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Atomic Nuclei: Nuclear Spin State Population Distribution

Atomic Nuclei: Nuclear Spin State Population Distribution

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Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

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Atomic Nuclei: Magnetic Resonance

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Atomic Nuclei: Nuclear Magnetic Moment

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Related Experiment Video

Updated: Jun 24, 2026

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Published on: April 13, 2022

Ultracold Neutron Energy Spectrum and Storage Properties from Magnetically Induced Spin Depolarization.

N J Ayres¹, G Ban², G Bison³

¹ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zurich, Switzerland.

Physical Review Letters

|June 22, 2026

Summary

This summary is machine-generated.

We developed a new method to measure ultracold neutron energy spectra using spin depolarization. This technique also reveals how materials store neutrons, differentiating between specular and diffuse collisions.

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Last Updated: Jun 24, 2026

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Area of Science:

Atomic, Molecular & Optical Physics
Nuclear Physics
Materials Science

Background:

Ultracold neutrons (UCNs) are crucial for precision measurements like the neutron electric dipole moment and lifetime.
Understanding UCN storage properties is vital for minimizing systematic errors in experiments.
Current methods for analyzing UCN storage and energy spectra have limitations.

Purpose of the Study:

To present a novel method for extracting UCN energy spectra from spin depolarization data.
To utilize this method to probe the storage properties of UCN trapping materials.
To assess the sensitivity of the technique by comparing different storage chambers.

Main Methods:

Magnetically induced spin depolarization measurements using the n2EDM apparatus.
Utilizing tomat simulation to correlate UCN storage properties with magnetic field nonuniformities.
Analyzing the relationship between storage characteristics (specular vs. diffuse collisions) and UCN energy spectra.

Main Results:

Successfully extracted UCN energy spectra from spin depolarization measurements.
Demonstrated the method's sensitivity to differences in UCN storage properties between two experimental chambers.
Established a link between material storage characteristics and UCN energy spectrum.

Conclusions:

The presented method offers a novel approach to UCN energy spectrum extraction.
This technique is sensitive to UCN storage properties and material interactions.
The method is valuable for assessing systematic effects in precision experiments with spin-polarized systems.