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Author: Martha S. Clowdsley Publisher: ISBN: Category : Neutron cross sections Languages : en Pages : 44
Book Description
In addition, a high-energy bidirectional neutron source based on a formula by Ranft showed even further improvement of the fluence results over previous results near the front of the water target where diffusion out the front surface is important. Effects of improved interaction cross sections are modest compared with the addition of the high-energy bidirectional source terms.
Author: Martha S. Clowdsley Publisher: ISBN: Category : Neutron cross sections Languages : en Pages : 44
Book Description
In addition, a high-energy bidirectional neutron source based on a formula by Ranft showed even further improvement of the fluence results over previous results near the front of the water target where diffusion out the front surface is important. Effects of improved interaction cross sections are modest compared with the addition of the high-energy bidirectional source terms.
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781726204132 Category : Languages : en Pages : 36
Book Description
A low-energy neutron transport algorithm for use in space radiation protection is developed. The algorithm is based upon a multigroup analysis of the straight-ahead Boltzmann equation by using a mean value theorem for integrals. This analysis is accomplished by solving a realistic but simplified neutron transport test problem. The test problem is analyzed by using numerical and analytical procedures to obtain an accurate solution within specified error bounds. Results from the test problem are then used for determining mean values associated with rescattering terms that are associated with a multigroup solution of the straight-ahead Boltzmann equation. The algorithm is then coupled to the Langley HZETRN code through the evaporation source term. Evaluation of the neutron fluence generated by the solar particle event of February 23, 1956, for a water and an aluminum-water shield-target configuration is then compared with LAHET and MCNPX Monte Carlo code calculations for the same shield-target configuration. The algorithm developed showed a great improvement in results over the unmodified HZETRN solution. In addition, a two-directional solution of the evaporation source showed even further improvement of the fluence near the front of the water target where diffusion from the front surface is important.Heinbockel, John H. and Clowdsley, Martha S. and Wilson, John W.Langley Research CenterNEUTRONS; ALGORITHMS; RADIATION PROTECTION; MATHEMATICAL MODELS; APPLICATIONS PROGRAMS (COMPUTERS); EXTRATERRESTRIAL RADIATION; BOLTZMANN TRANSPORT EQUATION; FLUENCE; WATER; MONTE CARLO METHOD; ENERGY SPECTRA; SOLAR FLARES...
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781726203876 Category : Languages : en Pages : 42
Book Description
A neutron transport algorithm including both elastic and nonelastic particle interaction processes for use in space radiation protection for arbitrary shield material is developed. The algorithm is based upon a multiple energy grouping and analysis of the straight-ahead Boltzmann equation by using a mean value theorem for integrals. The algorithm is then coupled to the Langley HZETRN code through a bidirectional neutron evaporation source term. Evaluation of the neutron fluence generated by the solar particle event of February 23, 1956, for an aluminum water shield-target configuration is then compared with MCNPX and LAHET Monte Carlo calculations for the same shield-target configuration. With the Monte Carlo calculation as a benchmark, the algorithm developed in this paper showed a great improvement in results over the unmodified HZETRN solution. In addition, a high-energy bidirectional neutron source based on a formula by Ranft showed even further improvement of the fluence results over previous results near the front of the water target where diffusion out the front surface is important. Effects of improved interaction cross sections are modest compared with the addition of the high-energy bidirectional source terms.Clowdsley, Martha S. and Wilson, John W. and Heinbockel, John H. and Tripathi, R. K. and Singleterry, Robert C., Jr. and Shinn, Judy L.Langley Research CenterNEUTRON SOURCES; ALGORITHMS; PARTICLE INTERACTIONS; SHIELDING; BOLTZMANN TRANSPORT EQUATION; RADIATION PROTECTION; EXTRATERRESTRIAL RADIATION; ELASTIC PROPERTIES; WATER; THEOREMS; TARGETS; SOLAR STORMS; SOLAR FLARES; SOLAR CORPUSCULAR RADIATION; RADIATION TRANSPORT; MONTE CARLO METHOD...
Author: Dan Gabriel Cacuci Publisher: Springer Science & Business Media ISBN: 0387981306 Category : Science Languages : en Pages : 3701
Book Description
This is an authoritative compilation of information regarding methods and data used in all phases of nuclear engineering. Addressing nuclear engineers and scientists at all levels, this book provides a condensed reference on nuclear engineering since 1958.
Author: Publisher: ScholarlyEditions ISBN: 1464966680 Category : Technology & Engineering Languages : en Pages : 592
Book Description
Issues in Aerospace and Defense Research and Application: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Aerospace and Defense Research and Application. The editors have built Issues in Aerospace and Defense Research and Application: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Aerospace and Defense Research and Application in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Aerospace and Defense Research and Application: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Author: Martha S. Clowdsley
Author: Martha S. Clowdsley
Author: National Aeronautics and Space Administration (NASA)
Author: John H. Heinbockel
Author: National Aeronautics and Space Administration (NASA)
Author: Dan Gabriel Cacuci
Author: 
Author: M. Alexander
Author: 
Author: United States. National Aeronautics and Space Administration
Author: