<?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>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2012000300014</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Measurement of L X-ray production cross sections by impact of protons with energies between 2.5 MeV and 5.0 MeV in selected lanthanoids]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miranda]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murillo]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Monroy]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aspiazu]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villaseñor]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Investigaciones Nucleares Departamento de Aceleradores ]]></institution>
<addr-line><![CDATA[Ocoyoacac Edo. Méx.]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Física ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<volume>58</volume>
<numero>3</numero>
<fpage>238</fpage>
<lpage>240</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2012000300014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2012000300014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2012000300014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Accurate quantitative analysis with particle induced X-ray emission (PIXE) requires an accurate knowledge of the X-ray production cross sections, in particular the L lines. While there are a lot of experimental results, recent reviews have found a disagreement between several previously published papers and also by the use of different atomic parameters databases (fluorescence yields and Coster-Kronig transition probabilities). Therefore, it is very convenient to redo some of these cross sections measurements and to extend to other proton energy ranges. Thus, this paper presents results with lanthanoid elements (Ce, Nd, Sm, Eu, Gd, Dy, Ho) irradiated with protons in the energy range 2.5 MeV to 5.0 MeV. The results are compared also with predictions of the ECPSSR theory with the United Atom modification and experimental data of other authors.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La realización de análisis cuantitativos exactos con la emisión de rayos X inducida por partículas (PIXE) requiere del conocimiento de las secciones eficaces de producción de rayos X, en particular de las líneas L. A pesar de que existe una gran cantidad de resultados experimentales, en revisiones recientes se ha encontrado un desacuerdo entre diversos trabajos y la utilización de diferentes bases de datos de parámetros atómicos (producciones de fluorescencia y probabilidades Coster-Kronig), por lo cual se considera conveniente rehacer algunas de las mediciones de estas secciones y extender los intervalos de energías de los protones. Así pues, en este trabajo se presentan resultados obtenidos al irradiar elementos lantanoides (Ce, Nd, Sm, Eu, Gd, Dy, Ho) con protones en el intervalo de energías 2.5 MeV a 5.0 MeV. Se comparan, además, con predicciones de la teoría ECPSSR con modificación de átomo unido y los datos experimentales de otros autores.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[X-ray production cross sections]]></kwd>
<kwd lng="en"><![CDATA[protons]]></kwd>
<kwd lng="en"><![CDATA[ECPSSR]]></kwd>
<kwd lng="en"><![CDATA[ECPSSR-UA]]></kwd>
<kwd lng="es"><![CDATA[Producción de rayos X]]></kwd>
<kwd lng="es"><![CDATA[protones]]></kwd>
<kwd lng="es"><![CDATA[ECPSSR]]></kwd>
<kwd lng="es"><![CDATA[ECPSSR-UA]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">F&iacute;sica de la radiaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Measurement of L X&#45;ray production cross sections by impact of protons with energies between 2.5 MeV and 5.0 MeV in selected lanthanoids</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>J. Miranda<sup>1,2,*</sup>, G. Murillo<sup>1</sup>, B. M&eacute;ndez<sup>1</sup>, J. L&oacute;pez&#45;Monroy<sup>1</sup>, J. Aspiazu<sup>1</sup> and  P. Villase&ntilde;or<sup>1</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1 </sup>Departamento de Aceleradores, Instituto Nacional de Investigaciones Nucleares, Carr. M&eacute;xico&#45;Toluca S/N, Ocoyoacac, Edo. M&eacute;x., 52750.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2 </sup>Instituto de F&iacute;sica, UNAM, A.P. 20&#45;364, M&eacute;xico, D.F. 01000.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 3 de junio de 2011;    ]]></body>
<body><![CDATA[<br> aceptado el 24 de enero de 2012</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">Accurate quantitative analysis with particle induced X&#45;ray emission (PIXE) requires an accurate knowledge of the X&#45;ray production cross sections, in particular the L lines. While there are a lot of experimental results, recent reviews have found a disagreement between several previously published papers and also by the use of different atomic parameters databases (fluorescence yields and Coster&#45;Kronig transition probabilities). Therefore, it is very convenient to redo some of these cross sections measurements and to extend to other proton energy ranges. Thus, this paper presents results with lanthanoid elements (Ce, Nd, Sm, Eu, Gd, Dy, Ho) irradiated with protons in the energy range 2.5 MeV to 5.0 MeV. The results are compared also with predictions of the ECPSSR theory with the United Atom modification and experimental data of other authors.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> X&#45;ray production cross sections; protons; ECPSSR; ECPSSR&#45;UA.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">La realizaci&oacute;n de an&aacute;lisis cuantitativos exactos con la emisi&oacute;n de rayos X inducida por part&iacute;culas (PIXE) requiere del conocimiento de las secciones eficaces de producci&oacute;n de rayos X, en particular de las l&iacute;neas L. A pesar de que existe una gran cantidad de resultados experimentales, en revisiones recientes se ha encontrado un desacuerdo entre diversos trabajos y la utilizaci&oacute;n de diferentes bases de datos de par&aacute;metros at&oacute;micos (producciones de fluorescencia y probabilidades Coster&#45;Kronig), por lo cual se considera conveniente rehacer algunas de las mediciones de estas secciones y extender los intervalos de energ&iacute;as de los protones. As&iacute; pues, en este trabajo se presentan resultados obtenidos al irradiar elementos lantanoides (Ce, Nd, Sm, Eu, Gd, Dy, Ho) con protones en el intervalo de energ&iacute;as 2.5 MeV a 5.0 MeV. Se comparan, adem&aacute;s, con predicciones de la teor&iacute;a ECPSSR con modificaci&oacute;n de &aacute;tomo unido y los datos experimentales de otros autores.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Producci&oacute;n de rayos X; protones; ECPSSR; ECPSSR&#45;UA.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 32.80.Hd; 33.50.Hv; 34.50.Dy.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v58n3/v58n3a14.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">The authors wish to thank the Autonomous University of Puebla for the financial support under project OSA&#45;EXC11&#45;G.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. S.A.E. Johansson and J.L. Campbell. PIXE: A Novel Technique for Elemental Analysis (John Wiley, Chichester, 1988).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8378021&pid=S0035-001X201200030001400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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