<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0864-084X</journal-id>
<journal-title><![CDATA[Nucleus]]></journal-title>
<abbrev-journal-title><![CDATA[Nucleus]]></abbrev-journal-title>
<issn>0864-084X</issn>
<publisher>
<publisher-name><![CDATA[CUBAENERGIA]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-084X2018000200030</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Study of charge sharing effect and energy resolution of the Timepix hybrid detector based on gallium arsenide compensated with chromium]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudio del efecto de compartición de cargas y la resolución energética del detector híbrido Timepix de arseniuro de galio compensado con cromo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrera Gonzalez]]></surname>
<given-names><![CDATA[Lisan David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leyva Fabelo]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Smolyanskiy]]></surname>
<given-names><![CDATA[Petr]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zhemchugov]]></surname>
<given-names><![CDATA[Alexey]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alfonso Pita]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meneses González]]></surname>
<given-names><![CDATA[Annie]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Pinar del Rio (UPR)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Center for Technological Applications and Nuclear Development (CEADEN)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Joint Institute for Nuclear Research (JINR)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Rusia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Higher Institute of Technology and Applied Sciences (InsTEC)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<numero>64</numero>
<fpage>30</fpage>
<lpage>36</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-084X2018000200030&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-084X2018000200030&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-084X2018000200030&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Among the latest ionizing radiation detectors, those based on chromium compensated gallium arsenide (GaAs:Cr) are ones of the most competitive for many applications due to their high Z and strong resistance to radiation damage. They have been used in high energy physics research, medical visualization and spatial technologies, geological prospecting, among other advanced fields. The object of this work is a 900 µm GaAs:Cr detector with Timepix readout technology. Some detector characteristics for three experimental conditions were measured and studied by using the X-rays from a synchrotron and an X-ray tube provided with different materials for obtaining the corresponding fluorescence photons. A complex function was used to decompose the differential spectra into the most important contributions involved. As an additional tool for the research, the mathematical modeling of the mobility of charge carriers generated by radiation within the active volume of the detector was used. The results of these charge sharing effect studies showed a noticeable prevalence in the detector of this effect, changing its contribution according to the experiment characteristics. The detector was calibrated for the planned experiments and the energy resolution was determined. From the analysis of all the obtained results and their comparison with those reported in literature, it was confirmed that the detector has a marked charge-sharing effect between neighboring pixels, being its performance more impaired as the energy of incident photons increases.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Entre los últimos detectores de radiación ionizante, los basados &#8203;&#8203;en arseniuro de galio compensado con cromo (GaAs: Cr) son de los más competitivos para muchas aplicaciones debido a su alto Z y fuerte resistencia al daño de la radiación. Se han utilizado en investigación de física de alta energía, visualización médica y tecnologías espaciales, prospección geológica, entre otros campos avanzados. El objeto de este trabajo es un detector de GaAs: Cr de 900 µm con tecnología de lectura Timepix. Algunas características del detector para tres condiciones experimentales se midieron y estudiaron utilizando rayos X de un sincrotrón y un tubo de rayos X provisto de diferentes materiales para obtener los fotones de fluorescencia correspondientes. Se utilizó una función compleja para descomponer los espectros diferenciales en las contribuciones más importantes involucradas. Como herramienta adicional para la investigación, se utilizó el modelado matemático de la movilidad de los portadores de carga generados por la radiación dentro del volumen activo del detector. Los resultados de estos estudios de efecto de carga compartida mostraron una prevalencia notable en el detector de este efecto, cambiando su contribución según las características del experimento. El detector se calibró para los experimentos planificados y se determinó la resolución de energía. A partir del análisis de todos los resultados obtenidos y su comparación con los reportados en la literatura, se confirmó que el detector tiene un marcado efecto de reparto de carga entre píxeles vecinos, y su rendimiento se ve más afectado a medida que aumenta la energía de los fotones incidentes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[energy resolution]]></kwd>
<kwd lng="en"><![CDATA[experimental data]]></kwd>
<kwd lng="en"><![CDATA[calibration]]></kwd>
<kwd lng="en"><![CDATA[energy spectra]]></kwd>
<kwd lng="en"><![CDATA[radiation detectors]]></kwd>
<kwd lng="en"><![CDATA[high energy physics]]></kwd>
<kwd lng="en"><![CDATA[charge distribution]]></kwd>
<kwd lng="es"><![CDATA[resolución en energía]]></kwd>
<kwd lng="es"><![CDATA[datos experimentales]]></kwd>
<kwd lng="es"><![CDATA[calibración]]></kwd>
<kwd lng="es"><![CDATA[espectros de energía]]></kwd>
<kwd lng="es"><![CDATA[detectores de radiaciones]]></kwd>
<kwd lng="es"><![CDATA[física de altas energías]]></kwd>
<kwd lng="es"><![CDATA[distribución de cargas]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>[1]</label><nlm-citation citation-type="">
<collab>MEDIPIX</collab>
<source><![CDATA[]]></source>
<year>2011</year>
</nlm-citation>
</ref>
<ref id="B2">
<label>[2]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[POTRAP]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[KOZHEVNIKOV]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
</person-group>
<source><![CDATA[Spectral microtomography using the MARS-CT]]></source>
