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Updated: Jan 20, 2026

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Seismic noise in crystal neutron interferometry.

G Mana1, E Massa1

  • 1INRIM - Istituto Nazionale di Ricerca Metrologica Strada delle Cacce 91 10135Torino Italy.

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|January 19, 2026
PubMed
Summary

We estimate phase noise in a split-crystal interferometer using simultaneous X-rays and neutrons. Passive isolation reduces seismic and acoustic noise, crucial for sensitive neutron interferometry experiments.

Keywords:
interference fringesinterference visibilityneutron interferometryphase noiseseismic noisesplit-crystal interferometry

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Area of Science:

  • Physics
  • Materials Science
  • Instrumentation

Background:

  • Neutron interferometers are highly sensitive to environmental noise, including seismic and acoustic vibrations.
  • The low speed, flux, and long detection times of thermal neutrons exacerbate this sensitivity.
  • Split-crystal designs and extended interferometer arms further increase susceptibility to noise.

Purpose of the Study:

  • To estimate the root-mean-square phase noise in a split-crystal interferometer.
  • To assess the impact of passive isolation on noise reduction for simultaneous X-ray and neutron interferometry.
  • To provide foundational data for the design and operation of advanced interferometers.

Main Methods:

  • Developing a theoretical model for phase noise estimation.
  • Simulating noise contributions from seismic and acoustic sources.
  • Analyzing the effects of passive isolation techniques on interferometer performance.

Main Results:

  • Quantified the root-mean-square phase noise under passive isolation conditions.
  • Demonstrated the effectiveness of passive isolation in mitigating environmental noise.
  • Provided a quantitative basis for understanding noise limitations in dual-modality interferometry.

Conclusions:

  • Passive isolation is essential for minimizing phase noise in sensitive neutron interferometers.
  • The presented noise estimates support the design and operational stability of split-crystal interferometers.
  • This work contributes to advancing high-precision measurements using simultaneous X-ray and neutron interferometry.