On observation of neutron quantum states in Earth gravitational field at Laue-Langevin Institute, Grenoble

TL;DR

This paper critically analyzes an experiment claiming to observe neutron quantum states in Earth's gravity, concluding that the claim lacks sufficient theoretical and experimental support.

Contribution

It provides a critical assessment of the experimental claims and challenges the validity of observing neutron gravitational quantum states.

Findings

The claim of observing neutron quantum states is not sufficiently supported.

The experimental and theoretical basis for the claim is flawed.

The study questions the utility of such observations for fundamental physics investigations.

Abstract

The experiment performed with ultra-cold neutrons at the Laue-Langevin Institute, Grenoble, is analyzed in view of the claim that ``neutron quantum states in Earth gravitational field'' are observed. Our conclusion is that the above claim is neither theoretically nor experimentally substantiated. We also criticize the statement that ``observation of the gravitationally bound quantum states of neutrons and the related experimental techniques provide a unique tool for a broad range of investigations in fundamental physics of particles and fields''.