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

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.

In: Physical Review A, 2019, vol. 99, no. 4, p. 042112

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...

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

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.

In: Physical Review D, 2015, vol. 92, no. 9, p. 092003

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...

Constraining interactions mediated by axion-like particles with ultracold neutrons

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.

In: Physics Letters B, 2015, vol. 745, p. 58–63

A measurement of the neutron to 199Hg magnetic moment ratio

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

In: Physics Letters B, 2014, vol. 739, p. 128–132

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

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

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.

In: Journal of Applied Physics, 2014, vol. 116, no. 8, p. 084510

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,...

The search for the neutron electric dipole moment at the Paul Scherrer Institute

Baker, C.A. ; Ban, G. ; Bodek, K. ; Burghoff, M. ; Chowdhuri, Z. ; Daum, M. ; Fertl, M. ; Franke, B. ; Geltenbort, P. ; Green, K. ; Grinten, M.G.D. van der ; Gutsmiedl, E. ; Harris, P.G. ; Henneck, R. ; Iaydjiev, P. ; Ivanov, S.N. ; Khomutov, N. ; Kasprzak, Malgorzata ; Kirch, K. ; Kistryn, S. ; Knappe-Gr̈uneberg, S. ; Knecht, A. ; Knowles, Paul E. ; Kozela, A. ; Lauss, B. ; Lefort, T. ; Lemière, Y. ; Naviliat-Cuncic, O. ; Pendlebury, J.M. ; Pierre, E. ; Piegsa, F.M. ; Pignol, G. ; Quéméner, G. ; Roccia, S. ; Schmidt-Wellenburg, P. ; Shiers, D. ; Smith, K.F. ; Schnabel, A. ; Trahms, L. ; Weis, Antoine ; Zejma, J. ; Zenner, J. ; Zsigmond, G.

In: Physics Procedia, 2011, vol. 17, p. 159-167

The measurement of the neutron electric dipole moment (nEDM) constrains the contribution of CP-violating terms within both the Standard Model and its extensions. The experiment uses ultracold neutrons (UCN) stored in vacuum at room temperature. This technique provided the last (and best) limit by the RAL/Sussex/ILL collaboration in 2006: dn < 2:9 × 10⁻²⁶ e cm (90% C.L.). We aim to improve...

Towards a new measurement of the neutron electric dipole moment

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.

In: Nuclear Instruments and Methods in Physics Research Section A, 2009, p. -

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...

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

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.

In: Nuclear Instruments and Methods in Physics Research Section A, 2009///doi: 10.1016/j.nima.2009.07.047

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...