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Related Experiment Videos

Shock temperature measurement using neutron resonance spectroscopy.

V W Yuan1, J David Bowman, D J Funk

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|May 21, 2005
PubMed
Summary

Researchers directly measured temperature in shocked metals using neutron resonance Doppler broadening. Tungsten-182 resonances in molybdenum targets revealed temperatures under extreme shock conditions.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nuclear physics

Background:

  • Accurate temperature measurement in materials under shock compression is crucial for understanding material behavior.
  • Previous methods for determining temperature in shocked metals have limitations in precision and directness.

Purpose of the Study:

  • To directly measure the temperature of molybdenum shocked to high pressures (approx. 63 GPa).
  • To demonstrate the utility of neutron resonance Doppler broadening as a diagnostic tool for shocked materials.

Main Methods:

  • Utilized the 21.1-eV resonance of tungsten-182 (182W) as a temperature-sensitive probe.
  • Generated a planar shock in a molybdenum target using an explosively launched aluminum flyer.
  • Probed the shocked material with a short pulse of resonant neutrons and analyzed time-of-flight data.

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Main Results:

  • Successfully measured the temperature of molybdenum shocked to approximately 63 GPa.
  • The Doppler broadening of the 182W neutron resonance provided a direct temperature reading.

Conclusions:

  • Neutron resonance Doppler broadening is a viable and direct method for measuring temperature in shocked metals.
  • This technique offers a new pathway for studying material properties under extreme dynamic compression.