Development of a Database for Prompt Gamma-ray Neutron Activation Analysis

Choi, H.D.; Firestone, R. B.; Lindstrom, Richard M.; Molnár, Gábor; Reddy, Α. V. R.; Tan, Vuong Huu; Zhou, Caijin; Paviotti-Corcuera, R.; Trkov, A.

doi:10.1080/00223131.2002.10875360

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…Our estimate of the densities of the levels included in the considered scintillators, carried out in this work on the basis of the thermodynamic model of reactions [9,10,11], is consistent with estimates of the multiplicity of gamma quanta in resonance capture reactions and the data of works [12][13]24], the results of the evaluation indicate the existence of low-energy gamma quanta emitted between the transitions of highly excited states of final nuclei, capable of effectively exciting the molecules of the oxide scintillator. The energy range of incident neutrons, for which the contributions of researched mechanisms of nuclear reactions involving neutrons can be realized, is also estimated.…”

Section: Eejp 4 (2023)supporting

confidence: 85%

“…Literary data also confirm the generation of a significant number of secondary cascade gamma quanta from inelastic scattering reactions [14], from radiation and resonance capture reactions [12,[15][16]. But, at the same time, it should be borne in mind that the data on the multiplicity of secondary gamma quanta, if not specified, were accumulated by the spectrometric technique during a long-time interval, and were processed in a delayed time mode.…”

Section: Eejp 4 (2023)mentioning

confidence: 99%

“…In works [12,24] the values of the multiplicity of gamma quanta arising in the radiation capture of neutrons on nuclei are given, i.e. from excited nuclei (A+1)*.…”

Section: Eejp 4 (2023)mentioning

confidence: 99%

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The Contributions to Registration Efficiency of The Fast Neutron Reactions on The Nuclei of The Heavy Oxide Scintillators

Onyshchenko,

Grynyov,

Yakymenko

et al. 2023

East Eur. J. Phys.

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The results of the study of the contributions of the interaction reactions of fast neutron sources of 239Pu-Be and 252Cf to the counting efficiency of registration by oxide scintillators CdWO4, ZnWO4, Bi4Ge3O12 and Gd2SiO5, presented. The amount of gamma quanta per input neutron emitted from final nuclei excited in the reactions of inelastic scattering (n, nʹγ)in, resonant scattering (n, n)res and capture (n, γ)res and radiation capture (n, γ)cap was measured. PMT R1307 operating in single-electron mode was used as a photodetector, the background rate was ~ 5*103 s-1. The measured efficiency ε for scintillators ø40x40 mm was 752 for ZWO, 532 for CWO, 37 for GSO, and 23 for BGO in "counts/neutron" units, measurement error rate ~ 3-5%. The formation of the detector response is influenced by the parameters of the scintillator nuclei, such as the values of the interaction cross sections in the resonance region, the density of nuclear levels of the final nuclei, the lifetime of excited nuclear states, the upper limit of the resonance region of the cross section, as well as the scintillation time and geometric parameters of the scintillators. A phenomenological model of the response of an oxide scintillator to fast neutrons is proposed.

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Section: Eejp 4 (2023)supporting

confidence: 85%

Section: Eejp 4 (2023)mentioning

confidence: 99%

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The Contributions to Registration Efficiency of The Fast Neutron Reactions on The Nuclei of The Heavy Oxide Scintillators

Onyshchenko,

Grynyov,

Yakymenko

et al. 2023

East Eur. J. Phys.

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“…of an IAEA Coordinated Research Project [7], and published in the Evaluated Gamma-ray Activation File (EGAF) [8].…”

Section: Introductionmentioning

confidence: 99%

Comparison of IUPAC k ₀ values and neutron cross sections to determine a self-consistent set of data for neutron activation analysis

