naviliat-Cuncic, O., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Rawlik, M., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Stadnik, Y. V., Thorne, J. A., Weis, A., Wursten, E., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Crawford, C. B., Daum, M., Dechenaux, B., Emmenegger, S., Flaux, P., Griffith, W. C., Harris, P. G., Kermaidic, Y., Kirch, K., Komposch, S., Koss, P. A., Krempel, J., Lauss, B., Lefort, T., Naviliat-Cuncic, O., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Rawlik, M., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Stadnik, Y. V., Thorne, J. A., Weis, A., Wursten, E., Zejma, J., and Zsigmond, G.
Abstract: Ultra-low-mass axions are a viable dark matter candidate and may form a coherently oscillating classical field. Nuclear spins in experiments on Earth might couple to this oscillating axion dark-matter field, when propagating on Earth's trajectory through our Galaxy. This spin coupling resembles an oscillating pseudo-magnetic field which modulates the spin precession of nuclear spins. Here we report on the null result of a demonstration experiment searching for a frequency modulation of the free spin-precession signal of \magHg in a \SI{1}{\micro\tesla} magnetic field. Our search covers the axion mass range $10^{-16}~\textrm{eV} \lesssim m_a \lesssim 10^{-13}~\textrm{eV}$ and achieves a peak sensitivity to the axion-nucleon coupling of $g_{aNN} \approx 3.5 \times 10^{-6}~\textrm{GeV}^{-1}$., Comment: 18 pages, 4 images, submitted to SciPost Physics
Published: 2022
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4. Search for ultralight axion dark matter in a side-band analysis of a 199Hg free-spin precession signal

Author: Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Crawford, C. B., Daum, M., Dechenaux, B., Emmenegger, S., Flaux, P., Griffith, W. C., Harris, P. G., Kermaidic, Y., Kirch, K., Komposch, S., Koss, P. A., Krempel, J., Lauss, B., Lefort, T., Naviliat-Cuncic, O., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Rawlik, M., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Stadnik, Y. V., Thorne, J. A., Weis, A., Wursten, E., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Crawford, C. B., Daum, M., Dechenaux, B., Emmenegger, S., Flaux, P., Griffith, W. C., Harris, P. G., Kermaidic, Y., Kirch, K., Komposch, S., Koss, P. A., Krempel, J., Lauss, B., Lefort, T., Naviliat-Cuncic, O., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Rawlik, M., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Stadnik, Y. V., Thorne, J. A., Weis, A., Wursten, E., Zejma, J., and Zsigmond, G.
Abstract: Ultra-low-mass axions are a viable dark matter candidate and may form a coherently oscillating classical field. Nuclear spins in experiments on Earth might couple to this oscillating axion dark-matter field, when propagating on Earth's trajectory through our Galaxy. This spin coupling resembles an oscillating pseudo-magnetic field which modulates the spin precession of nuclear spins. Here we report on the null result of a demonstration experiment searching for a frequency modulation of the free spin-precession signal of \magHg in a \SI{1}{\micro\tesla} magnetic field. Our search covers the axion mass range $10^{-16}~\textrm{eV} \lesssim m_a \lesssim 10^{-13}~\textrm{eV}$ and achieves a peak sensitivity to the axion-nucleon coupling of $g_{aNN} \approx 3.5 \times 10^{-6}~\textrm{GeV}^{-1}$., Comment: 18 pages, 4 images, submitted to SciPost Physics
Published: 2022
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5. The 'n2EDM MSR' -- a very large magnetically shielded room with an exceptional performance for fundamental physics measurements

Author: Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Bouillaud, T., Clement, B., Chanel, E., Chiu, P. -J., Crawford, C. B., Daum, M., Doorenbos, C. B., Emmenegger, S., Fratangelo, A., Fertl, M., Griffith, W. C., Grujic, Z. D., Harris, P. G., Kirch, K., Krempel, J., Lauss, B., Lefort, T., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pignol, G., Rauscher, G., Rebreyend, D., Rienäcker, I., Ries, D., Roccia, S., Rozpedzik, D., Saenz-Arevalo, W., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Shen, B., Staab, M., Svirina, K., Dinani, R. Tavakoli, Thorne, J., Yazdandoost, N., Zejma, J., Zsigmond, G., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Bouillaud, T., Clement, B., Chanel, E., Chiu, P. -J., Crawford, C. B., Daum, M., Doorenbos, C. B., Emmenegger, S., Fratangelo, A., Fertl, M., Griffith, W. C., Grujic, Z. D., Harris, P. G., Kirch, K., Krempel, J., Lauss, B., Lefort, T., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pignol, G., Rauscher, G., Rebreyend, D., Rienäcker, I., Ries, D., Roccia, S., Rozpedzik, D., Saenz-Arevalo, W., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Shen, B., Staab, M., Svirina, K., Dinani, R. Tavakoli, Thorne, J., Yazdandoost, N., Zejma, J., and Zsigmond, G.
Abstract: We present the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute which features an interior cubic volume with each side of length 2.92m, thus providing an accessible space of 25m3. The MSR has 87 openings up to 220mm diameter to operate the experimental apparatus inside, and an intermediate space between the layers for sensitive signal processing electronics. The characterization measurements show a remanent magnetic field in the central 1m3 below 100pT, and a field below 600pT in the entire inner volume, up to 4\,cm to the walls. The quasi-static shielding factor at 0.01\,Hz measured with a sinusoidal 2muT peak-to-peak signal is about 100,000 in all three spatial directions and rises fast with frequency to reach 10^8 above 1Hz., Comment: 10 pages, 15 Figures, submitted to Review of Scientific Instruments
Published: 2022
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6. 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

7. Mapping of the magnetic field to correct systematic effects in a neutron electric dipole moment experiment

Author: Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Chiu, P. -J., Clément, B., Crawford, C. B., Daum, M., Emmenegger, S., Ferraris-Bouchez, L., Fertl, M., Flaux, P., Fratangelo, A., Griffith, W. C., Grujić, Z. D., Harris, P. G., Hayen, L., Hild, N., Kasprzak, M., Kirch, K., Knowles, P., Koch, H. -C., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mohanmurthy, P., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Thorne, J. A., Virot, R., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Chiu, P. -J., Clément, B., Crawford, C. B., Daum, M., Emmenegger, S., Ferraris-Bouchez, L., Fertl, M., Flaux, P., Fratangelo, A., Griffith, W. C., Grujić, Z. D., Harris, P. G., Hayen, L., Hild, N., Kasprzak, M., Kirch, K., Knowles, P., Koch, H. -C., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mohanmurthy, P., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Thorne, J. A., Virot, R., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.
Abstract: Experiments dedicated to the measurement of the electric dipole moment of the neutron require outstanding control of the magnetic field uniformity. The neutron electric dipole moment (nEDM) experiment at the Paul Scherrer Institute uses a 199Hg co-magnetometer to precisely monitor magnetic field variations. This co-magnetometer, in the presence of field non-uniformity, is responsible for the largest systematic effect of this measurement. To evaluate and correct that effect, offline measurements of the field non-uniformity were performed during mapping campaigns in 2013, 2014 and 2017. We present the results of these campaigns, and the improvement the correction of this effect brings to the neutron electric dipole moment measurement.
Published: 2021
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8. A search for neutron to mirror-neutron oscillations

