Semi-insulating GaAs detectors with HDPE layer for detection of fast neutrons from D-T nuclear reaction

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F14%3A00310945" target="_blank" >RIV/68407700:21670/14:00310945 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1142/S2010194516602337" target="_blank" >http://dx.doi.org/10.1142/S2010194516602337</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1142/S2010194516602337" target="_blank" >10.1142/S2010194516602337</a>

Result language

angličtina

Original language name

Semi-insulating GaAs detectors with HDPE layer for detection of fast neutrons from D-T nuclear reaction

Original language description

Bulk semi-insulating (SI) GaAs detectors optimized for fast-neutron detection were examined using mono-energetic neutrons. The detectors have an active area of 7.36 mm(2) defined by a multipixel structure of a AuZn Schottky contact allowing a relatively high breakdown voltage (300 V) sufficient for full depletion of the detector structure. The Schottky contact is covered by a HDPE (high density polyethylene) conversion layer, where neutrons transfer their kinetic energy to hydrogen atoms through elastic nuclear collisions. The detectors were exposed to mono-energetic neutrons generated by a deuterium (D)-tritium (T) nuclear reaction at a Van de Graaff accelerator. Neutrons reached a kinetic energy of 16.8 MeV when deuterons were accelerated by 1 MV potential. The influence of the HDPE layer thickness on the detection efficiency of the fast neutrons was studied. The thickness of the conversion layer varied from 50 mu m to 1300 mu m. The increase of the HDPE layer thickness led to a higher detection efficiency due to higher conversion efficiency of the HDPE layer. The effect of the active detector thickness modified by the detector reverse bias voltage on the detection efficiency was also evaluated. By increasing the detector reverse voltage, the detector active volume expands to the depth and also to the sides, slightly increasing the neutron detection efficiency.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

BF - Elementary particle theory and high energy physics

OECD FORD branch

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Project

<a href="/en/project/LM2011030" target="_blank" >LM2011030: Van de Graaff - accelerator of ions HV2500 as tuneable neutron source in frame of Czech and European Large Infrastructure</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2014

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Journal of Instrumentation

ISBN

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ISSN

1748-0221

e-ISSN

—

Number of pages

8

Pages from-to

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Publisher name

IOP Publishing Ltd

Place of publication

Bristol

Event location

Paris

Event date

Jul 23, 2013

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000385793900027