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Title: Capture Gamma-Ray Libraries for Nuclear Applications

Abstract

The neutron capture reaction is useful in identifying and analyzing the gamma-ray spectrum from an unknown assembly as it gives unambiguous information on its composition. This can be done passively or actively where an external neutron source is used to probe an unknown assembly. There are known capture gamma-ray data gaps in the ENDF libraries used by transport codes for various nuclear applications. The Evaluated Gamma-ray Activation file (EGAF) is a new thermal neutron capture database of discrete line spectra and cross sections for over 260 isotopes that was developed as part of an IAEA Coordinated Research Project. EGAF has been used to improve the capture gamma production in ENDF libraries. For medium to heavy nuclei the quasi continuum contribution to the gamma cascades is not experimentally resolved. The continuum contains up to 90percent of all the decay energy an is modeled here with the statistical nuclear structure code DICEBOX. This code also provides a consistency check of the level scheme nuclear structure evaluation. The calculated continuum is of sufficient accuracy to include in the ENDF libraries. This analysis also determines new total thermal capture cross sections and provides an improved RIPL database. For higher energy neutron capture there ismore » less experimental data available making benchmarking of the modeling codes more difficult. We use CASINO, a version of DICEBOX that is modified for this purpose. This can be used to simulate the neutron capture at incident neutron energies up to 20 MeV to improve the gamma-ray spectrum in neutron data libraries used for transport modelling of unknown assemblies.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Nuclear Science Division
OSTI Identifier:
1023386
Report Number(s):
LBNL-4678E
TRN: US1104524
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: International Conference on Nuclear Data for Science and Technology, Jeju Island, Korea , April 26-30, 2010
Country of Publication:
United States
Language:
English
Subject:
42; 07; 12; 98; 73; 22; 38; ACCURACY; CAPTURE; CROSS SECTIONS; DECAY; ENERGY LEVELS; EVALUATION; GAMMA CASCADES; HEAVY NUCLEI; IAEA; NEUTRON REACTIONS; NEUTRON SOURCES; NEUTRONS; NUCLEAR STRUCTURE; PROBES; PRODUCTION; SIMULATION; SPECTRA; THERMAL NEUTRONS; TRANSPORT; ND2010, Nuclear Data, ENDF

Citation Formats

Sleaford, B.W., Firestone, Richard B., Summers, N., Escher, J., Hurst, A., Krticka, M., Basunia, S., Molnar, G., Belgya, T., Revay, Z., and Choi, H.D. Capture Gamma-Ray Libraries for Nuclear Applications. United States: N. p., 2010. Web.
Sleaford, B.W., Firestone, Richard B., Summers, N., Escher, J., Hurst, A., Krticka, M., Basunia, S., Molnar, G., Belgya, T., Revay, Z., & Choi, H.D. Capture Gamma-Ray Libraries for Nuclear Applications. United States.
Sleaford, B.W., Firestone, Richard B., Summers, N., Escher, J., Hurst, A., Krticka, M., Basunia, S., Molnar, G., Belgya, T., Revay, Z., and Choi, H.D. Sat . "Capture Gamma-Ray Libraries for Nuclear Applications". United States. doi:. https://www.osti.gov/servlets/purl/1023386.
@article{osti_1023386,
title = {Capture Gamma-Ray Libraries for Nuclear Applications},
author = {Sleaford, B.W. and Firestone, Richard B. and Summers, N. and Escher, J. and Hurst, A. and Krticka, M. and Basunia, S. and Molnar, G. and Belgya, T. and Revay, Z. and Choi, H.D.},
abstractNote = {The neutron capture reaction is useful in identifying and analyzing the gamma-ray spectrum from an unknown assembly as it gives unambiguous information on its composition. This can be done passively or actively where an external neutron source is used to probe an unknown assembly. There are known capture gamma-ray data gaps in the ENDF libraries used by transport codes for various nuclear applications. The Evaluated Gamma-ray Activation file (EGAF) is a new thermal neutron capture database of discrete line spectra and cross sections for over 260 isotopes that was developed as part of an IAEA Coordinated Research Project. EGAF has been used to improve the capture gamma production in ENDF libraries. For medium to heavy nuclei the quasi continuum contribution to the gamma cascades is not experimentally resolved. The continuum contains up to 90percent of all the decay energy an is modeled here with the statistical nuclear structure code DICEBOX. This code also provides a consistency check of the level scheme nuclear structure evaluation. The calculated continuum is of sufficient accuracy to include in the ENDF libraries. This analysis also determines new total thermal capture cross sections and provides an improved RIPL database. For higher energy neutron capture there is less experimental data available making benchmarking of the modeling codes more difficult. We use CASINO, a version of DICEBOX that is modified for this purpose. This can be used to simulate the neutron capture at incident neutron energies up to 20 MeV to improve the gamma-ray spectrum in neutron data libraries used for transport modelling of unknown assemblies.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat May 01 00:00:00 EDT 2010},
month = {Sat May 01 00:00:00 EDT 2010}
}

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