Cosmic Axion Spin Precession Experiment (CASPEr)

TL;DR

The paper proposes a novel experiment, CASPEr, to detect axion and ALP dark matter through nuclear spin precession induced by axion interactions, potentially exploring unexplored parameter space.

Contribution

It introduces a new experimental scheme using nuclear magnetic resonance techniques to search for axion-like particles as dark matter candidates.

Findings

Potential to probe axion masses below 10^-9 eV

Can explore parameter space beyond current limits

Uses established precision magnetometry techniques

Abstract

We propose an experiment to search for QCD axion and axion-like-particle (ALP) dark matter. Nuclei that are interacting with the background axion dark matter acquire time-varying CP-odd nuclear moments such as an electric dipole moment. In analogy with nuclear magnetic resonance, these moments cause precession of nuclear spins in a material sample in the presence of an electric field. Precision magnetometry can be used to search for such precession. An initial phase of this experiment could cover many orders of magnitude in ALP parameter space beyond the current astrophysical and laboratory limits. And with established techniques, the proposed experimental scheme has sensitivity to QCD axion masses m_a < 10^-9 eV, corresponding to theoretically well-motivated axion decay constants f_a > 10^16 GeV. With further improvements, this experiment could ultimately cover the entire range of masses m_a < 10^-6 eV, complementary to cavity searches.