Firestone

Révay²

2011

Proceedings in Radiochemistry

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Independent databases of nuclear constants for Neutron Activation Analysis (NAA) have been independently maintained by the physics and chemistry communities for many year. They contain thermal neturon cross sections σ 0, standardization values k 0, and transition probabilities P γ . Chemistry databases tend to rely upon direct measurements of the nuclear constants k 0 and P γ which are often published in chemistry journals while the physics databases typically include evaluated σ 0 and P γ data from a variety of experiments published mainly in physics journals. The IAEA/LBNL Evaluated Gamma-ray Activation File (EGAF) also contains prompt and delayed γ-ray cross sections σ γ from Prompt Gamma-ray Activation Analysis (PGAA) measurements that can also be used to determine k 0 and σ 0 values. As a result several independent databases of fundamental constants for NAA have evolved containing slightly different and sometimes discrepant results. An IAEA CRP for a Reference Database for Neutron Activation Analysis was established to compare these databases and investigate the possibilitiy of producing a self-consistent set of σ 0, k 0, σ γ , and P γ values for NAA and other applications. Preliminary results of this IAEA CRP comparison are given in this paper.

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“…It is essential to evaluate the accuracy of capture γ-cascades generated from codes like DICEBOX. The DICEBOX calculated γ-cascade spectrum of the 181 Ta(n,γ) reaction was compared to measured γ-lines from the Evaluated γ-ray Activation File (EGAF) [10] in Figure 6. The DICEBOX calculation used primary γintensities extracted from the 181 Ta thermal capture data set in the Evaluated Nuclear Structure Data File (ENSDF) [11].…”

Section: Further Analysismentioning

confidence: 99%

New Capabilities of the RPI γ-Multiplicity Detector to Measure γ-Production

et al. 2023

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Accurate modeling of γ-production in neutron capture reactions is critical for many applications including on-proliferation, safeguards and modeling nuclear reactors. To improve this work, the Rensselaer Polytechnic Institute (RPI) 16-segment γ-multiplicity NaI(Tl) detector at the Gaerttner Linear Accelerator (LINAC) Center has been upgraded by implementing a digital data acquisition system. The new digitized system records the γ-energy deposition distribution in each individual detector, and γ-multiplicity values as a function of neutron time-of-flight (TOF). With the new capabilities, high precision capture (and fission) yield measurements can be made, and the accuracy of simulation tools used to predict capture γ-cascades can be tested. To validate the updated system, an experiment was performed using a natural Ta sample to measure 181Ta and 180mTa resonance capture yield by detecting prompt γ-rays emitted from neutron capture interactions as a function of both neutron energy and measured γ-multiplicity of each capture event. The results confirm earlier measurements and agree with theoretical yield in the low energy resonance region from 1 to 20 eV. A 238U(n, γ) measurement was also performed to generate γ-spectra. For capture γ-cascades where the total γ-energy deposition is close to the neutron binding energy, γ-spectra were measured for individual resonance energies and observed γ-multiplicities. The results are comparable in shape to a recent measurement done using the Detector for Advanced Neutron Capture Experiments (DANCE) array at Los Alamos Neutron Science Center (LANSCE); however, differences need to be compared to Monte-Carlo n-particle simulations.

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Development of a Database for Prompt Gamma-ray Neutron Activation Analysis

Cited by 7 publications

References 2 publications

The Contributions to Registration Efficiency of The Fast Neutron Reactions on The Nuclei of The Heavy Oxide Scintillators

The Contributions to Registration Efficiency of The Fast Neutron Reactions on The Nuclei of The Heavy Oxide Scintillators

Comparison of IUPAC k ₀ values and neutron cross sections to determine a self-consistent set of data for neutron activation analysis

New Capabilities of the RPI γ-Multiplicity Detector to Measure γ-Production

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Development of a Database for Prompt Gamma-ray Neutron Activation Analysis

Cited by 7 publications

References 2 publications

The Contributions to Registration Efficiency of The Fast Neutron Reactions on The Nuclei of The Heavy Oxide Scintillators

The Contributions to Registration Efficiency of The Fast Neutron Reactions on The Nuclei of The Heavy Oxide Scintillators

Comparison of IUPAC k 0 values and neutron cross sections to determine a self-consistent set of data for neutron activation analysis

New Capabilities of the RPI γ-Multiplicity Detector to Measure γ-Production

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Comparison of IUPAC k ₀ values and neutron cross sections to determine a self-consistent set of data for neutron activation analysis