Wall Relaxation of Polarised Helium-3 in Storage Cells as a Bound on Spin-Dependent Gradients
Year: 2026
Type: article
Abstract: This paper examines how the hundred-hour storage lifetime of polarised helium-3 in coated cells limits any spin-dependent gradient that would relax the polarisation. The system considered is polarised helium-3 stored for of order one hundred hours in a five-centimetre coated cell, and the observable is relaxation rate, per-spin energy sensitivity and gradient limit. 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: T1_s = 3.600e+05; relaxation_rate_per_s = 2.778e-06; energy_J = 2.929e-40; torsion_bound_per_m = 9.266e-15; gradient_bound_per_m2 = 1.853e-13; cell_size_m = 0.05. 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.
Author: Aldred, William Alexander
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225824024
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