New Upper Bounds on Exotic Neutron Spin-Electron Spin Interactions via Neutron Spin Rotation Measurements in a Compensated Ferrimagnet

• URL: http://arxiv.org/abs/2508.14243v1
• Date: Tue, 19 Aug 2025 20:01:14 GMT
• Title: New Upper Bounds on Exotic Neutron Spin-Electron Spin Interactions via Neutron Spin Rotation Measurements in a Compensated Ferrimagnet
• Authors: T. Mulkey, K. N. Lopez, C. D. Hughes, B. Hill, M. Van Meter, H. Wijeratne, J. C. Long, M. Sarsour, W. M. Snow, K. Li, R. Parajuli, S. Samiei, D. V. Baxter, M. Luxnat, Y. Zhang, C. Jiang, E. Stringfellow, J. Torres, R. Hobbs,
• Abstract summary: We search for exotic spin-spin interactions between neutrons and electrons using slow neutron polarimetric imaging through a dense medium of polarized electrons.<n>Average neutron spin rotation angle per unit length, $fracdbarphi_F5dz=[0.41pm6.30 (stat.)pm4.4 (sys.)]times10-3$ rad/m, is consistent with zero.
• Score: 0.13922999783908227
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report a search for exotic spin-spin interactions between neutrons and electrons which could signal new physics beyond the Standard Model using slow neutron polarimetric imaging through a dense medium of polarized electrons. Our dense polarized electron target is a ferrimagnet held at its magnetic compensation temperature, which realizes a polarized electron ensemble with zero net magnetization. We sought the spin rotation of transversely polarized neutrons from a neutron spin-electron spin interaction of the form $V_2=-g_A^eg_A^n\frac{\hbar c}{4\pi}\vec\sigma_e\cdot\vec\sigma_n\frac{e^{-r/\lambda_c}}{r}$, where $g_{A}^{e}$ and $g_{A}^{n}$ are the electron and neutron axial couplings, $\vec{\sigma_e}$ and $\vec{\sigma_n}$ are the electron and neutron spin, and $\lambda_c$ is the interaction range for an exotic axial vector interaction from massive spin-1 boson exchange of mass $\hbar c/\lambda_c$. The resulting average neutron spin rotation angle per unit length, $\frac{d\bar{\phi}_{F5}}{dz}=[0.41\pm6.30\ (stat.)\pm4.4\ (sys.)]\times10^{-3}$ rad/m, is consistent with zero. Our novel approach improves the previous upper limits on the coupling constant product $g_A^eg_A^n$ by several orders of magnitude in the poorly explored $10^{-8}\leq\lambda_c\leq10^{-2}$ range.

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