Ground Albedo Neutron Impacts to Seasonal Variations of Cosmic-Ray-Induced Neutron in Medium Geomagnetic Latitude and Antarctica: Impacts on Soft Error Rate

International audience This paper investigates the impact of ground albedo neutrons in the terrestrial radiation field and their seasonal variations. A modeling methodology is proposed, it is based on ATMORAD (atmospheric shower modeling) and GEANT4 simulations taking into account the soil character...

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Bibliographic Details
Published in:IEEE Transactions on Nuclear Science
Main Author: Hubert, G.
Other Authors: ONERA - The French Aerospace Lab Toulouse, ONERA
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2017
Subjects:
COSMIC-RAY INDUCED NEUTRONS
GROUND ALBEDO NEUTRON
SEASONAL VARIATIONS
GEANT4
HIGH-ALTITUDE STATIONS
[PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph]
Antarc*
Antarctica
Online Access:https://hal.archives-ouvertes.fr/hal-01487917
https://hal.archives-ouvertes.fr/hal-01487917/document
https://hal.archives-ouvertes.fr/hal-01487917/file/DESP16085.1489140747_postprint.pdf
https://doi.org/10.1109/TNS.2016.2614540
Description
Summary:International audience This paper investigates the impact of ground albedo neutrons in the terrestrial radiation field and their seasonal variations. A modeling methodology is proposed, it is based on ATMORAD (atmospheric shower modeling) and GEANT4 simulations taking into account the soil characteristics and hydrogen content. This method was validated thanks to neutron measurements performed in two high altitude stations located in medium geomagnetic latitude and Antarctica (Pic-du-Midi and Concordia, respectively). Thus, the chemical rock composition, the density, the water content and the snow pack impacts to neutron spectrum were investigated. Simulated and measured spectra were compared. Analyses show that variations are dominant in the thermal domain (i.e. En <0.5 eV) and lesser degree in epithermal and evaporation domains (i.e. 0.5 eV < En <0.1 MeV and 0.1 MeV < En <20 MeV, respectively). The last part investigates the impact induced by the evaporation neutron contribution to Single Event Rate (more impacted by the ground albedo neutron). Results show that evaporation neutrons contribution to the total SER should be assessed for high-sensitive technologies.

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