<?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>S0035-001X2007000400012</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Contribución del momento magnético a la fuerza de reacción a la radiación en forma relativista]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ares de Parga]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-Domínguez]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mares]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Física y Matemáticas Dpto de Física]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2007</year>
</pub-date>
<volume>53</volume>
<numero>4</numero>
<fpage>314</fpage>
<lpage>317</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2007000400012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2007000400012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2007000400012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[A partir de la fuerza de reacción a la radiación de origen magnético de Smirnov, se obtiene una ecuación relativista que describe el movimiento de una partícula cargada con momento magnético constante de espín <img border=0 src="../../../../../img/revistas/rmf/v53n4/a12s1.jpg">. Se deduce otra ecuación tipo Landau-Lifshitz que incluye el momento magnético. Se encuentra una diferencia fundamental entre la propuesta de energía radiada clásica y la relativista]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Starting with the magnetic Smirnov reaction force, a relativistic equation which describes the motion of a charged particle with constant magnetic moment of spin <img border=0 src="../../../../../img/revistas/rmf/v53n4/a12s1.jpg">, is obtained. A Landau-Lifshitz-like equation is deduced with magnetic moment. A fundamental difference between the classical and relativistic radiation rate of energy is found.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fuerza de reacción a la radiación]]></kwd>
<kwd lng="es"><![CDATA[momento magnético]]></kwd>
<kwd lng="es"><![CDATA[partícula cargada]]></kwd>
<kwd lng="en"><![CDATA[Reaction radiation force]]></kwd>
<kwd lng="en"><![CDATA[magnetic moment]]></kwd>
<kwd lng="en"><![CDATA[charged particle]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4"><b>Investigaci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Contribuci&oacute;n del momento magn&eacute;tico a la fuerza de reacci&oacute;n a la radiaci&oacute;n en forma relativista</b></font> </p>     <p align="center">&nbsp;  </p>     <p align="center"><font face="verdana" size="2"><b>G. Ares de Parga, M. Ortiz&#150;Dom&iacute;nguez y R. Mares</b></font> </p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Dpto de F&iacute;sica, Escuela    Superior de F&iacute;sica y Matem&aacute;ticas, Instituto Polit&eacute;cnico    Nacional, U.P. Adolfo L&oacute;pez Mateos, Zacatenco, 07738, M&eacute;xico D.F,    M&eacute;xico, e&#150;mail: <a href="mailto:gonzalo@esfm.ipn.mx" target="_blank">gonzalo@esfm.ipn.mx</a></i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 29 de mayo de 2007    <br>   Aceptado el 28 de junio de 2007</font></p>     ]]></body>
<body><![CDATA[<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">A partir de la fuerza de reacci&oacute;n a la radiaci&oacute;n de origen magn&eacute;tico de Smirnov, se obtiene una ecuaci&oacute;n relativista que describe el movimiento de una part&iacute;cula cargada con momento magn&eacute;tico constante de esp&iacute;n <i><img src="/img/revistas/rmf/v53n4/a12s1.jpg">. </i>Se deduce otra ecuaci&oacute;n tipo Landau&#150;Lifshitz que incluye el momento magn&eacute;tico. Se encuentra una diferencia fundamental entre la propuesta de energ&iacute;a radiada cl&aacute;sica y la relativista.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Fuerza de reacci&oacute;n a la radiaci&oacute;n; momento magn&eacute;tico; part&iacute;cula cargada.</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">Starting with the magnetic Smirnov reaction force, a relativistic equation which describes the motion of a charged particle with constant magnetic moment of spin <i><img src="/img/revistas/rmf/v53n4/a12s1.jpg">, </i>is obtained. A Landau&#150;Lifshitz&#150;like equation is deduced with magnetic moment. A fundamental difference between the classical and relativistic radiation rate of energy is found.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Reaction radiation force; magnetic moment; charged particle. </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 03.30.+p; 03.50.&#150;z; 03.50. De; 11.10.&#150;z</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v53n4/v53n4a12.pdf">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>Acknowledgement</b></font></p>     <p align="justify"><font face="verdana" size="2">Este trabajo ha sido parcialmente    patrocinado por COFAA, EDIYEDD (IPN).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. G.F. Efremov y A.Y. Smirnov, <i>Sov. 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