<year>2013</year>
</nlm-citation>
</ref>
<ref id="B3">
<label>[3]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[KNOLL]]></surname>
<given-names><![CDATA[GF]]></given-names>
</name>
</person-group>
<source><![CDATA[Radiation detection and measurement]]></source>
<year>2000</year>
<edition>Third</edition>
<publisher-loc><![CDATA[Michigan ]]></publisher-loc>
<publisher-name><![CDATA[John Wiley &amp; Sons, Inc.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<label>[4]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[BRIESMEISTER]]></surname>
<given-names><![CDATA[JF]]></given-names>
</name>
</person-group>
<source><![CDATA[MCNP - a general Monte Carlo n-particle transport code]]></source>
<year>2000</year>
<publisher-loc><![CDATA[Los Ángeles ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B5">
<label>[5]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[MENESES]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[Estudio mediante el método de Monte Carlo del transporte de fotones y del proceso de colección de cargas en detectores híbridos pixelados de GaAs:Cr]]></source>
<year>2015</year>
<publisher-loc><![CDATA[Havana ]]></publisher-loc>
<publisher-name><![CDATA[Higher Institute of Technology and Applied Sciences]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<label>[6]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[MENESES]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[LEYVA]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[PINEIRA]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[CRUZ]]></surname>
<given-names><![CDATA[CM]]></given-names>
</name>
</person-group>
<source><![CDATA[Spatial distribution of X and gamma rays induced energy deposition on semi-insulating GaAs:Cr based pixel radiation detector]]></source>
<year>2015</year>
<volume>654</volume>
<page-range>208-12</page-range><publisher-name><![CDATA[Proceedings of X Workshop on Nuclear Physics and IX International Symposium on Nuclear and Related Techniques]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<label>[7]</label><nlm-citation citation-type="">
<collab>NIST</collab>
<source><![CDATA[]]></source>
<year>2015</year>
</nlm-citation>
</ref>
<ref id="B8">
<label>[8]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[SELLIER]]></surname>
<given-names><![CDATA[JMD]]></given-names>
</name>
<name>
<surname><![CDATA[FONSECA]]></surname>
<given-names><![CDATA[JE]]></given-names>
</name>
<name>
<surname><![CDATA[KLIMECK]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<source><![CDATA[Archimedes, the free Monte Carlo simulator]]></source>
<year></year>
<publisher-name><![CDATA[Proceedings of the 15th International Workshop on Computational Electronics]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<label>[9]</label><nlm-citation citation-type="">
<collab>BUDKER INSTITUTE OF NUCLEAR PHYSICS</collab>
<source><![CDATA[The VEPP-3 electron-positron storage ring]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B10">
<label>[10]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[VAN DER BOOG]]></surname>
<given-names><![CDATA[RPM]]></given-names>
</name>
</person-group>
<source><![CDATA[Energy calibration procedure of a pixel detector]]></source>
<year>2013</year>
<publisher-name><![CDATA[National Institute for Subatomic Physics]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<label>[11]</label><nlm-citation citation-type="">
<collab>NIST</collab>
<source><![CDATA[Digital library of mathematical functions]]></source>
<year>2015</year>
</nlm-citation>
</ref>
<ref id="B12">
<label>[12]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[WEISSTEIN]]></surname>
<given-names><![CDATA[EW]]></given-names>
</name>
</person-group>
<source><![CDATA[Erfc]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B13">
<label>[13]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[ARFAOUI]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<source><![CDATA[Calibration, simulation and test-beam characterization of Timepix hybrid-pixel readout assemblies with ultra-thin sensors]]></source>
<year>2013</year>
<publisher-name><![CDATA[International Workshop on Future Linear Collider. The University of Tokyo]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<label>[14]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[MCCONNELL]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[MACRI]]></surname>
<given-names><![CDATA[JR]]></given-names>
</name>
<name>
<surname><![CDATA[RYAN]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
</person-group>
<source><![CDATA[Three-dimensional imaging performance of orthogonal coplanar CZT strip detector]]></source>
<year>2000</year>
<publisher-loc><![CDATA[San Diego ]]></publisher-loc>
<publisher-name><![CDATA[SPIE's 45-th Annual Meeting]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<label>[15]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[BOLOTNIKOV]]></surname>
<given-names><![CDATA[AE]]></given-names>
</name>
<name>
<surname><![CDATA[COOK]]></surname>
<given-names><![CDATA[WR]]></given-names>
</name>
<name>
<surname><![CDATA[HARRISON]]></surname>
<given-names><![CDATA[FA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Charge loss between contacts of CdZnTe pixel detectors]]></article-title>
<source><![CDATA[NIM A]]></source>
<year>1999</year>
<volume>432</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>326-31</page-range></nlm-citation>
</ref>
<ref id="B16">
<label>[16]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[BRÖNNIMANN]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[FLORIN]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[LINDNER]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Synchrotron beam test with a photon-counting pixel detector]]></article-title>
<source><![CDATA[J. Synchrotron Rad]]></source>
<year>2000</year>
<volume>429</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>301-6</page-range></nlm-citation>
</ref>
<ref id="B17">
<label>[17]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[BUTLER]]></surname>
<given-names><![CDATA[AP]]></given-names>
</name>
<name>
<surname><![CDATA[BUTLER]]></surname>
<given-names><![CDATA[PH]]></given-names>
</name>
<name>
<surname><![CDATA[BELL]]></surname>
<given-names><![CDATA[ST]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Measurement of the energy resolution and calibration of hybrid pixel detectors with GaAs:Cr sensor and Timepix readout chip]]></article-title>
<source><![CDATA[NIM A]]></source>
<year>2015</year>
<volume>457</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>234-56</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
