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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

BF - Elementární částice a fyzika vysokých energií

OECD FORD obor

—

Projekt

<a href="/cs/project/LM2011030" target="_blank" >LM2011030: Van de Graaff - urychlovač iontů HV2500 jako laditelný zdroj neutronů v rámci české a evropské velké infrastruktury</a><br>

Návaznosti

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

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název statě ve sborníku

Journal of Instrumentation

ISBN

—

ISSN

1748-0221

e-ISSN

—

Počet stran výsledku

8

Strana od-do

—

Název nakladatele

IOP Publishing Ltd

Místo vydání

Bristol

Místo konání akce

Paris

Datum konání akce

23. 7. 2013

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000385793900027