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Title: Compilation of the ``Atlas of Gamma-rays from the Inelastic Scattering of Reactor Fast Neutrons'' (1978DE41) by A.M. Demidov, L.I. Govor, Yu. K. Cherepantsev, M.R. Ahmed, S. Al-Najjar, M.A. Al-Amili, N. Al-Assafi, and N. Rammo

Abstract

A Structured Query Language (SQL) relational database has been developed based on the original (n,n'gamma) 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: gamma-ray energies and intensities; nuclide and level data corresponding to where the gamma-ray originated from; target (sample) experimental-measurement data. Taken together, this information allows for the extraction of the flux-weighted (n,n'gamma) cross sections for a given transition relative to a defined value. Currently, we are using the fast-neutron flux-weighted partial gamma-ray cross section from ENDF/B-VII.1 for the production of the 847-keV transition from the first excited 2+ state to the 0+ ground state in 56Fe, 468 mb. This value also takes into account contributions to the 847-keV transition following beta(-) decay of 56Mn formed in the 56Fe(n,p) reaction. However, this value can easily be adjusted to accommodate the user preference. The (n,n'gamma) data has been compiled into a series of ASCII comma separated value tables and a suitemore » of Python scripts and C modules are provided to build the database. Upon building, the database can then be interacted with directly via the SQLite engine or accessed via the Jupyter Notebook Python-browser interface. Several examples exploiting these utilities are also provided with the complete software package.« less

Authors:
 [1];  [2];  [1]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1372676
Report Number(s):
LBNL-1007259
ir:1007259
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Hurst, Aaron M., Bernstein, Lee A., and Chong, Su-Ann. Compilation of the ``Atlas of Gamma-rays from the Inelastic Scattering of Reactor Fast Neutrons'' (1978DE41) by A.M. Demidov, L.I. Govor, Yu. K. Cherepantsev, M.R. Ahmed, S. Al-Najjar, M.A. Al-Amili, N. Al-Assafi, and N. Rammo. United States: N. p., 2017. Web. doi:10.2172/1372676.
Hurst, Aaron M., Bernstein, Lee A., & Chong, Su-Ann. Compilation of the ``Atlas of Gamma-rays from the Inelastic Scattering of Reactor Fast Neutrons'' (1978DE41) by A.M. Demidov, L.I. Govor, Yu. K. Cherepantsev, M.R. Ahmed, S. Al-Najjar, M.A. Al-Amili, N. Al-Assafi, and N. Rammo. United States. doi:10.2172/1372676.
Hurst, Aaron M., Bernstein, Lee A., and Chong, Su-Ann. Wed . "Compilation of the ``Atlas of Gamma-rays from the Inelastic Scattering of Reactor Fast Neutrons'' (1978DE41) by A.M. Demidov, L.I. Govor, Yu. K. Cherepantsev, M.R. Ahmed, S. Al-Najjar, M.A. Al-Amili, N. Al-Assafi, and N. Rammo". United States. doi:10.2172/1372676. https://www.osti.gov/servlets/purl/1372676.
@article{osti_1372676,
title = {Compilation of the ``Atlas of Gamma-rays from the Inelastic Scattering of Reactor Fast Neutrons'' (1978DE41) by A.M. Demidov, L.I. Govor, Yu. K. Cherepantsev, M.R. Ahmed, S. Al-Najjar, M.A. Al-Amili, N. Al-Assafi, and N. Rammo},
author = {Hurst, Aaron M. and Bernstein, Lee A. and Chong, Su-Ann},
abstractNote = {A Structured Query Language (SQL) relational database has been developed based on the original (n,n'gamma) 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: gamma-ray energies and intensities; nuclide and level data corresponding to where the gamma-ray originated from; target (sample) experimental-measurement data. Taken together, this information allows for the extraction of the flux-weighted (n,n'gamma) cross sections for a given transition relative to a defined value. Currently, we are using the fast-neutron flux-weighted partial gamma-ray cross section from ENDF/B-VII.1 for the production of the 847-keV transition from the first excited 2+ state to the 0+ ground state in 56Fe, 468 mb. This value also takes into account contributions to the 847-keV transition following beta(-) decay of 56Mn formed in the 56Fe(n,p) reaction. However, this value can easily be adjusted to accommodate the user preference. The (n,n'gamma) data has been compiled into a series of ASCII comma separated value tables and a suite of Python scripts and C modules are provided to build the database. Upon building, the database can then be interacted with directly via the SQLite engine or accessed via the Jupyter Notebook Python-browser interface. Several examples exploiting these utilities are also provided with the complete software package.},
doi = {10.2172/1372676},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jul 26 00:00:00 EDT 2017},
month = {Wed Jul 26 00:00:00 EDT 2017}
}

Technical Report:

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  • A Monte Carlo calculation of the gamma rays from neutron inelastic scattering in air is described. The results of these calculations are given in the form of energy and angular distributions of the detected gamma -ray fluxes and angular distributions of the detected gamma -ray dose rates for point monodirectional neutron sources of 6, 8, 10.9, and 14 Mev at source-detector separation distances of 10, 35, 64, and 100 ft. (auth)
  • The cross section for the productlon of 2.61-Mev gamma rays from the Pb/ sup 208/(n,n')Pb/sup 208/ reaction was measured for five different angles from 50 to 130 deg The angular distribution appeared to be isotropic within the precision of the experiments and led to an integrated cross section of 25.5 plus or minus 4.6 mb. (auth)
  • Radioactive material handled in nuclear safeguards often emits both gamma rays and neutrons. The gamma rays emitted by the radioactive isotopes are listed in several compilations, which can be used for identification and quantitative analysis of the radioactive isotopes present. Some of the neutrons are moderated and undergo thermal capture. The capture gamma rays are also listed in several compilations that can be used for analysis. However, some of the unmoderated neutrons undergo fast reactions with both radioactive and nonradioactive target isotopes. The dominant type of reaction is usually (n,n'..gamma..). Data on gamma rays from the interaction of fast neutronsmore » are not extensive, and the available ordered lists give only the most common elements. This report presents a table of these gamma rays in order of increasing energy for 77 elements. The present table is based primarily on data acquired at the Baghdad Nuclear Research Institute and analyzed at the I.V. Kurchatov Institute of Atomic Energy. The intensities were measured at 90/sup 0/ to the neutron beam with a Ge(Li) detector and were corrected for self-absorption in the target. In addition to the (n,n'..gamma..) reaction, the (n,p..gamma..) and (n,..cap alpha gamma..) reactions were observed on some elements with Z < 40. The fast neutron spectrum at E/sub n > 1.5 MeV used for these measurements can be approximated by exp (-0.75 E/sub n/), where E/sub n/ is the neutron energy in MeV. The relative intensities of transitions from levels above 0.5 MeV are not critically dependent on the exponent. The present table includes only the five most intense gamma rays from each element.« less
  • Cross sections for neutron threshold reactions (n,p) with Mg/sup 24/, Al/ sup 27/, Pa/sup 31/, S/sup 32/, Fe/sup 54/, Fe/sup 56/, and Ni/sup 58/ and for the (n, alpha ) reaction with Al/sup 27/ are presented. The cross-section values are printed on several sheets of transparent paper enabling a survey of a given series of measurements separately as well as permitting the intercomparison of different measuring series. Uncertainties of cross section values and neutron energies are indicated. The figures of merit for the reactions are also included. (C.E.S.)