Author: Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Chiu, P. -J., Crawford, C., Daum, M., Dinani, R. T., Emmenegger, S., Flaux, P., Ferraris-Bouchez, L., Griffith, W. C., Grujic, Z. D., Hild, N., Kirch, K., Koch, H. -C., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Leredde, A., Mohanmurthy, P., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Rienaecker, I., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Thorne, J., Weis, A., Wursten, E., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Chiu, P. -J., Crawford, C., Daum, M., Dinani, R. T., Emmenegger, S., Flaux, P., Ferraris-Bouchez, L., Griffith, W. C., Grujic, Z. D., Hild, N., Kirch, K., Koch, H. -C., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Leredde, A., Mohanmurthy, P., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Rienaecker, I., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Thorne, J., Weis, A., Wursten, E., Zejma, J., and Zsigmond, G.
Abstract: It has been proposed that there could be a mirror copy of the standard model particles, restoring the parity symmetry in the weak interaction on the global level. Oscillations between a neutral standard model particle, such as the neutron, and its mirror counterpart could potentially answer various standing issues in physics today. Astrophysical studies and terrestrial experiments led by ultracold neutron storage measurements have investigated neutron to mirror-neutron oscillations and imposed constraints on the theoretical parameters. Recently, further analysis of these ultracold neutron storage experiments has yielded statistically significant anomalous signals that may be interpreted as neutron to mirror-neutron oscillations, assuming nonzero mirror magnetic fields. The neutron electric dipole moment collaboration performed a dedicated search at the Paul Scherrer Institute and found no evidence of neutron to mirror-neutron oscillations. Thereby, the following new lower limits on the oscillation time were obtained: $\tau_{nn'} > 352~$s at $B'=0$ (95% C.L.), $\tau_{nn'} > 6~\text{s}$ for all $0.4~\mu\text{T}9~\text{s}$ for all $5.0~\mu\text{T}
Published: 2020
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9. 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., Zsigmond, G., 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.
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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10. Towards nuclear structure with radioactive muonic atoms

Author: Skawran, A., Adamczak, A., Antognini, A., Berger, N., Cocolios, T. E., Dressler, R., Duellmann, C., Eichler, R., Indelicato, P., Jungmann, K., Kirch, K., Knecht, A., Krauth, J. J., Nuber, J., Papa, A., Pohl, R., Pospelov, M., Rapisarda, E., Renisch, D., Reiter, P., Ritjoho, N., Roccia, S., Severijns, N., Vogiatzi, S., Wauters, F., Willman, L., Skawran, A., Adamczak, A., Antognini, A., Berger, N., Cocolios, T. E., Dressler, R., Duellmann, C., Eichler, R., Indelicato, P., Jungmann, K., Kirch, K., Knecht, A., Krauth, J. J., Nuber, J., Papa, A., Pohl, R., Pospelov, M., Rapisarda, E., Renisch, D., Reiter, P., Ritjoho, N., Roccia, S., Severijns, N., Vogiatzi, S., Wauters, F., and Willman, L.
Abstract: The muX project at the Paul Scherrer Institut aims to perform high-resolution muonic atom X-ray spectroscopy for the extraction of nuclear charge radii of radioactive isotopes that can be handled only in microgram quantities. Measurements of the absolute charge radii of high-Z radioactive elements are complementary to the measurements of relative differences in mean-square radii along the isotopic chain available from laser spectroscopy. One of the major limitations of atomic structure calculations is related with the uncertainty of the nuclear charge radius. This is the case for the extraction of the Weinberg angle from atomic parity violation in Ra-226. A new approach to solve previous limitations of muonic atom X-ray spectroscopy experiments is the application of multiple muon transfer reactions in a high-pressure hydrogen gas cell with a small admixture of deuterium. The validity of this method has been demonstrated with a measurement with only 5 mu g of gold.
Published: 2019

11. Towards nuclear structure with radioactive muonic atoms

Author: Skawran, A., Adamczak, A., Antognini, A., Berger, N., Cocolios, T. E., Dressler, R., Duellmann, C., Eichler, R., Indelicato, P., Jungmann, K., Kirch, K., Knecht, A., Krauth, J. J., Nuber, J., Papa, A., Pohl, R., Pospelov, M., Rapisarda, E., Renisch, D., Reiter, P., Ritjoho, N., Roccia, S., Severijns, N., Vogiatzi, S., Wauters, F., Willman, L., Skawran, A., Adamczak, A., Antognini, A., Berger, N., Cocolios, T. E., Dressler, R., Duellmann, C., Eichler, R., Indelicato, P., Jungmann, K., Kirch, K., Knecht, A., Krauth, J. J., Nuber, J., Papa, A., Pohl, R., Pospelov, M., Rapisarda, E., Renisch, D., Reiter, P., Ritjoho, N., Roccia, S., Severijns, N., Vogiatzi, S., Wauters, F., and Willman, L.
Abstract: The muX project at the Paul Scherrer Institut aims to perform high-resolution muonic atom X-ray spectroscopy for the extraction of nuclear charge radii of radioactive isotopes that can be handled only in microgram quantities. Measurements of the absolute charge radii of high-Z radioactive elements are complementary to the measurements of relative differences in mean-square radii along the isotopic chain available from laser spectroscopy. One of the major limitations of atomic structure calculations is related with the uncertainty of the nuclear charge radius. This is the case for the extraction of the Weinberg angle from atomic parity violation in Ra-226. A new approach to solve previous limitations of muonic atom X-ray spectroscopy experiments is the application of multiple muon transfer reactions in a high-pressure hydrogen gas cell with a small admixture of deuterium. The validity of this method has been demonstrated with a measurement with only 5 mu g of gold.
Published: 2019

12. Magnetic-field uniformity in neutron electric-dipole-moment experiments

Author: Abel, C., Ayres, N. J., Baker, T., Ban, G., Bison, G., Bodek, K., Bondar, V., Crawford, C. B., Chiu, P.-J., Chanel, E., Chowdhuri, Z., Daum, M., Dechenaux, B., Emmenegger, S., Ferraris-Bouchez, L., Flaux, P., Geltenbort, P., Green, K., Griffith, W. C., Grinten, M. van der, Harris, P. G., Henneck, R., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Leredde, A., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Virot, R., Weis, Antoine, Wursten, E., Wyszynski, G., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Baker, T., Ban, G., Bison, G., Bodek, K., Bondar, V., Crawford, C. B., Chiu, P.-J., Chanel, E., Chowdhuri, Z., Daum, M., Dechenaux, B., Emmenegger, S., Ferraris-Bouchez, L., Flaux, P., Geltenbort, P., Green, K., Griffith, W. C., Grinten, M. van der, Harris, P. G., Henneck, R., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Leredde, A., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Virot, R., Weis, Antoine, Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.
Abstract: Magnetic-field uniformity is of the utmost importance in experiments to measure the electric dipole moment of the neutron. A general parametrization of the magnetic field in terms of harmonic polynomial modes is proposed, going beyond the linear- gradients approximation. We review the main undesirable effects of nonuniformities: depolarization of ultracold neutrons and Larmor frequency shifts of neutrons and mercury atoms. The theoretical predictions for these effects were verified by dedicated measurements with the single-chamber neutron electric-dipole-moment apparatus installed at the Paul Scherrer Institute.
Published: 2019

