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A device for simultaneous spin analysis of ultracold neutrons

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.

In: The European Physical Journal A, 2015, vol. 51, no. 11, p. 1-10

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...

A device for simultaneous spin analysis of ultracold neutrons

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.

In: The European Physical Journal A, 2015, vol. 51, no. 11, p. 1–10

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...

Observation of gravitationally induced vertical striation of polarized ultracold neutrons by spin-echo spectroscopy

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

In: Physical Review Letters, 2015, vol. 115, no. 16, p. 162502

We describe a spin-echo method for ultracold neutrons (UCNs) confined in a precession chamber and exposed to a |B0|=1 μT magnetic field. We have demonstrated that the analysis of UCN spin-echo resonance signals in combination with knowledge of the ambient magnetic field provides an excellent method by which to reconstruct the energy spectrum of a confined ensemble of neutrons. The method...

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,...

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

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.

In: Physica B: Condensed Matter, 2011, vol. 406, no. 12, p. 2365-2369

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...

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...