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Wyświetlanie 1-10 z 92
Tytuł:
Search for ultralight axion dark matter in a side-band analysis of a $^{199}$Hg free-spin precession signal
Autorzy:
Lefort, T.
Piegsa, F. M.
Wursten, E.
Daum, M.
Dechenaux, B.
Rawlik, M.
Kirch, K.
Severijns, N.
Rozpędzik, Dagmara
Pignol, Guillaume
Schmidt-Wellenburg, Philipp
Flaux, P.
Ban, G.
Harris, P. G.
Kermaidic, Y.
Emmenegger, S.
Zejma, Jacek
Bondar, V.
Bison, G.
Roccia, Stephanie
Ries, D.
Komposch, S.
Thorne, J. A.
Ayres, N. J.
Griffith, W. C.
MohanMurthy, Prajwal
Naviliat Cuncic, Oscar
Bodek, Kazimierz
Lauss, B.
Abel, C.
Koss, P. A.
Stadnik, Y. V.
Zsigmond, Geza
Pais, D.
Crawford, C. B.
Chanel, E.
Weis, A.
Krempel, J.
Opis:
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 $^{199}$Hg in a 1 $\mu$T magnetic field. Our search covers the axion mass range 10$^{-16}$ eV $\lesssim$ m$_{a} \lesssim$ 10$^{-13}$ eV and achieves a peak sensitivity to the axion-nucleon coupling of g$_{aNN} \approx$ 3.5 $\times$ 10$^{-6}$ GeV$^{-1}$.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Data blinding for the nEDM experiment at PSI
Autorzy:
Emmenegger, S.
Kermaïdic, Y.
Krempel, J.
Ferraris-Bouchez, L.
Ries, D.
Leredde, A.
Chanel, E.
Bison, G.
Daum, M.
Roccia, S.
Hild, N.
Ban, G.
Bondar, V.
Lemiere, Y.
Naviliat-Cuncic, O.
Rozpędzik, Dagmara
Weis, A.
Lauss, B.
Schnabel, A.
Ayres, N. J.
Grujić, Z.
Kasprzak, M.
Pignol, G.
Rienäcker, I.
Zsigmond, G.
Lefort, T.
Piegsa, F. M.
Wursten, E.
Virot, R.
Kozela, A.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Crawford, C. B.
Chiu, P.-J.
Mohanmurthy, P.
Rebreyend, D.
Harris, P. G.
Flaux, P.
Kirch, K.
Rawlik, M.
Komposch, S.
Pais, D.
Hommet, J.
Zejma, Jacek
Mtchedlishvili, A.
Opis:
Psychological bias towards, or away from, prior measurements or theory predictions is an intrinsic threat to any data analysis. While various methods can be used to try to avoid such a bias, e.g. actively avoiding looking at the result, only data blinding is a traceable and trustworthy method that can circumvent the bias and convince a public audience that there is not even an accidental psychological bias. Data blinding is nowadays a standard practice in particle physics, but it is particularly difficult for experiments searching for the neutron electric dipole moment (nEDM), as several cross measurements, in particular of the magnetic field, create a self-consistent network into which it is hard to inject a false signal. We present an algorithm that modifies the data without influencing the experiment. Results of an automated analysis of the data are used to change the recorded spin state of a few neutrons within each measurement cycle. The flexible algorithm may be applied twice (or more) to the data, thus providing the option of sequentially applying various blinding offsets for separate analysis steps with independent teams. The subtle manner in which the data are modified allows one subsequently to adjust the algorithm and to produce a re-blinded data set without revealing the initial blinding offset. The method was designed for the 2015/2016 measurement campaign of the nEDM experiment at the Paul Scherrer Institute. However, it can be re-used with minor modification for the follow-up experiment n2EDM, and may be suitable for comparable projects elsewhere.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The very large n2EDM magnetically shielded room with an exceptional performance for fundamental physics measurements
Autorzy:
Emmenegger, S.
Kirch, K.
Doorenbos, C. B.
Harris, P. G.
Saenz-Arevalo, W.
Roccia, S.
Ries, D.
Pais, D.
Thorne, J.
Lefort, T.
Griffith, W. C.
Tavakoli Dinani, R.
Zsigmond, G.
Crawford, C. B.
Ban, G.
Piegsa, F. M.
Bison, G.
Bondar, V.
Fertl, M.
Krempel, J.
Rienäcker, I.
Schnabel, A.
Zejma, Jacek
Lauss, B.
Schmidt-Wellenburg, P.
Fratangelo, A.
Pignol, G.
Chanel, E.
Ayres, N. J.
Shen, B.
Svirina, K.
Rozpędzik, Dagmara
Bodek, Kazimierz
Clement, B.
Rebreyend, D.
Staab, M.
Bouillaud, T.
Daum, M.
Chiu, P.-J.
Yazdandoost, N.
Rauscher, G.
Naviliat-Cuncic, O.
Severijns, N.
Grujic, Z. D.
Opis:
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 2.92 m, thus providing an accessible space of 25 m$^{3}$. The MSR has 87 openings of diameter up to 220 mm for operating the experimental apparatus inside and an intermediate space between the layers for housing sensitive signal processing electronics. The characterization measurements show a remanent magnetic field in the central 1 m$^{3}$ below 100 pT and a field below 600 pT 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 2$\mu$T peak-to-peak signal is about 100 000 in all three spatial directions and increases rapidly with frequency to reach 10$^{8}$ above 1 Hz.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Measurement of a false electric dipole moment signal from ^{199}Hg atoms exposed to an inhomogeneous magnetic field
Autorzy:
Chowdhuri, Z.
