<?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>S0035-001X2007000900015</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Nuclear track methodology for the analysis of isotropic components in a plasma focus neutron yield]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera]]></surname>
<given-names><![CDATA[J.J.E]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rangel]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Golzarri]]></surname>
<given-names><![CDATA[J.I]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinosa]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Nucleares ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Física ]]></institution>
<addr-line><![CDATA[México D.F.,]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2007</year>
</pub-date>
<volume>53</volume>
<fpage>61</fpage>
<lpage>64</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2007000900015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2007000900015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2007000900015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The average angular distributions of neutron emissions have been measured in the Fuego Nuevo II (FN-II) dense plasma focus device (5kJ) by means of CR-39 plastic nuclear track detectors. When pure deuterium is used as the filling gas, the data can be adjusted to a Gaussian function, related to anisotropic emission, superposed on a constant pedestal, related to isotropic emission. When deuterium-argon admixtures are used, the anisotropic contribution is best represented by a parabola. The neutron flux at these two angles are used, along with the angular distribution obtained from the track detectors, in order to estimate the absolute neutron yield of both the isotropic and the anisotropic contributions. From examining different groups of shots, it is found that the shape of the angular distribution is important in the estimation of anisotropy, and that the value usually reported, as the ratio of the neutron flux head on and side on, as measured by activation counters, may be misleading.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La distribución angular promedio de la emisión de neutrones ha sido medida en el foco del Dispositivo de Plasma Denso (5kJ) Fuego Nuevo II (FNII) mediante detectores plásticos de Trazas Nucleares (CR-39). Cuando se usa deuterio puro como gas de llenado en el dispositivo, los datos se pueden ajustar a una funcion Gaussiana, relacionando la emisión anisotrópica, superpuesta sobre un pedestal. Cuando se usa una mezcla de deuterio-argón, la contribución anisotrópica está mejor representada por una parábola. Se usó el flujo de neutrones a dos ángulos, a lo largo con la distribución angular obtenida por los detectores de trazas, con objeto de estimar el campo absoluto de neutrones en ambas contribuciones, isotrópica y anisotrópica. Examinando los diferentes grupos de disparos del FNII, se encuentra que la distribución angular es importante en la estimación de la anisotropía, y que el valor usualmente reportado, es una relación de los flujos principales y secundarios de neutrones, como los medidos con contadores por activación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Plasma focus]]></kwd>
<kwd lng="en"><![CDATA[neutrons]]></kwd>
<kwd lng="en"><![CDATA[protons]]></kwd>
<kwd lng="en"><![CDATA[nuclear track detectors]]></kwd>
<kwd lng="es"><![CDATA[Plasma]]></kwd>
<kwd lng="es"><![CDATA[neutrones]]></kwd>
<kwd lng="es"><![CDATA[protones]]></kwd>
<kwd lng="es"><![CDATA[detectores por trazas nucleares]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>Nuclear track methodology for the analysis of isotropic components in a plasma focus neutron yield</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"> <b>F. Castillo&ordf;, J.J.E. Herrera&ordf;, J. Rangel&ordf;, J.I. Golzarri<sup>b</sup> and G. Espinosa<sup>b</sup> </b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>&ordf; Instituto de Ciencias Nucleares, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Apartado Postal 70-543, 04510, M&eacute;xico D.F., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Instituto de F&iacute;sica, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Apartado Postal 20-364, 01000, M&eacute;xico D.F., M&eacute;xico, e-mail: <a href="mailto:espinosa@fisica.unam.mx">espinosa@fisica.unam.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 2 de marzo de 2006    <br> Aceptado el 18 de agosto de 2006</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Abstract </b></font></p>     <p align="justify"><font face="verdana" size="2">The average angular distributions of neutron emissions have been measured in the Fuego Nuevo II (FN-II) dense plasma focus device (5kJ) by means of CR-39 plastic nuclear track detectors. When pure deuterium is used as the filling gas, the data can be adjusted to a Gaussian function, related to anisotropic emission, superposed on a constant pedestal, related to isotropic emission. When deuterium-argon admixtures are used, the anisotropic contribution is best represented by a parabola. The neutron flux at these two angles are used, along with the angular distribution obtained from the track detectors, in order to estimate the absolute neutron yield of both the isotropic and the anisotropic contributions. From examining different groups of shots, it is found that the shape of the angular distribution is important in the estimation of anisotropy, and that the value usually reported, as the ratio of the neutron flux head on and side on, as measured by activation counters, may be misleading.</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Keywords: </b>Plasma focus; neutrons; protons; nuclear track detectors.</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 distribuci&oacute;n angular promedio de la emisi&oacute;n de neutrones ha sido medida en el foco del Dispositivo de Plasma Denso (5kJ) Fuego Nuevo II (FNII) mediante detectores pl&aacute;sticos de Trazas Nucleares (CR-39). Cuando se usa deuterio puro como gas de llenado en el dispositivo, los datos se pueden ajustar a una funcion Gaussiana, relacionando la emisi&oacute;n anisotr&oacute;pica, superpuesta sobre un pedestal. Cuando se usa una mezcla de deuterio-arg&oacute;n, la contribuci&oacute;n anisotr&oacute;pica est&aacute; mejor representada por una par&aacute;bola. Se us&oacute; el flujo de neutrones a dos &aacute;ngulos, a lo largo con la distribuci&oacute;n angular obtenida por los detectores de trazas, con objeto de estimar el campo absoluto de neutrones en ambas contribuciones, isotr&oacute;pica y anisotr&oacute;pica. Examinando los diferentes grupos de disparos del FNII, se encuentra que la distribuci&oacute;n angular es importante en la estimaci&oacute;n de la anisotrop&iacute;a, y que el valor usualmente reportado, es una relaci&oacute;n de los flujos principales y secundarios de neutrones, como los medidos con contadores por activaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Descriptores: </b>Plasma; neutrones; protones; detectores por trazas nucleares.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 52.50.dg;61.80.hg</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v53s3/v53s3a15.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>Acknowledgements</b></font></p>     <p align="justify"><font face="verdana" size="2">This work was partially supported by the DGAPA-UNAM grant IN105100.</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. N.V. Filippov, T.I. Fillippova, and V.N. 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