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Title: Photocurrent from Single Collision 14 MeV Neutrons in GaN and GaAs

Abstract

Accurate predictions of device performance in 14 MeV neutron environments relies upon understanding the recoil cascades that may be produced. Recoils from 14 MeV neutrons impinging on both gallium nitride (GaN) and gallium arsenide (GaAs) devices were modeled and compared to the recoil spectra of devices exposed to 14 MeV neutrons. Recoil spectra were generated using nuclear reaction modeling programs and converted into an ionizing energy loss (IEL) spectrum. We measured the recoil IEL spectra by capturing the photocurrent pulses produced by single neutron interactions with the device. Good agreement, with a factor of two, was found between the model and experiment under strongly-depleted conditions. However, this range of agreement between model and experiment decreased significantly when the bias was removed, indicating partial energy deposition due to cascades that escape the active volume of the device not captured by the model. Consistent event rates across multiple detectors confirm the reliability of our neutron recoil detection method.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Security (NA-70)
OSTI Identifier:
1574699
Report Number(s):
SAND-2019-11380J
Journal ID: ISSN 0018-9499; 679523
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Nuclear Science
Additional Journal Information:
Journal Name: IEEE Transactions on Nuclear Science; Journal ID: ISSN 0018-9499
Publisher:
IEEE
Country of Publication:
United States
Language:
English

Citation Formats

Jasica, Matthew J., Wampler, William R., Vizkelethy, Gyorgy, Hehr, Brian D., and Bielejec, Edward S. Photocurrent from Single Collision 14 MeV Neutrons in GaN and GaAs. United States: N. p., 2019. Web. doi:10.1109/TNS.2019.2949720.
Jasica, Matthew J., Wampler, William R., Vizkelethy, Gyorgy, Hehr, Brian D., & Bielejec, Edward S. Photocurrent from Single Collision 14 MeV Neutrons in GaN and GaAs. United States. doi:10.1109/TNS.2019.2949720.
Jasica, Matthew J., Wampler, William R., Vizkelethy, Gyorgy, Hehr, Brian D., and Bielejec, Edward S. Tue . "Photocurrent from Single Collision 14 MeV Neutrons in GaN and GaAs". United States. doi:10.1109/TNS.2019.2949720.
@article{osti_1574699,
title = {Photocurrent from Single Collision 14 MeV Neutrons in GaN and GaAs},
author = {Jasica, Matthew J. and Wampler, William R. and Vizkelethy, Gyorgy and Hehr, Brian D. and Bielejec, Edward S.},
abstractNote = {Accurate predictions of device performance in 14 MeV neutron environments relies upon understanding the recoil cascades that may be produced. Recoils from 14 MeV neutrons impinging on both gallium nitride (GaN) and gallium arsenide (GaAs) devices were modeled and compared to the recoil spectra of devices exposed to 14 MeV neutrons. Recoil spectra were generated using nuclear reaction modeling programs and converted into an ionizing energy loss (IEL) spectrum. We measured the recoil IEL spectra by capturing the photocurrent pulses produced by single neutron interactions with the device. Good agreement, with a factor of two, was found between the model and experiment under strongly-depleted conditions. However, this range of agreement between model and experiment decreased significantly when the bias was removed, indicating partial energy deposition due to cascades that escape the active volume of the device not captured by the model. Consistent event rates across multiple detectors confirm the reliability of our neutron recoil detection method.},
doi = {10.1109/TNS.2019.2949720},
journal = {IEEE Transactions on Nuclear Science},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
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This content will become publicly available on November 5, 2020
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