13. 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., Zsigmond, G., 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.
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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14. Magnetic field uniformity in neutron electric dipole moment experiments

Author: Abel, C., Ayres, N., Baker, T., Ban, G., Bison, G., Bodek, K., Bondar, V., Crawford, C., Chiu, P. -J., Chanel, E., Chowdhuri, Z., Daum, M., Dechenaux, B., Emmenegger, S., Ferraris-Bouchez, L., Flaux, P., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Harris, P. G., Henneck, R., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Leredde, A., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Virot, R., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zsigmond, G., Abel, C., Ayres, N., Baker, T., Ban, G., Bison, G., Bodek, K., Bondar, V., Crawford, C., Chiu, P. -J., Chanel, E., Chowdhuri, Z., Daum, M., Dechenaux, B., Emmenegger, S., Ferraris-Bouchez, L., Flaux, P., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Harris, P. G., Henneck, R., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Leredde, A., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Virot, R., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.
Abstract: Magnetic field uniformity is of the utmost importance in experiments to measure the electric dipole moment of the neutron. A general parametrization of the magnetic field in terms of harmonic polynomial modes is proposed, going beyond the linear-gradients approximation. We review the main undesirable effects of non-uniformities: depolarization of ultracold neutrons, and Larmor frequency shifts of neutrons and mercury atoms. The theoretical predictions for these effects were verified by dedicated measurements with the single-chamber nEDM apparatus installed at the Paul Scherrer Institute.
Published: 2018
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15. The n2EDM experiment at the Paul Scherrer Institute

Author: Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Chiu, P. -J., Clement, B., Crawford, C., Daum, M., Emmenegger, S., Flaux, P., Ferraris-Bouchez, L., Griffith, W. C., Grujić, Z. D., Harris, P. G., Heil, W., Hild, N., Kirch, K., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Leredde, A., Mohanmurthy, P., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Ross, K., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Thorne, J., Virot, R., Voigt, J., Weis, A., Wursten, E., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Chiu, P. -J., Clement, B., Crawford, C., Daum, M., Emmenegger, S., Flaux, P., Ferraris-Bouchez, L., Griffith, W. C., Grujić, Z. D., Harris, P. G., Heil, W., Hild, N., Kirch, K., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Leredde, A., Mohanmurthy, P., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Ross, K., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Thorne, J., Virot, R., Voigt, J., Weis, A., Wursten, E., Zejma, J., and Zsigmond, G.
Abstract: We present the new spectrometer for the neutron electric dipole moment (nEDM) search at the Paul Scherrer Institute (PSI), called n2EDM. The setup is at room temperature in vacuum using ultracold neutrons. n2EDM features a large UCN double storage chamber design with neutron transport adapted to the PSI UCN source. The design builds on experience gained from the previous apparatus operated at PSI until 2017. An order of magnitude increase in sensitivity is calculated for the new baseline setup based on scalable results from the previous apparatus, and the UCN source performance achieved in 2016., Comment: Submitted as a web of conference proceedings paper
Published: 2018
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16. Demonstration of sensitivity increase in mercury free-spin-precession magnetometers due to laser-based readout for neutron electric dipole moment searches

Author: Ban, G., Bison, G., Bodek, K., Daum, M., Fertl, M., Franke, B., Grujić, Z. D., Heil, W., Horras, M., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozel, A., Krempel, J., Lauss, B., Lefort, T., Mtchedlishvili, A., Pignol, G., Piegsa, F. M., Prashanth, P., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Weis, A., Wyszynski, G., Zejma, J., Zsigmond, G., Ban, G., Bison, G., Bodek, K., Daum, M., Fertl, M., Franke, B., Grujić, Z. D., Heil, W., Horras, M., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozel, A., Krempel, J., Lauss, B., Lefort, T., Mtchedlishvili, A., Pignol, G., Piegsa, F. M., Prashanth, P., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Weis, A., Wyszynski, G., Zejma, J., and Zsigmond, G.
Abstract: We report on a laser based $^{199}$Hg co-magnetometer deployed in an experiment searching for a permanent electric dipole moment of the neutron. We demonstrate a more than five times increased signal to-noise-ratio in a direct comparison measurement with its $^{204}$Hg discharge bulb-based predecessor. An improved data model for the extraction of important system parameters such as the degrees of absorption and polarization is derived. Laser- and lamp-based data-sets can be consistently described by the improved model which permits to compare measurements using the two different light sources and to explain the increase in magnetometer performance. The laser-based magnetometer satisfies the magnetic field sensitivity requirements for the next generation nEDM experiments.
Published: 2018
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17. Search for axionlike dark matter through nuclear spin precession in electric and magnetic fields

Author: Abel, C, Ayres, NJ, Ban, G, Bison, G, Bodek, K, Bondar, V, Daum, M, Fairbairn, M, Flambaum, VV, Geltenbort, P, Green, K, Griffith, WC, Van Der Grinten, M, Grujić, ZD, Harris, PG, Hild, N, Iaydjiev, P, Ivanov, SN, Kasprzak, M, Kermaidic, Y, Kirch, K, Koch, HC, Komposch, S, Koss, PA, Kozela, A, Krempel, J, Lauss, B, Lefort, T, Lemiére, Y, Marsh, DJE, Mohanmurthy, P, Mtchedlishvili, A, Musgrave, M, Piegsa, FM, Pignol, G, Rawlik, M, Rebreyend, D, Ries, D, Roccia, S, Rozpȩdzik, D, Schmidt-Wellenburg, P, Severijns, N, Shiers, D, Stadnik, YV, Weis, A, Wursten, E, Zejma, J, Zsigmond, G, Abel, C, Ayres, NJ, Ban, G, Bison, G, Bodek, K, Bondar, V, Daum, M, Fairbairn, M, Flambaum, VV, Geltenbort, P, Green, K, Griffith, WC, Van Der Grinten, M, Grujić, ZD, Harris, PG, Hild, N, Iaydjiev, P, Ivanov, SN, Kasprzak, M, Kermaidic, Y, Kirch, K, Koch, HC, Komposch, S, Koss, PA, Kozela, A, Krempel, J, Lauss, B, Lefort, T, Lemiére, Y, Marsh, DJE, Mohanmurthy, P, Mtchedlishvili, A, Musgrave, M, Piegsa, FM, Pignol, G, Rawlik, M, Rebreyend, D, Ries, D, Roccia, S, Rozpȩdzik, D, Schmidt-Wellenburg, P, Severijns, N, Shiers, D, Stadnik, YV, Weis, A, Wursten, E, Zejma, J, and Zsigmond, G
Abstract: We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of the spinprecession frequencies of stored ultracold neutrons and 199Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range 10-24 ≤ ma ≤ 10-17 eV. Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axion coupling to nucleons by up to a factor of 40.
Published: 2017

