B. Massak | Searcharxiv

arXiv2026

Constraints on Neutron-Electron Quantum Dark Forces

Interactions induced by dark matter particles which couple bilinearly to standard model particles through quantum fluctuations were termed quantum dark forces by Brax, Fichet, and Pignol, who constrained the mass and couplings of dark scalar, dark vector, and dark fermion bilinear exchange between nucleons. We extend their results to derive new constraints on quantum dark forces from bilinear scalar exchange between neutrons and electrons

hep-ph↗

arXiv2025

Using the Neutron Fizeau Effect and Neutron Interferometry to Measure Energy-Dependent Contributions to the Neutron Optical Potential

We propose a method to measure the energy dependence of the neutron optical potential $dV_{opt}/dE$ in the slow neutron energy regime. Our method makes essential use of a special property of the phase shift for a nonrelativistic neutron in moving matter, known as the neutron Fizeau effect. If a neutron traverses a medium which moves along the surfaces of its own parallel boundaries, the neutron only experiences a phase shift if the neutron optical potential of matter depends on the incident neutron energy. This feature of the neutron Fizeau effect can be combined with newly-developed forms of neutron interferometry to conduct sensitive measurements of $dV_{opt}/dE$. We describe some examples of scientific applications of this idea in the fields of neutron optics, subthreshold neutron-nucleus resonances, parity violation in low-energy p-wave neutron-nucleus resonances, and neutron scattering amplitudes of the nuclei of rare earth elements.

nucl-ex↗