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Title: Neutron energy spectrum effects in primary damage formation

Abstract

Designers of the National Spallation Neutron Source (NSNS) must make extensive use of radiation effects data obtained from fission reactor irradiations. One uncertainty in using the fission reactor database is the impact of the much higher energy neutrons (up to 1000 MeV) that will be produced in the NSNS, whereas a typical fission reactor spectrum has few neutrons above 2 to 5 MeV. The spallation neutrons will in turn lead to the formation of atomic displacement cascades by higher-energy primary knockon atoms (PKA). Thus, it is important to determine the degree to which differences in PKA energy spectra may influence a materials response to irradiation. This issue has been addressed through the use of displacement cascade simulations using molecular dynamics (MD). The results presented here include energies as high as 50 keV, corresponding to the average cascade energy from a 2.3-MeV neutron.

Authors:
 [1];  [2]
  1. Oak Ridge National Lab., TN (United States)
  2. Pacific Northwest National Lab., Richland, WA (United States)
Publication Date:
OSTI Identifier:
678175
Report Number(s):
CONF-990605-
Journal ID: TANSAO; ISSN 0003-018X; TRN: 99:009160
Resource Type:
Journal Article
Journal Name:
Transactions of the American Nuclear Society
Additional Journal Information:
Journal Volume: 80; Conference: 1999 annual meeting of the American Nuclear Society (ANS), Boston, MA (United States), 6-10 Jun 1999; Other Information: PBD: 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; 07 ISOTOPE AND RADIATION SOURCE TECHNOLOGY; NEUTRON SOURCES; ACCELERATOR FACILITIES; NEUTRON SPECTRA; PHYSICAL RADIATION EFFECTS; MATERIALS; MEV RANGE 01-10; MOLECULAR DYNAMICS METHOD; CRYSTAL DEFECTS

Citation Formats

Stoller, R.E., and Greenwood, L.R. Neutron energy spectrum effects in primary damage formation. United States: N. p., 1999. Web.
Stoller, R.E., & Greenwood, L.R. Neutron energy spectrum effects in primary damage formation. United States.
Stoller, R.E., and Greenwood, L.R. Wed . "Neutron energy spectrum effects in primary damage formation". United States.
@article{osti_678175,
title = {Neutron energy spectrum effects in primary damage formation},
author = {Stoller, R.E. and Greenwood, L.R.},
abstractNote = {Designers of the National Spallation Neutron Source (NSNS) must make extensive use of radiation effects data obtained from fission reactor irradiations. One uncertainty in using the fission reactor database is the impact of the much higher energy neutrons (up to 1000 MeV) that will be produced in the NSNS, whereas a typical fission reactor spectrum has few neutrons above 2 to 5 MeV. The spallation neutrons will in turn lead to the formation of atomic displacement cascades by higher-energy primary knockon atoms (PKA). Thus, it is important to determine the degree to which differences in PKA energy spectra may influence a materials response to irradiation. This issue has been addressed through the use of displacement cascade simulations using molecular dynamics (MD). The results presented here include energies as high as 50 keV, corresponding to the average cascade energy from a 2.3-MeV neutron.},
doi = {},
journal = {Transactions of the American Nuclear Society},
number = ,
volume = 80,
place = {United States},
year = {1999},
month = {9}
}