18. Search for axion-like dark matter through nuclear spin precession in electric and magnetic fields

Author: Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V. V., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Marsh, D. J. E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpędzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y. V., Weis, A., Wursten, E., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V. V., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Marsh, D. J. E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpędzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y. V., Weis, A., Wursten, E., Zejma, J., and Zsigmond, G.
Abstract: We report on a search for ultra-low-mass axion-like dark matter by analysing the ratio of the spin-precession frequencies of stored ultracold neutrons and $^{199}$Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range $10^{-24}~\textrm{eV} \le m_a \le 10^{-17}~\textrm{eV}$. Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axion coupling to nucleons by up to a factor of 40.
Published: 2017
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19. Search for axion-like dark matter through nuclear spin precession in electric and magnetic fields

Author: Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V. V., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Marsh, D. J. E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpędzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y. V., Weis, A., Wursten, E., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V. V., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Marsh, D. J. E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpędzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y. V., Weis, A., Wursten, E., Zejma, J., and Zsigmond, G.
Abstract: We report on a search for ultra-low-mass axion-like dark matter by analysing the ratio of the spin-precession frequencies of stored ultracold neutrons and $^{199}$Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range $10^{-24}~\textrm{eV} \le m_a \le 10^{-17}~\textrm{eV}$. Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axion coupling to nucleons by up to a factor of 40.
Published: 2017
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20. New laser polarization line at the ISOLDE facility

Author: Kowalska, M., Aschenbrenner, P., Baranowski, M, Bissell, Mark L, Gins, W., Harding, R. D., Heylen, H., Neyens, G., Pallada, Stavroula, Severijns, N., Velten, Ph, Walczak, M., Wienholtz, F., Xu, Z. Y., Yang, X. F., Zakoucky, D., Kowalska, M., Aschenbrenner, P., Baranowski, M, Bissell, Mark L, Gins, W., Harding, R. D., Heylen, H., Neyens, G., Pallada, Stavroula, Severijns, N., Velten, Ph, Walczak, M., Wienholtz, F., Xu, Z. Y., Yang, X. F., and Zakoucky, D.
Published: 2017

21. Search for axionlike dark matter through nuclear spin precession in electric and magnetic fields

Author: Abel, C., Ayres, N.?J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V.?V., Geltenbort, P., Green, K., Griffith, W.?C., Grinten, M. van der, Grujiæ, Z.?D., Harris, P.?G., Hild, N., Iaydjiev, P., Ivanov, S.?N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Koss, P.?A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemi?re, Y., Marsh, D.?J.?E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F.?M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpêdzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y.?V., Weis, Antoine, Wursten, E., Zejma, J., Zsigmond, G., Abel, C., Ayres, N.?J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V.?V., Geltenbort, P., Green, K., Griffith, W.?C., Grinten, M. van der, Grujiæ, Z.?D., Harris, P.?G., Hild, N., Iaydjiev, P., Ivanov, S.?N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Koss, P.?A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemi?re, Y., Marsh, D.?J.?E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F.?M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpêdzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y.?V., Weis, Antoine, Wursten, E., Zejma, J., and Zsigmond, G.
Abstract: We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of the spin-precession frequencies of stored ultracold neutrons and 199Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range 10−24≤ma≤10−17 eV. Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axion coupling to nucleons by up to a factor of 40.
Published: 2017

22. New laser polarization line at the ISOLDE facility

Author: Kowalska, M., Aschenbrenner, P., Baranowski, M, Bissell, Mark L, Gins, W., Harding, R. D., Heylen, H., Neyens, G., Pallada, Stavroula, Severijns, N., Velten, Ph, Walczak, M., Wienholtz, F., Xu, Z. Y., Yang, X. F., Zakoucky, D., Kowalska, M., Aschenbrenner, P., Baranowski, M, Bissell, Mark L, Gins, W., Harding, R. D., Heylen, H., Neyens, G., Pallada, Stavroula, Severijns, N., Velten, Ph, Walczak, M., Wienholtz, F., Xu, Z. Y., Yang, X. F., and Zakoucky, D.
Published: 2017

23. 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

24. 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

25. Perspectives for the VITO beam line at ISOLDE, CERN

Author: Schwengner, Ronald, Zuber, K., Garcia Ruiz, R.F., Bissel, M.L., Gottberg, A., Stachura, Monika Kinga, Hemmingsen, Lars Bo Stegeager, Neyens, G., Severijns, N., Schwengner, Ronald, Zuber, K., Garcia Ruiz, R.F., Bissel, M.L., Gottberg, A., Stachura, Monika Kinga, Hemmingsen, Lars Bo Stegeager, Neyens, G., and Severijns, N.
Published: 2015

26. 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

27. 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., Zsigmond, G., 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.
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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28. 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., Zsigmond, G., 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.
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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29. Perspectives for the VITO beam line at ISOLDE, CERN

Author: Schwengner, Ronald, Zuber, K., Garcia Ruiz, R.F., Bissel, M.L., Gottberg, A., Stachura, Monika Kinga, Hemmingsen, Lars Bo Stegeager, Neyens, G., Severijns, N., Schwengner, Ronald, Zuber, K., Garcia Ruiz, R.F., Bissel, M.L., Gottberg, A., Stachura, Monika Kinga, Hemmingsen, Lars Bo Stegeager, Neyens, G., and Severijns, N.
Published: 2015

30. 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., Zsigmond, G., 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.
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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31. 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., Zsigmond, G., 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.
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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32. 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., Zsigmond, G., 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.
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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33. Dynamic stabilization of the magnetic field surrounding the neutron electric dipole moment spectrometer at the Paul Scherrer Institute

Author: Afach, S., Bison, Georg, Bodek, K., Burri, F., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Grujic, Z., Hélaine, V., Henneck, R., Kasprzak, Malgorzata, Kirch, K., Koch, H.-C., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Meier, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quéméner, G., Rebreyend, D., Roccia, S., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Voigt, J., Weis, Antoine, Wyszynski, G., Zejma, J., Zenner, J., Zsigmond, G., Afach, S., Bison, Georg, Bodek, K., Burri, F., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Grujic, Z., Hélaine, V., Henneck, R., Kasprzak, Malgorzata, Kirch, K., Koch, H.-C., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Meier, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quéméner, G., Rebreyend, D., Roccia, S., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Voigt, J., Weis, Antoine, Wyszynski, G., Zejma, J., Zenner, J., and Zsigmond, G.
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 2.5 m × 2.5 m × 3 m, disturbances of the magnetic field are attenuated by factors of 5–50 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 neutron electric dipole moment 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.
Published: 2014

