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Wyświetlanie 1-10 z 12
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 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
Tytuł:
The design of the n2EDM experiment
Autorzy:
Yazdandoost, N.
Pignol, G.
Rawlik, M.
Ferraris-Bouchez, L.
Fertl, M.
Chen, J.
Fratangelo, A.
Bodek, Kazimierz
Menu, J.
Piegsa, F.M.
Krempel, J.
Schmidt-Wellenburg, P.
Daum, M.
Naviliat-Cuncic, O.
Schnabel, A.
Rebreyend, D.
Chanel, E.
Crawford, C.B.
Saenz, W.
Kirch, K.
Harris, P.G.
Zejma, Jacek
Touati, S.
Rozpędzik, Dagmara
Thorne, J.
Wursten, E.
Lefort, T.
Chiu, P.-J.
Ban, G.
Bouillaud, T.
Roccia, S.
Ayres, N.J.
Flaux, P.
Lauss, B.
Stapf, T.
Voigt, J.
Koss, P.A.
Zsigmond, G.
Mullins, D.A.
Quéméner, G.
Shen, B.
Goupillière, D.
Tavakoli Dinani, R.
Virot, R.
Ross, K.U.
Dechenaux, B.
Clément, B.
Griffith, W.C.
Lemière, Y.
Ries, D.
Svirina, K.
Bondar, V.
Leredde, A.
Rienäcker, I.
Meier, M.
Pais, D.
Doorenbos, C.B.
Grujic, Z.D.
Emmenegger, S.
Severijns, N.
Bienstman, L.
Bison, G.
Opis:
We present the design of a next-generation experiment, n2EDM, currently under construction at the ultracold neutron source at the Paul Scherrer Institute (PSI) with the aim of carrying out a high-precision search for an electric dipole moment of the neutron. The project builds on experience gained with the previous apparatus operated at PSI until 2017, and is expected to deliver an order of magnitude better sensitivity with provision for further substantial improvements. An overview is of the experimental method and setup is given, the sensitivity requirements for the apparatus are derived, and its technical design is described.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 12

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