Polarized 3He as a probe for short-range spin-dependent interactions

Abstract

We have studied the relaxation of a spin-polarized gas in a magnetic field, in the presence of short-range spin-dependent interactions. As a main result we have established a link between the specific properties of the interaction and the dependence of the spin-relaxation rate on the magnitude of the holding magnetic field. This allows us to formulate a new, extremely sensitive method to study (pseudo-) magnetic properties at the sub-millimeter scale, which are difficult to access by other means. The method has been used as a probe for nucleon-nucleon axion-like P,T violating interactions which yields a two-order-of-magnitude improved constraint on the coupling strength ($g_s{g}_p$) as a function of the force range ($\lambda$): $g_s{g}_p{\lambda }^2<3\times 10^{-27}$ m${}^2$.

References in corpus (2)

• A New Constraint for the Coupling of Axion-like particles to Matter via Ultra-Cold Neutron Gravitational Experiments
• New constraints for CP-violating forces between nucleons in the range 10-4 cm - 1 cm

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