34. Testing isotropy of the universe using the Ramsey resonance technique on ultracold neutron spins

Author: Altarev, I., Ban, G., Bison, Georg, Bodek, K., Daum, M., Fertl, M., Fierlinger, P., Franke, B., Gutsmiedl, E., Heil, W., Henneck, R., Horras, M., Khomutov, N., Kirch, K., Kistryn, S., Kraft, A., Knecht, A., Knowles, Paul E., Kozela, A., Lauer, T., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Pazgalev, Anatoly S., Petzoldt, G., Piegsa, F.M., Pierre, E., Pignol, G., Quéméner, G., Rebetez, M., Rebreyend, D., Roccia, S., Schmidt-Wellenburg, P., Severijns, N., Sobolev, Yu., Weis, Antoine, Zejma, J., Zenner, J., Zsigmond, G., Altarev, I., Ban, G., Bison, Georg, Bodek, K., Daum, M., Fertl, M., Fierlinger, P., Franke, B., Gutsmiedl, E., Heil, W., Henneck, R., Horras, M., Khomutov, N., Kirch, K., Kistryn, S., Kraft, A., Knecht, A., Knowles, Paul E., Kozela, A., Lauer, T., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Pazgalev, Anatoly S., Petzoldt, G., Piegsa, F.M., Pierre, E., Pignol, G., Quéméner, G., Rebetez, M., Rebreyend, D., Roccia, S., Schmidt-Wellenburg, P., Severijns, N., Sobolev, Yu., Weis, Antoine, Zejma, J., Zenner, J., and Zsigmond, G.
Abstract: Physics at the Planck scale could be revealed by looking for tiny violations of fundamental symmetries in low energy experiments. In 2008, a sensitive test of the isotropy of the universe has been performed with stored ultracold neutrons (UCN), this is the first clock-comparison experiment performed with free neutrons. During several days we monitored the Larmor frequency of neutron spins in a weak magnetic field using the Ramsey resonance technique. A nonzero cosmic axial field, violating rotational symmetry, would induce a daily variation of the precession frequency. Our null result constitutes one of the most stringent tests of Lorentz invariance to date.
Published: 2011

35. Testing isotropy of the universe using the Ramsey resonance technique on ultracold neutron spins

Author: Altarev, I., Ban, G., Bison, G., Bodek, K., Daum, M., Fertl, M., Fierlinger, P., Franke, B., Gutsmiedl, E., Heil, W., Henneck, R., Horras, M., Khomutov, N., Kirch, K., Kistryn, S., Kraft, A., Knecht, A., Knowles, P., Kozela, A., Lauer, T., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Pazgalev, A., Petzoldt, G., Piegsa, F. M., Pierre, E., Pignol, G., Quéméner, G., Rebetez, M., Rebreyend, D., Roccia, S., Schmidt-Wellenburg, P., Severijns, N., Sobolev, Yu., Weis, A., Zejma, J., Zenner, J., Zsigmond, G., Altarev, I., Ban, G., Bison, G., Bodek, K., Daum, M., Fertl, M., Fierlinger, P., Franke, B., Gutsmiedl, E., Heil, W., Henneck, R., Horras, M., Khomutov, N., Kirch, K., Kistryn, S., Kraft, A., Knecht, A., Knowles, P., Kozela, A., Lauer, T., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Pazgalev, A., Petzoldt, G., Piegsa, F. M., Pierre, E., Pignol, G., Quéméner, G., Rebetez, M., Rebreyend, D., Roccia, S., Schmidt-Wellenburg, P., Severijns, N., Sobolev, Yu., Weis, A., Zejma, J., Zenner, J., and Zsigmond, G.
Abstract: Physics at the Planck scale could be revealed by looking for tiny violations of fundamental symmetries in low energy experiments. In 2008, a sensitive test of the isotropy of the Universe using has been performed with stored ultracold neutrons (UCN), this is the first clock-comparison experiment performed with free neutrons. During several days we monitored the Larmor frequency of neutron spins in a weak magnetic field using the Ramsey resonance technique. An non-zero cosmic axial field, violating rotational symmetry, would induce a daily variation of the precession frequency. Our null result constitutes one of the most stringent tests of Lorentz invariance to date., Comment: proceedings of the PNCMI2010 conference
Published: 2010
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36. Neutron to mirror-neutron oscillations in the presence of mirror magnetic fields

Author: Altarev, I., Baker, C. A., Ban, G., Bodek, K., Daum, M., Fierlinger, P., Geltenbort, P., Green, K., Grinten, M. G. D. van der, Gutsmiedl, E., Harris, P. G., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S., Khomutov, N., Kirch, K., Kistryn, S., Knecht, A., Knowles, Paul E., Kozela, A., Kuchler, F., Kuźniak, M., Lauer, T., Lauss, B., Lefort, T., Mtchedlishvili, A., Naviliat-Cuncic, O., Paul, S., Pazgalev, Anatoly, Pendlebury, J. M., Petzoldt, G., Pierre, E., Plonka-Spehr, C., Quéméner, G., Rebreyend, D., Roccia, S., Rogel, G., Severijns, N., Shiers, D., Sobolev, Yu., Stoepler, R., Weis, Antoine, Zejma, J., Zenner, J., Zsigmond, G., Altarev, I., Baker, C. A., Ban, G., Bodek, K., Daum, M., Fierlinger, P., Geltenbort, P., Green, K., Grinten, M. G. D. van der, Gutsmiedl, E., Harris, P. G., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S., Khomutov, N., Kirch, K., Kistryn, S., Knecht, A., Knowles, Paul E., Kozela, A., Kuchler, F., Kuźniak, M., Lauer, T., Lauss, B., Lefort, T., Mtchedlishvili, A., Naviliat-Cuncic, O., Paul, S., Pazgalev, Anatoly, Pendlebury, J. M., Petzoldt, G., Pierre, E., Plonka-Spehr, C., Quéméner, G., Rebreyend, D., Roccia, S., Rogel, G., Severijns, N., Shiers, D., Sobolev, Yu., Stoepler, R., Weis, Antoine, Zejma, J., Zenner, J., and Zsigmond, G.
Abstract: We performed ultracold neutron storage measurements to search for additional losses due to neutron (n) to mirror-neutron (n') oscillations as a function of an applied magnetic field B. In the presence of a mirror magnetic field B', ultracold neutron losses would be maximal for B~B'. We did not observe any indication for nn' oscillations and placed a lower limit on the oscillation time of taunn'>12.0 s at 95% C.L. for any B' between 0 and 12.5 µT.
Published: 2009

