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Neodymium neutron cross section measurements.

D P Barry1, M J Trbovich, Y Danon

  • 1Gaerttner LINAC Laboratory, Rensselaer Polytechnic Institute, Mechanical, Aerospace and Nuclear Engineering Department, Troy, NY 12180-3590, USA.

Radiation Protection Dosimetry
|December 31, 2005
PubMed
Summary

New measurements of neutron capture and transmission in neodymium provide more accurate resonance parameters. These findings refine calculations for the capture resonance integral, showing a 7% reduction compared to existing data.

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Area of Science:

  • Nuclear Physics
  • Neutron Scattering

Background:

  • Accurate nuclear data for neodymium isotopes is crucial for reactor physics and nuclear applications.
  • Previous resonance parameter evaluations had significant statistical uncertainties.

Purpose of the Study:

  • To precisely determine neutron resonance parameters for neodymium isotopes.
  • To calculate the capture resonance integral in the 1.0-500 eV energy range.
  • To improve the accuracy of nuclear data libraries.

Main Methods:

  • Neutron capture and transmission measurements using the time-of-flight technique at the Rensselaer Polytechnic Institute LINAC.
  • Utilized a 16-segment NaI(Tl) multiplicity detector for capture and a 6Li glass scintillation detector for transmission.
  • Analyzed data using the multilevel R-matrix Bayesian code SAMMY.

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Main Results:

  • Determined resonance parameters for all naturally occurring neodymium isotopes between 1.0-500 eV.
  • Calculated capture resonance integral of 32 ± 0.5 barn, approximately 7% lower than ENDF-B/VI.
  • Significantly reduced statistical uncertainties compared to previous studies.

Conclusions:

  • The new resonance parameters offer a more accurate representation of neodymium's neutron interaction properties.
  • This improved data can lead to enhanced nuclear reactor design and safety analyses.
  • The findings highlight the importance of precise experimental measurements for nuclear data validation.