Improved accuracy of γ-ray intensities from basic principles for the calibration reaction N14(n,γ)N15

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Abstract

The N14(n,γ)N15 reaction is a primary source of high-energy γ rays for use in the calibration of detectors for other neutron-capture reactions. The γ-ray intensities of N15 produced by thermal neutron capture and the γ-ray detection efficiency function have been simultaneously determined from γ-peak areas alone using the basic principle of intensity balance. A least-squares fit was made to a new type of intensity balance calculation, combined with traditional efficiency fitting of radioactive sources. This latter ensures the compatibility with low-energy efficiencies, while providing an unbiased efficiency function for higher (up to 10 MeV) γ-ray energies. The calculation is based on the assumption that the N15 decay scheme is complete. From the internal consistency of the resulting intensities, it is believed that they are more accurate than previously published values. The same is true for the derived efficiency function.

Original languageEnglish
Article number024603
JournalPhysical Review C - Nuclear Physics
Volume74
Issue number2
DOIs
Publication statusPublished - 2006

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rays
thermal neutrons
compatibility
energy
neutrons
detectors
decay

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

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abstract = "The N14(n,γ)N15 reaction is a primary source of high-energy γ rays for use in the calibration of detectors for other neutron-capture reactions. The γ-ray intensities of N15 produced by thermal neutron capture and the γ-ray detection efficiency function have been simultaneously determined from γ-peak areas alone using the basic principle of intensity balance. A least-squares fit was made to a new type of intensity balance calculation, combined with traditional efficiency fitting of radioactive sources. This latter ensures the compatibility with low-energy efficiencies, while providing an unbiased efficiency function for higher (up to 10 MeV) γ-ray energies. The calculation is based on the assumption that the N15 decay scheme is complete. From the internal consistency of the resulting intensities, it is believed that they are more accurate than previously published values. The same is true for the derived efficiency function.",
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