37. Additional results from the first dedicated search for neutron–mirror–neutron oscillations

Author: Bodek, K., Kistryn, S., Kuźniak, M., Zejma, J., Burghoff, M., Knappe-Grüneberg, S., Sander-Thoemmes, T., Schnabel, A., Trahms, L., Ban, G., Lefort, T., Naviliat-Cuncic, O., Khomutov, N., Knowles, Paul E., Pazgalev, Anatoly S., Weis, Antoine, Rogel, G., Quéméner, G., Rebreyend, D., Roccia, S., Bison, Georg, Severijns, N., Eberhardt, K., Hampel, G., Heil, W., Kratz, J.V., Lauer, T., Plonka-Spehr, C., Sobolev, Yu., Wiehl, N., Altarev, I., Fierlinger, P., Gutsmiedl, E., Paul, S., Stoepler, R., Daum, M., Henneck, R., Kirch, K., Knecht, A., Lauss, B., Mtchedlishvili, A., Petzoldt, G., Zsigmond, G., Bodek, K., Kistryn, S., Kuźniak, M., Zejma, J., Burghoff, M., Knappe-Grüneberg, S., Sander-Thoemmes, T., Schnabel, A., Trahms, L., Ban, G., Lefort, T., Naviliat-Cuncic, O., Khomutov, N., Knowles, Paul E., Pazgalev, Anatoly S., Weis, Antoine, Rogel, G., Quéméner, G., Rebreyend, D., Roccia, S., Bison, Georg, Severijns, N., Eberhardt, K., Hampel, G., Heil, W., Kratz, J.V., Lauer, T., Plonka-Spehr, C., Sobolev, Yu., Wiehl, N., Altarev, I., Fierlinger, P., Gutsmiedl, E., Paul, S., Stoepler, R., Daum, M., Henneck, R., Kirch, K., Knecht, A., Lauss, B., Mtchedlishvili, A., Petzoldt, G., and Zsigmond, G.
Abstract: The existence of a mirror world holding a copy of our ordinary particle spectrum could lead to oscillations between the neutron (n) and its mirror partner (n′). Such oscillations could manifest themselves in storage experiments with ultracold neutrons whose storage lifetime would depend on the applied magnetic field. Here, extended details and measurements from the first dedicated experimental search for nn′ oscillations published in [G. Ban, K. Bodek, M. Daum, R. Henneck, S. Heule, M. Kasprzak, N. Khomutov, K. Kirch, S. Kistryn, A. Knecht, P. Knowles, M. Kuźniak, T. Lefort, A. Mtchedlishvili, O. Naviliat-Cuncic, C. Plonka, G. Quéméner, M. Rebetez, D. Rebreyend, S. Roccia, G. Rogel, M. Tur, A. Weis, J. Zejma, G. Zsigmond, Direct experimental limit on neutron mirror–neutron oscillations, Phys. Rev. Lett. 99 (2007) 161603] will be presented, focussing on a possible dependence of the UCN counts on the magnetic field and its direction. However, at present no significant change in the averaged UCN counts with respect to the applied magnetic field has been found.
Published: 2009

38. Towards a new measurement of the neutron electric dipole moment

Author: Altarev, I., Ban, G., Bison, Georg, Bodek, K., Burghoff, M., Cvijovic, Milan, Daum, M., Fierlinger, P., Gutsmiedl, E., Hampel, G., Heil, W., Henneck, R., Horras, M., Khomutov, N., Kirch, K., Kistryn, S., Knappe-Grüneberg, S., Knecht, A., Knowles, Paul E., Kozela, A., Kratz, J. V., Kuchler, F., Kuźniak, M., Lauer, T., Lauss, B., Lefort, T., Mtchedlishvili, A., Naviliat-Cuncic, O., Paul, S., Pazgalev, Anatoly S., Petzoldt, G., Pierre, E., Plonka-Spehr, C., Quéméner, G., Rebreyend, D., Roccia, S., Rogel, G., Sander-Thoemmes, T., Schnabel, A., Severijns, N., Sobolev, Yu., Stoepler, R., Trahms, L., Weis, Antoine, Wiehl, N., Zejma, J., Zsigmond, G., Altarev, I., Ban, G., Bison, Georg, Bodek, K., Burghoff, M., Cvijovic, Milan, Daum, M., Fierlinger, P., Gutsmiedl, E., Hampel, G., Heil, W., Henneck, R., Horras, M., Khomutov, N., Kirch, K., Kistryn, S., Knappe-Grüneberg, S., Knecht, A., Knowles, Paul E., Kozela, A., Kratz, J. V., Kuchler, F., Kuźniak, M., Lauer, T., Lauss, B., Lefort, T., Mtchedlishvili, A., Naviliat-Cuncic, O., Paul, S., Pazgalev, Anatoly S., Petzoldt, G., Pierre, E., Plonka-Spehr, C., Quéméner, G., Rebreyend, D., Roccia, S., Rogel, G., Sander-Thoemmes, T., Schnabel, A., Severijns, N., Sobolev, Yu., Stoepler, R., Trahms, L., Weis, Antoine, Wiehl, N., Zejma, J., and Zsigmond, G.
Abstract: The effort towards a new measurement of the neutron electric dipole moment (nEDM) at the Paul Scherrer Institut's (PSI) new high intensity source of ultracold neutrons (UCN) is described. The experimental technique relies on Ramsey's method of separated oscillatory fields, using UCN in vacuum with the apparatus at ambient temperature. In the first phase, R&D towards the upgrade of the RAL/Sussex/ILL apparatus is being performed at the Institut Laue-Langevin (ILL). In the second phase the apparatus, moved from ILL to PSI, will allow an improvement in experimental sensitivity by a factor of 5. In the third phase, a new spectrometer should gain another order of magnitude in sensitivity. The improvements will be mainly due to (1) much higher UCN intensity, (2) improved magnetometry and magnetic field control, and (3) a double chamber configuration with opposite electric field directions.
Published: 2009

