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Test of Lorentz invariance with spin precession of ultracold neutrons

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arxiv 0905.3221 v2 pith:FG6R5EU5 submitted 2009-05-20 nucl-ex

Test of Lorentz invariance with spin precession of ultracold neutrons

I. Altarev , C. A. Baker , G. Ban , G. Bison , K. Bodek , M. Daum , P. Fierlinger , P. Geltenbort
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K. Green M. G. D. van der Grinten E. Gutsmiedl P. G. Harris W. Heil R. Henneck M. Horras P. Iaydjiev S. N. Ivanov N. Khomutov K. Kirch S. Kistryn A. Knecht P. Knowles A. Kozela F. Kuchler M. Ku\'zniak T. Lauer B. Lauss T. Lefort A. Mtchedlishvili O. Naviliat-Cuncic A. Pazgalev J. M. Pendlebury G. Petzoldt E. Pierre G. Pignol G. Qu\'em\'ener M. Rebetez D. Rebreyend S. Roccia G. Rogel N. Severijns D. Shiers Yu. Sobolev A. Weis J. Zejma G. Zsigmond
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abstract

A clock comparison experiment, analyzing the ratio of spin precession frequencies of stored ultracold neutrons and $^{199}$Hg atoms is reported. %57 No daily variation of this ratio could be found, from which is set an upper limit on the Lorentz invariance violating cosmic anisotropy field $b_{\bot} < 2 \times 10^{-20} {\rm eV}$ (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 \times 10^{-4} $eV/$c^2 $m.

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  1. Towards Precise Simulations and Inference for the Neutron EDM

    nucl-th 2025-09 conditional novelty 6.0

    GEANT4 simulations of the SuperSUN ultracold neutron source are paired with neural simulation-based inference to recover UCN loss parameters from time-of-flight spectra.