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Neutron Spin Rotation in Polarised Xenon as a Bound on Spin-Torsion Coupling

Year: 2026
Type: article
Abstract: This paper examines how neutron spin rotation through polarised xenon gas limits a spin-dependent interaction that would rotate the neutron spin plane. The system considered is cold neutrons traversing polarised xenon at a density near 5 x 10^26 per cubic metre, and the observable is spin rotation angle per unit length and its implied energy scale. Evaluating the ordinary behaviour of the system and the spin-torsion contribution under explicit assumptions about polarisation and uniformity, and inverting the comparison at the stated laboratory precision, gives a quantitative bound rather than a qualitative assertion of smallness. The computed record is: rotation_sensitivity_rad_per_m = 2.000e-07; polarised_density_per_m3 = 5.000e+26; implied_energy_scale_J = 1.687e-38; wavelength_m = 4.000e-10. The torsion-related contribution is far below the level that would alter the ordinary behaviour of the system at current precision, and the value that would have produced a visible residual is stated so that future improvements can be assessed against it directly. No new measurement is reported. This study is simulated and computed from stated assumptions, not measured.
DOI: 10.5281/zenodo.24133876
Language: English
Open Access status: green
OpenAlex ID: W7225787179
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