39. Test of Lorentz invariance with spin precession of ultracold neutrons

Author: Altarev, I., Baker, C. A., Ban, G., Bison, Georg, Bodek, K., Daum, M., Fierlinger, P., Geltenbort, P., Green, K., Grinten, M. G. D. van der, Gutsmiedl, E., Harris, P. G., Heil, W., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S. N., Khomutov, N., Kirch, K., Kistryn, S., Knecht, A., Knowles, Paul E., Kozela, A., Kuchler, F., Kuźniak, M., Lauer, T., Lauss, B., Lefort, T., Mtchedlishvili, A., Naviliat-Cuncic, O., Pazgalev, Anatoly, Pendlebury, J. M., Petzoldt, G., Pierre, E., Pignol, G., Quéméner, G., Rebetez, Martin, Rebreyend, D., Roccia, S., Rogel, G., Severijns, N., Shiers, D., Sobolev, Yu., Weis, Antoine, Zejma, J., Zsigmond, G., Altarev, I., Baker, C. A., Ban, G., Bison, Georg, Bodek, K., Daum, M., Fierlinger, P., Geltenbort, P., Green, K., Grinten, M. G. D. van der, Gutsmiedl, E., Harris, P. G., Heil, W., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S. N., Khomutov, N., Kirch, K., Kistryn, S., Knecht, A., Knowles, Paul E., Kozela, A., Kuchler, F., Kuźniak, M., Lauer, T., Lauss, B., Lefort, T., Mtchedlishvili, A., Naviliat-Cuncic, O., Pazgalev, Anatoly, Pendlebury, J. M., Petzoldt, G., Pierre, E., Pignol, G., Quéméner, G., Rebetez, Martin, Rebreyend, D., Roccia, S., Rogel, G., Severijns, N., Shiers, D., Sobolev, Yu., Weis, Antoine, Zejma, J., and Zsigmond, G.
Abstract: A clock comparison experiment, analyzing the ratio of spin precession frequencies of stored ultracold neutrons and ¹⁹⁹Hg atoms, is reported. No daily variation of this ratio could be found, from which is set an upper limit on the Lorentz invariance violating cosmic anisotropy field b⊥<2×10⁻²⁰ eV (95% C.L.). This is the first limit for the free neutron. This result is also interpreted as a direct limit on the gravitational dipole moment of the neutron |gn|<0.3 eV/c² m from a spin-dependent interaction with the Sun. Analyzing the gravitational interaction with the Earth, based on previous data, yields a more stringent limit |gn|<3×10⁻⁴ eV/c² m
Published: 2009

40. Beta-neutrino angular correlation in the decay of O-14 - Scalar coupling and interatomic interaction

Author: UCL - SC/PHYS - Département de physique, Vorobel, V., Briançon, C., Brudanin, V., Egorov, V., Deutsch, Jules, Prieels, René, Severijns, N., Shitov, Y, Vieu, C, Vylov, T., Yutlandov, I., Zaparov, S, UCL - SC/PHYS - Département de physique, Vorobel, V., Briançon, C., Brudanin, V., Egorov, V., Deutsch, Jules, Prieels, René, Severijns, N., Shitov, Y, Vieu, C, Vylov, T., Yutlandov, I., and Zaparov, S
Abstract: The positrons and coincident gamma-rays following the pure Fermi 0(+) --> 0(+) branch of beta(+)-decay in 140 were measured. The Doppler shift of the gamma-quantum observed is sensitive to the beta-neutrino correlation coefficient, which is unity (alpha = 1) in the absence of scalar coupling. The interatomic interaction of recoiling daughters was noticed, which has prevented to obtain an improved result for scalar coupling despite of the excellent statistical accuracy of the measurement. At the same time, it was shown that the method described can be used as a very sensitive and flexible tool to probe the interatomic interactions in matter at the hundred eV energy level. Perspectives in this direction as well as the future angular-correlation experiments aimed to search for scalar coupling in beta-decay are discussed.
Published: 2003

41. WITCH: A Penning trap retardation spectrometer combination for precision studies of the weak interaction

Author: UCL - Autre, Delaure, B., Beck, M., Golovko, VV, Kozlov, V, Phalet, T., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., Beck, D., Quint, W, Ames, F., Reisinger, K, Forstner, O, Deutsch, Jules, Bollen, G., Schwarz, S, UCL - Autre, Delaure, B., Beck, M., Golovko, VV, Kozlov, V, Phalet, T., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., Beck, D., Quint, W, Ames, F., Reisinger, K, Forstner, O, Deutsch, Jules, Bollen, G., and Schwarz, S
Abstract: The Weak Interaction Trap for CHarged particles (WITCH) setup is being installed at the ISOLDE-facility (CERN) to test the Standard Model of the electroweak interaction. This will be done by searching for scalar and tensor admixtures in nuclear beta decay. The beta-neutrino angular correlation is an excellent probe to determine the possible strength of those non-Standard Model contributions. The WITCH setup combines the unique storage features of a Penning trap to produce a scattering free radioactive source with a retardation spectrometer to measure the recoil energy spectrum of the daughter nuclei after beta decay with high precision. Physics beyond the Standard Model would lead to deviations from the expected spectral shape.
Published: 2003

42. WITCH: a recoil spectrometer for beta-decay

Author: UCL - Autre, Beck, M., Ames, F., Beck, D., Bollen, G., Delaure, B., Deutsch, Jules, Golovko, VV, Kozlov, VY, Kraev, IS, Lindroth, A, Phalet, T., Quint, W, Reisinger, K, Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., 14th International Conference on Electromagnetic Isotope Separators and Techniques Related the their Applications, UCL - Autre, Beck, M., Ames, F., Beck, D., Bollen, G., Delaure, B., Deutsch, Jules, Golovko, VV, Kozlov, VY, Kraev, IS, Lindroth, A, Phalet, T., Quint, W, Reisinger, K, Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., and 14th International Conference on Electromagnetic Isotope Separators and Techniques Related the their Applications
Abstract: The WITCH experiment will measure the recoil energy spectrum of the daughter ions in beta-decay. The main parts of the experiment are two Penning traps and a subsequent retardation spectrometer. The beta-decays take place in the ion cloud in the decay trap. Since the ion cloud is in vacuum and due to the cylindrical structure of the trap, the recoiling daughter ions can leave the cloud and the trap without any significant energy loss and can be energy analyzed in the retardation spectrometer. The WITCH experiment is set up foremost to study the electroweak interaction by measuring the beta-v angular correlation in nuclear beta-decay which can be inferred from the shape of the energy spectrum of the recoil ions. In the beginning the experiment will focus on pure Fermi decays which will allow to search for additional scalar coupling in the weak interaction. Since Penning traps have no restrictions regarding the element to be trapped the most suitable isotope can be picked for this purpose. The WITCH experiment is presently being set up at ISOLDE. Status and perspectives of the experiment will be presented in the following. (C) 2002 Elsevier Science B.V. All rights reserved.
Published: 2003

43. Quark Mixing, CKM Unitarity

Author: Abele, H., Barberio, E., Dubbers, D., Glueck, F., Hardy, J. C., Marciano, W. J., Serebrov, A., Severijns, N., Abele, H., Barberio, E., Dubbers, D., Glueck, F., Hardy, J. C., Marciano, W. J., Serebrov, A., and Severijns, N.
Abstract: In the Standard Model of elementary particles, quark-mixing is expressed in terms of a 3 x 3 unitary matrix V, the so called Cabibbo-Kobayashi-Maskawa (CKM) matrix. Significant unitarity checks are so far possible for the first row of this matrix. This article reviews the experimental and theoretical information on these matrix elements. On the experimental side, we find a 2.2 sigma to 2.7 sigma deviation from unitarity, which conflicts with the Standard Model., Comment: accepted by EPJ C
Published: 2003
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44. Quark Mixing, CKM Unitarity

