Evaluation of Angular Distributions and Gamma-Ray Production Cross Sections for Iron

Savin, M.V.; Livke, Alexander; Nefedov, Yu. Ya.; Shvetsov, M S; Zvenigorodskii, A.G.; Blokhin, A. I.

doi:10.1080/00223131.2000.10874989

Cited by 3 publications

(6 citation statements)

References 10 publications

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“…Using this method we find σ γ = 200(41) mb. The overall uncertainty is dominated by an estimated 20% contribution from the CoH3 calculations [31], combined with an additional 2% contribution [17] assumed for the angulardistribution correction. In the absence of the angular distribution correction, however, Eq.…”

Section: Methodsmentioning

confidence: 99%

“…3.1 assumes complete nuclear alignment. In real physical problems, the alignment is usually only partial and an anisotropy-attenuation coefficient a k is needed to describe the degree of alignment, where In each plot, the data points have been digitized from the fitted curves published by Savin et al [17]. A cubic spline is used to provide a smooth interpolation throughout the range of the digitized sample.…”

Section: Experimental Angular-distribution Correctionmentioning

confidence: 99%

“…To obtain these quantities, we have digitized the fitted a 2 and a 4 data for the 846.8-keV γ-ray transition from Ref. [17] as shown in Fig. 4.…”

Section: Experimental Angular-distribution Correctionmentioning

confidence: 99%

“…The theoretical distribution is plotted assuming maximum alignment of the initial J = 2 state in 56 Fe (dotted gray curve). Experimental a 2 and a 4 coefficients[17] at the specified incident-neutron energy En indicated on the plot have been used to obtain the corresponding experimental distributions.…”

mentioning

confidence: 99%

“…Figure 4: Anisotropy-attenuation coefficients: (a) a 2 , and (b) a 4 , used to describe the angular distribution as a function of incident-neutron energy for the 846.8-keV γ ray corresponding to the 2 +1 → 0 + gs transition in 56 Fe. In each plot, the data points have been digitized from the fitted curves published by Savin et al[17]. A cubic spline is used to provide a smooth interpolation throughout the range of the digitized sample.…”

mentioning

confidence: 99%

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The Baghdad Atlas: A relational database of inelastic neutron-scattering (n,n′γ) data

Hurst

Bernstein

Kawano

et al. 2021

Nuclear Instruments and Methods in Physics Research Section A:

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A relational database has been developed based on the original (n, n γ) work carried out by A. M. Demidov et al., at the Nuclear Research Institute in Baghdad, Iraq ["Atlas of Gamma-Ray Spectra from the Inelastic Scattering of Reactor Fast Neutrons", Nuclear Research Institute, Baghdad, Iraq (Moscow, Atomizdat 1978)] for 105 independent measurements comprising 76 elemental samples of natural composition and 29 isotopically-enriched samples. The information from this Atlas includes: γ-ray energies and relative intensities; nuclide and level data corresponding to the residual nucleus and meta data associated with the target sample that allows for the extraction of the flux-weighted (n, n γ) cross sections for a given transition relative to a defined value. The optimized angular-distribution-corrected fast-neutron flux-weighted partial γ-ray cross section for the production of the 846.8-keV 2 + 1 → 0 + gs γ-ray transition in 56 Fe, determined to be σ γ = 143(29) mb, is used for this purpose. However, different values for the adopted cross section can be readily implemented to accommodate user preference based on revised determinations of this quantity. The Atlas (n, n γ) data has been compiled into a series of CSV-style ASCII data sets and a suite of Python scripts have been developed to build and install the database locally. The database can then be accessed directly through the SQLite engine, or using alternative methods such as the Jupyter Notebook Python-browser interface. Several examples exploiting different interaction methodologies are distributed with the complete software package.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Angular-distribution Correctionmentioning

confidence: 99%

“…To obtain these quantities, we have digitized the fitted a 2 and a 4 data for the 846.8-keV γ-ray transition from Ref. [17] as shown in Fig. 4.…”

Section: Experimental Angular-distribution Correctionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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The Baghdad Atlas: A relational database of inelastic neutron-scattering (n,n′γ) data

Hurst

Bernstein

Kawano

et al. 2021

Nuclear Instruments and Methods in Physics Research Section A:

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Prompt gamma rays induced by inelastic scattering of fission neutrons on iron

Ilic

Mauerhofer

Stieghorst

et al. 2020

J Radioanal Nucl Chem

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Prompt gamma rays induced by (n,n′γ) reactions on iron were measured with the instrument FanGaS (Fast Neutron induced Gamma-Ray Spectrometry) operated at the Heinz Maier-Leibnitz Zentrum (MLZ) in Garching. The measurement was performed at an angle of 90° between neutron beam and detector. The fast neutron flux at the sample position was determined to be 1.40 × 108 cm−2 s−1 by using the foil activation method. Energies, relative intensities and fast neutron spectrum averaged isotopic cross section for production of 81 prompt gamma lines are presented. The results obtained are found in good agreement with literature data. The new set of gamma lines is recommended to replace the old dataset with several new lines also recognizing a few false identifications. This work is an important step towards the future chemical analysis of large samples at FanGaS employing highly penetrating fission neutrons.

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