Title: Test of Lorentz Invariance with Spin Precession of Ultracold Neutrons
Authors: Altarev, I. ×
Baker, C.A>
Ban, G.
Bison, G.
Bodek, K.
Daum, M.
Fierlinger, P.
Geltenbort, P.
Green, K.
van der Grinten, M.G.D.
Gutsmiedl, E.
Harris, P.G.
Heil, W.
Henneck, R.
Horras, M.
Iadjiev, P.
Ivanov, S.N.
Khomutov, N.
Kirch, K.
Kistryn, S.
Knecht, A.
Knowles, P.
Kozela, A.
Kuchler, F.
Kuzniak, M.
Lauer, T.
Lauss, B.
Lefort, T.
Mtchedlishvili, A.
Naviliat-Cuncic, O.
Pazgalev, A.
Pendlebury, J.M.
Petzoldt, G.
Pierre, E.
Pignol, G.
Quemener, G.
Rebetez, M.
Rebreyend, D.
Roccia, S.
Gorel, G.
Severijns, Natalis
Shiers, D.
Sobolev, Yu.
Weiss, A.
Zejma, J.
Zsigmond, G. #
Issue Date: 20-Aug-2009
Publisher: American Physical Society
Series Title: Physical Review Letters vol:103
Article number: 081602
Abstract: A clock comparison experiment, analyzing the ratio of spin precession frequencies of stored ultracold
neutrons and 199Hg atoms, is reported. No daily variation of this ratio could be found, from which is set an
upper limit on the Lorentz invariance violating cosmic anisotropy field b_orthogonal < 2 x 10^{-20} eV (95% C.L.).
This is the first limit for the free neutron. This result is also interpreted as a direct limit on the gravitational
dipole moment of the neutron |g_n| < 0.3 eV/c^2 m from a spin-dependent interaction with the Sun.
Analyzing the gravitational interaction with the Earth, based on previous data, yields a more stringent
limit |g_n| < 3 x 10^{-4} eV/c^2 m.
ISSN: 0031-9007
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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