Author: Abele, H., Barberio, E., Dubbers, D., Glueck, F., Hardy, J. C., Marciano, W. J., Serebrov, A., Severijns, N., Abele, H., Barberio, E., Dubbers, D., Glueck, F., Hardy, J. C., Marciano, W. J., Serebrov, A., and Severijns, N.
Abstract: In the Standard Model of elementary particles, quark-mixing is expressed in terms of a 3 x 3 unitary matrix V, the so called Cabibbo-Kobayashi-Maskawa (CKM) matrix. Significant unitarity checks are so far possible for the first row of this matrix. This article reviews the experimental and theoretical information on these matrix elements. On the experimental side, we find a 2.2 sigma to 2.7 sigma deviation from unitarity, which conflicts with the Standard Model., Comment: accepted by EPJ C
Published: 2003
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45. A novel approach for measuring the beta neutrino angular correlation in nuclear beta decay

Author: UCL - SC/PHYS - Département de physique, Beck, M., Beck, D., Delaure, B., Phalet, T., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., Ames, F., Schmidt, P., Bollen, G., Forstner, O., Dilling, J., Quint, W., Deutsch, Jules, Prieels, René, 7th International Symposium on Particles, Strings and Cosmology (PASCOS 99) 7th Conference on Intersections Between Particle and Nuclear Physics (CIPANP 2000), UCL - SC/PHYS - Département de physique, Beck, M., Beck, D., Delaure, B., Phalet, T., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., Ames, F., Schmidt, P., Bollen, G., Forstner, O., Dilling, J., Quint, W., Deutsch, Jules, Prieels, René, and 7th International Symposium on Particles, Strings and Cosmology (PASCOS 99) 7th Conference on Intersections Between Particle and Nuclear Physics (CIPANP 2000)
Published: 2002

46. Search for right-handed currents in the beta+ decay of Sb-118

Author: UCL - SC/PHYS - Département de physique, Vereecke, B., Beck, D., Beck, M., Delaure, B., Phalet, T., Schuurmans, P., Severijns, N., Versyck, S., Deutsch, Jules, Prieels, René, 7th Conference on Intersections Between Particle and Nuclear Physics (CIPANP 2000), UCL - SC/PHYS - Département de physique, Vereecke, B., Beck, D., Beck, M., Delaure, B., Phalet, T., Schuurmans, P., Severijns, N., Versyck, S., Deutsch, Jules, Prieels, René, and 7th Conference on Intersections Between Particle and Nuclear Physics (CIPANP 2000)
Published: 2002

47. Search for new physics in beta-neutrino correlations with the WITCH spectrometer

Author: UCL - SC/PHYS - Département de physique, Beck, D., Ames, F., Beck, M., Bollen, G., Delaure, B., Deutsch, Jules, Dilling, J., Forstner, O, Phalet, T., Prieels, René, Quint, W, Schmidt, P., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., 5th International Conference on Radioactive Nuclear Beams, UCL - SC/PHYS - Département de physique, Beck, D., Ames, F., Beck, M., Bollen, G., Delaure, B., Deutsch, Jules, Dilling, J., Forstner, O, Phalet, T., Prieels, René, Quint, W, Schmidt, P., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., and 5th International Conference on Radioactive Nuclear Beams
Abstract: The WITCH (Weak Interaction Trap for CHarged particles) experiment is a retardation spectrometer coupled to a Penning trap and measures the beta-neutrino angular correlation via the shape of the recoil energy spectrum. The present form of the Standard Model describes weak processes in terms of vector and axial-vector type interactions, but the possible presence of scalar and tensor interactions is not yet ruled out. The main aim of this experiment is a test of the Standard Model for possible admixture of scalar and tensor currents. (C) 2002 Elsevier Science B.V. All rights reserved.
Published: 2002

48. Positron polarization in the decay of polarized N-12: a precision test of the Standard Model

Author: UCL - SC/PHYS - Département de physique, Thomas, E., Prieels, René, Allet, M., Bodek, K., Camps, J., Deutsch, Jules, Gimeno-Nogues, F., Govaerts, Jan, Lang, J., Naviliat-Cuncic, O., Pepe, I., Quin, P., Severijns, N., Sromicki, J., UCL - SC/PHYS - Département de physique, Thomas, E., Prieels, René, Allet, M., Bodek, K., Camps, J., Deutsch, Jules, Gimeno-Nogues, F., Govaerts, Jan, Lang, J., Naviliat-Cuncic, O., Pepe, I., Quin, P., Severijns, N., and Sromicki, J.
Abstract: The longitudinal polarization of positrons emitted along and opposite to the nuclear spin direction has been measured in the decay of polarized N-12. The results are consistent with the Standard Model prediction. In manifest left-right symmetric models this measurement provides a lower bound of 310 GeV/c(2) at 90% CL on the mass of a possible right-handed gauge boson contributing to the electroweak interaction. In generalized versions of this model our measurement provides constraints complementary to those set by high-energy experiments. (C) 2001 Elsevier Science B.V. All rights reserved.
Published: 2001

49. Fundamental weak interaction studies using polarised nuclei and ion traps

Author: UCL - SC/PHYS - Département de physique, Severijns, N., Deutsch, Jules, Beck, D., Beck, M., Delaure, B., Phalet, T., Prieels, René, Schuurmans, P., Vereecke, B., Versyck, S., UCL - SC/PHYS - Département de physique, Severijns, N., Deutsch, Jules, Beck, D., Beck, M., Delaure, B., Phalet, T., Prieels, René, Schuurmans, P., Vereecke, B., and Versyck, S.
Abstract: Two experiments to search for new physics beyond the standard model for electroweak interactions by measuring correlations between different spin and momentum vectors in nuclear beta -decay are discussed. In the first experiment the correlation between the emission asymmetry and the longitudinal polarisation of positrons emitted by polarised nuclei is determined. This type of measurement is sensitive to the presence of right-handed currents but also to possible scalar and tensor-type currents in the weak interaction. The aim of the second experiment is to determine the beta nu -correlation in beta -decay by measuring the energy spectrum of the recoil ions, using a Penning trap and a retardation spectrometer. In this case the focus is on the search for scalar currents in the weak interaction. The results of the experiments presented here are complementary to results from experiments in muon decay and at high-energy colliders.
Published: 2000

50. Experiment AnCor: Search for scalar interaction in beta decay and mu capture

Author: UCL - SC/PHYS - Département de physique, Briancon, C., Brudanin, V.B., Egorov, V.G., Filipova, T.V., Petitjean, C., Severijns, N., Shitov, Yu.A., Vorobel, V., Vylov, Ts., Wiaux, V., Yutlandov, I.A., Zaparov, Sh., Deutsch, Jules, Govaerts, Jan, Prieels, René, 1st International Workshop on Nonaccelerator New Physics (NANP 97), UCL - SC/PHYS - Département de physique, Briancon, C., Brudanin, V.B., Egorov, V.G., Filipova, T.V., Petitjean, C., Severijns, N., Shitov, Yu.A., Vorobel, V., Vylov, Ts., Wiaux, V., Yutlandov, I.A., Zaparov, Sh., Deutsch, Jules, Govaerts, Jan, Prieels, René, and 1st International Workshop on Nonaccelerator New Physics (NANP 97)
Published: 1998

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