Journal
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
Volume 51, Issue 6, Pages 3427-3434Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TNS.2004.839134
Keywords
cosmic rays; neutron flux; neutron radiation effects; neutron spectrometer; neutron spectroscopy; neutron spectrum; neutrons; single event upsets (SEUs); soft errors
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New ground-based measurements of the cosmic-ray induced neutron flux and its energy distribution have been made at several locations across the United States using an extended-energy Bonner sphere spectrometer. The data cover over twelve decades of neutron energy, from meV to GeV. An expression to scale the flux to other locations has been developed from a fit to the altitude dependence of our measurements and an expression from the literature for the geomagnetic and solar-activity dependence of neutron monitor rates. In addition, an analytic expression is provided which fits the neutron spectrum above about 0.4 MeV. The neutron flux is important for estimating the soft-error rate in computer memories and recent computer logic devices.
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