Neutron diffraction constraint on spin-dependent short range interaction

TL;DR

This paper uses neutron diffraction experiments to set new constraints on short-range spin-dependent interactions, surpassing previous methods for ranges below 10^{-5}cm.

Contribution

It provides the first direct constraint on neutron-matter short-range pseudomagnetic interactions using crystal diffraction data.

Findings

Constraint on $g_s g_p$ improves existing limits for $ extless 10^{-5}$cm

Demonstrates the effectiveness of neutron diffraction in probing short-range interactions

Sets new bounds on scalar-pseudo-scalar coupling constants

Abstract

The direct constraint on the parameters of short range pseudomagnetic interaction of free neutron with matter is obtained from the recent test experiment on a search for neutron EDM by crystal-diffraction method. It is shown that this constraint on a product of scalar to pseudo-scalar coupling constants $g_s g_p$ is better than that of any other method for the range $\lambda < 10^{-5}$cm.