Speaker
Thomas Mulkey
Description
We report a search for exotic axial spin-dependent interactions between neutrons and electrons, which could signal new physics beyond the Standard Model. We employ a compensated ferrimagnetic target to realize a dense ensemble of polarized electrons with a magnetization that vanishes at a specific temperature, thereby enabling a sensitive search using polarized neutron spin rotation. This novel approach allows us to probe neutron spin-electron spin interactions with Yukawa ranges λ in the poorly-explored 10^{−8} ≤ λ ≤ 10^{−2} range, where we improve the upper limits on the coupling constant product g_{A}^{e} g_{A}^{n} by several orders of magnitude.
