# Spin - Rotation Coupling Observed in Neutron Interferometry

## TL;DR

This paper reports the experimental observation of spin-rotation coupling in neutrons using interferometry, confirming theoretical predictions and revealing inertial effects of intrinsic spin in quantum particles.

## Contribution

The study provides the first direct experimental evidence of spin-rotation coupling in neutrons through neutron interferometry, aligning with theoretical models.

## Key findings

- Observed phase shifts depend linearly on magnetic field rotation frequency
- Results agree with Pauli-Schrodinger equation predictions
- Demonstrates inertial properties of spin in quantum particles

## Abstract

Einstein's theory of general relativity and quantum theory form the two major pillars of modern physics. However, certain inertial properties of a particle's intrinsic spin are inconspicuous while the inertial properties of mass are well known. Here, by performing a neutron interferometric experiment, we observe phase shifts arising as a consequence of the spin's coupling with the angular velocity of a rotating magnetic field. The resulting phase shifts linearly depend on the frequency of the rotation of the magnetic field. Our results agree well with the predictions derived from the Pauli - Schr\"odinger equation.