Grujic, Z.
Lefort, T.
Zenner, J.
Horras, M.
Piegsa, F. M.
Wursten, E.
Daum, M.
Severijns, N.
Kirch, K.
Rebreyend, D.
Franke, B.
Green, K.
Naviliat-Cuncic, O.
Harris, P. G.
Kermaidic, Y.
Zejma, Jacek
Bison, G.
Fertl, M.
van der Grinten, M. G. D.
Henneck, R.
Pendlebury, J. M.
Quemener, G.
Roccia, S.
Zsigmond, G.
Ries, D.
Komposch, S.
Mtchedlishvili, A.
Heil, W.
Lemiere, Y.
Pignol, G.
Geltenbort, P.
Ivanov, S. N.
Iaydjiev, P.
Helaine, V.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Kasprzak, M.
Lauss, B.
Koch, H. C.
Afach, S.
Wyszyński, Grzegorz
Kozela, A.
Prashanth, P. N.
Ban, B.
Weis, A.
Krempel, J.
Knowles, P.
Opis:
We report on the measurement of a Larmor frequency shift proportional to the electric-field strength for Hg-199 atoms contained in a volume permeated with aligned magnetic and electric fields. This shift arises from the interplay between the inevitable magnetic field gradients and the motional magnetic field. The proportionality to electric-field strength makes it apparently similar to an electric dipole moment (EDM) signal, although unlike an EDM this effect is P- and T-conserving. We have used a neutron magnetic resonance EDM spectrometer, featuring a mercury co-magnetometer and an array of external cesium magnetometers, to measure the shift as a function of the applied magnetic field gradient. Our results are in good agreement with theoretical expectations.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The n2EDM experiment at the Paul Scherrer Institute
Autorzy:
Emmenegger, S.
Kirch, K.
Crawford, C.
Roccia, S.
Ries, D.
Pais, D.
Thorne, J.
Lefort, T.
Griffith, W. C.
Ross, K.
Wursten, E.
Rawlik, M.
Leredde, A.
Zsigmond, G.
Ban, G.
Piegsa, F. M.
Bison, G.
Bondar, V.
Krempel, J.
Schnabel, A.
Zejma, Jacek
Lauss, B.
Schmidt-Wellenburg, P.
Flaux, P.
Mohanmurthy, P.
Kozela, A.
Pignol, G.
Chanel, E.
Ayres, N. J.
Ferraris-Bouchez, L.
Rozpędzik, Dagmara
Virot, R.
Bodek, Kazimierz
Clement, B.
Weis, A.
Rebreyend, D.
Grujić, Z. D.
Koss, P. A.
Daum, M.
Lemière, Y.
Chiu, P.-J.
Harris, P. G.
Heil, W.
Voigt, J.
Abel, C.
Naviliat-Cuncic, O.
Severijns, N.
Hild, N.
Opis:
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.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI
Autorzy:
Bouillaud, T.
Emmenegger, S.
Thorne, J. A.
Krempel, J.
Touati, S.
Severijns, N.
Ries, D.
Chanel, E.
Bison, G.
Daum, M.
Yazdandoost, N.
Griffith, W. C.
Roccia, S.
Hild, N.
Koss, P. A.
Bondar, V.
Naviliat-Cuncic, O.
Rozpędzik, Dagmara
Weis, A.
Lauss, B.
Fertl, M.
Ziehl, N.
Ayres, N. J.
Kasprzak, M.
Pignol, G.
Rienäcker, I.
Zsigmond, G.
Tavakoli Dinani, R.
Lefort, T.
Wursten, E.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Doorenbos, C. B.
Crawford, C. B.
Chiu, P.-J.
Mohanmurthy, P.
Svirina, K.
Clement, B.
Harris, P. G.
Flaux, P.
Shen, B.
Kirch, K.
Kletzl, V.
Rawlik, M.
Pais, D.
Zejma, Jacek
Piegsa, F. M.
Opis:
We report on a search for a new, short-range, spin-dependent interaction using a modified version of the experimental apparatus used to measure the permanent neutron electric dipole moment at the Paul Scherrer Institute. This interaction, which could be mediated by axion-like particles, concerned the unpolarized nucleons (protons and neutrons) near the material surfaces of the apparatus and polarized ultracold neutrons stored in vacuum. The dominant systematic uncertainty resulting from magnetic-field gradients was controlled to an unprecedented level of approximately 4 pT cm$^{−1}$ using an array of optically-pumped cesium vapor magnetometers and magnetic-field maps independently recorded using a dedicated measurement device. No signature of a theoretically predicted new interaction was found, and we set a new limit on the product of the scalar and the pseudoscalar couplings $g_{s}g_{p}\lambda^{2}$ < 8.3 $\times$ 10$^{-28}$ m$^{2}$ (95% C.L.) in a range of 5 µm < $\lambda$ < 25 mm for the monopole–dipole interaction. This new result confirms and improves our previous limit by a factor of 2.7 and provides the current tightest limit obtained with free neutrons.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 92

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