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Ayres, N J; Bison, G; Bodek, K; Bondar, V; Bouillaud, T; Chanel, E; Chiu, P-J; Clement, B; Crawford, C B; Daum, M; Doorenbos, C B; Emmenegger, S; Fertl, M; Flaux, P; Griffith, W C; Harris, P G; Hild, N; Kasprzak, M; Kirch, K; Kletzl, V; Koss, P A; Krempel, J; Lauss, B; Lefort, T; Mohanmurthy, P; Naviliat-Cuncic, O; Pais, D; Piegsa, F M; Pignol, G; Rawlik, M; Rienäcker, I; Ries, D; Roccia, S; Rozpedzik, D; Schmidt-Wellenburg, P; Severijns, N; Shen, B; Svirina, K; Tavakoli Dinani, R; Thorne, J A; Touati, S; Weis, A; Wursten, E; Yazdandoost, N; Zejma, J; Ziehl, N; Zsigmond, G
New journal of physics, 10/2023, Letnik: 25, Številka: 10Journal Article
Abstract 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 λ 2 < 8.3 × 10 − 28 m 2 (95% C.L.) in a range of 5 µ m < λ < 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.
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in: SICRIS
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