Investigation of gamma-ray spectra from the inelastic scattering of reactor fast neutrons

Ahmed, Mohamed; Shakarchi, Kh.I.; Al-Najjar, S.A.R.; Al-Amili, M.A.; Govor, L. I.; Demidov, A.M.

doi:10.1016/0029-554x(74)90302-4

Cited by 25 publications

(19 citation statements)

References 10 publications

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“…Our value of β is appreciably larger (approximately 3.8 − 6.8%) than the values reported in Refs. [7,10], but falls within the expected range defined in Ref. [12].…”

Section: Neutron Fluxsupporting

confidence: 76%

“…This is evident from Fig. 1 where simple exponentials (assuming values of β = 0.72 [10] and β = 0.7473) are inadequate at reproducing the reported flux.…”

Section: Neutron Fluxmentioning

confidence: 94%

“…with exp(−0.72E n ): ∀ E n > 1.5 MeV [10]. In earlier work still, it is noted that this exponent may, in fact, vary from approximately β ≈ 0.65 − 0.75 [12] depending on the reactor type.…”

Section: Neutron Fluxmentioning

confidence: 98%

“…1, where the measured IRT-M data is taken from Refs. [7,10]. To a first approximation, the authors of the Atlas suggest the reactor neutron spectrum at E n > 1.0 MeV falls off according to the exponential-attenuation law of the form:…”

Section: Neutron Fluxmentioning

confidence: 99%

“…The fit (solid-orange curve) corresponds to an exponential of the form exp(−βEn), where β = 0.7473 and φ 0 = 32230 are determined from a fit to the data in the region En ≥ 2 MeV. An exponential of the form exp(−0.72En) [10] is also drawn for comparison (dashed-green curve); to obtain this function we fixed the value of β to 0.72 and φ 0 was treated as a free parameter determined in an independent fit to the region En ≥ 1.5 MeV.…”

Section: Neutron Fluxmentioning

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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“…Our value of β is appreciably larger (approximately 3.8 − 6.8%) than the values reported in Refs. [7,10], but falls within the expected range defined in Ref. [12].…”

Section: Neutron Fluxsupporting

confidence: 76%

“…This is evident from Fig. 1 where simple exponentials (assuming values of β = 0.72 [10] and β = 0.7473) are inadequate at reproducing the reported flux.…”

Section: Neutron Fluxmentioning

confidence: 94%