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Wyświetlanie 1-10 z 28
Tytuł:
Constraining interactions mediated by axion-like particles with ultracold neutrons
Autorzy:
Zenner, J.
Lefort, T.
Piegsa, F. M.
Daum, M.
Frakke, B.
Kirch, K.
Rebreyend, D.
Severijns, N.
Naviliat-Cuncic, O.
Zejma, Jacek
Ban, G.
Kermaidic, Y.
Bison, G.
Fertl, M.
Roccia, S.
Quemener, G.
Zsigmond, G.
Ries, D.
Komposch, S.
Mtchedlishvili, A.
Lemiere, Y.
Pignol, G.
Schnabel, A.
Helaine, V.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Lauss, B.
Kasprzak, M.
Grujic, Z. D.
Koch, H. C.
Afach, S.
Wyszyński, Grzegorz
Voigt, J.
Kozela, A.
Burghoff, M.
Prashanth, P. N.
Weis, A.
Krempel, J.
Knowles, P.
Opis:
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 Hg-199 atoms confined in the same volume. The measurement was performed in a similar to 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(S)g(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.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
A device for simultaneous spin analysis of ultracold neutrons
Autorzy:
Chowdhuri, Z.
Lefort, T.
Wursten, E.
Daum, M.
Rawlik, M.
Kirch, K.
Rebreyend, D.
Franke, B.
Severijns, N.
Halaine, V.
Rozpędzik, Dagmara
Rocchia, S.
Naviliat-Cuncic, O.
Zejma, Jacek
Ban, G.
Kermaidic, Y.
Bison, G.
Fertl, M.
Henneck, R.
Quemener, G.
Zsigmond, G.
Ries, D.
Komposch, S.
Mtchedlishvili, A.
Lemiere, Y.
Pignol, G.
Geltenbort, P.
Kazprzak, M.
Prashant, P. N.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Lauss, B.
Grujic, Z. D.
Afach, S.
Wyszyński, Grzegorz
Kozela, A.
Piegsa, F.
Weis, A.
Krempel, J.
Hayen, L.
Opis:
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.
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:
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
Wyświetlanie 1-10 z 28

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