<?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>S0035-001X2007000900018</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Use of the associated particle technique for the measurement of neutron cross sections at small angles]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Policroniades]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Varela]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</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[Moreno]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortíz]]></surname>
<given-names><![CDATA[Ma. Ester]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Huerta]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Investigaciones Nucleares Depto. del Acelerador ]]></institution>
<addr-line><![CDATA[ Edo. de México]]></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>74</fpage>
<lpage>77</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2007000900018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2007000900018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2007000900018&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Even when much nuclear data has been generated during the last 50 years, the need and demand for scattering information of fast neutrons is still a present matter for basic science and technology. Attending its application, it is relevant to observe that, in general, the data is scarce for small angle scattering of (MeV) neutrons for elements of technological importance such as V, Ti, Fe, Cu, Zr, etc. With this in mind, we have contemplated the measurement of neutron scattering cross sections, at angles &lt; 40 degrees for some of these elements, using the associated particle technique, and for which a versatile (thin wall) vacuum scattering chamber is to be constructed. Some preliminary results concerning the scattering of 2.2 MeV neutrons by natural Pb, using the D(d,n)3He reaction as a source, are presented.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Aun cuando durante los últimos 50 años se ha producido mucha información nuclear, la demanda y la necesidad de información de dispersión de neutrones rápidos sigue presente para la ciencia básica, como para la tecnología. En atención a sus aplicaciones, es de relevancia observar, en general, la escasez de datos experimentales -a pequeños ángulos- de muchos elementos de interés tecnológico, como V, Ti, Fe, Cu, Zr, etc. Atendiendo esta aplicación, hemos contemplado la medida de secciones de dispersión de neutrones a ángulos < 40° para algunos de estos elementos, usando la tecnica de la partícula asociada, y también para lo cual se plantea la construcción una nueva cámara de dispersión al vacío (con ventana delgada). Se presentan, sobre todo, algunos resultados (preliminares) de la dispersión de neutrones de 2.2 MeV sobre plomo natural, usando la reacción D(d,n)3He como fuente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Neutron cross sections]]></kwd>
<kwd lng="en"><![CDATA[associated particle technique]]></kwd>
<kwd lng="es"><![CDATA[Secciones transversales para neutrones]]></kwd>
<kwd lng="es"><![CDATA[técnica de la partícula asociada]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>Use of the associated particle technique for the measurement of neutron cross sections at small angles</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>R. Policroniades&ordf;, A. Varela&ordf;, G. Murillo&ordf;, E. Moreno&ordf;, E. Ch&aacute;vez<sup>b</sup>. Ma. Ester Ort&iacute;z<sup>b</sup> and A. Huerta<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; Depto. del Acelerador, Instituto Nacional de Investigaciones Nucleares (ININ), Carr. M&eacute;xico </i>- <i>Toluca S/N, La Marquesa, Ocoyoacac, Edo. de M&eacute;xico, 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 (IFUNAM), Ciudad Universitaria, M&eacute;xico, D.F., M&eacute;xico.</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">Even when much nuclear data has been generated during the last 50 years, the need and demand for scattering information of fast neutrons is still a present matter for basic science and technology. Attending its application, it is relevant to observe that, in general, the data is scarce for small angle scattering of (MeV) neutrons for elements of technological importance such as V, Ti, Fe, Cu, Zr, etc. With this in mind, we have contemplated the measurement of neutron scattering cross sections, at angles &lt; 40 degrees for some of these elements, using the associated particle technique, and for which a versatile (thin wall) vacuum scattering chamber is to be constructed. Some preliminary results concerning the scattering of 2.2 MeV neutrons by natural Pb, using the D(d,n)3He reaction as a source, are presented.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Neutron cross sections; associated particle technique.</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">Aun cuando durante los &uacute;ltimos 50 a&ntilde;os se ha producido mucha informaci&oacute;n nuclear, la demanda y la necesidad de informaci&oacute;n de dispersi&oacute;n de neutrones r&aacute;pidos sigue presente para la ciencia b&aacute;sica, como para la tecnolog&iacute;a. En atenci&oacute;n a sus aplicaciones, es de relevancia observar, en general, la escasez de datos experimentales -a peque&ntilde;os &aacute;ngulos- de muchos elementos de inter&eacute;s tecnol&oacute;gico, como V, Ti, Fe, Cu, Zr, etc. Atendiendo esta aplicaci&oacute;n, hemos contemplado la medida de secciones de dispersi&oacute;n de neutrones a &aacute;ngulos &lt; 40&deg; para algunos de estos elementos, usando la tecnica de la part&iacute;cula asociada, y tambi&eacute;n para lo cual se plantea la construcci&oacute;n una nueva c&aacute;mara de dispersi&oacute;n al vac&iacute;o (con ventana delgada). Se presentan, sobre todo, algunos resultados (preliminares) de la dispersi&oacute;n de neutrones de 2.2 MeV sobre plomo natural, usando la reacci&oacute;n D(d,n)3He como fuente.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Secciones transversales para neutrones; t&eacute;cnica de la part&iacute;cula asociada.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 29.25Dz; 29.30Hz</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/v53s3a18.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>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. J.B. Marion and J.L. Fowler, <i>Fast neutron physics, </i>Part II (Interscience Publishers, New York - London 1963).</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8339000&pid=S0035-001X200700090001800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2. J. Csikai, <i>Fast neutron generators </i>(CRC Publ. Co., USA, 1987) Vol. I.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8339001&pid=S0035-001X200700090001800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">3. D.G. Schuster, <i>Nucl. Instr. and Meth. </i><b>76 </b>(1969) 35.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8339002&pid=S0035-001X200700090001800003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">4. R. Cherubini, G. Moschini, R. Nino, R. Policroniades and A. Varela, <i>Nucl. Instr. and Meth. A </i><b>269 </b>(1988) 623.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8339003&pid=S0035-001X200700090001800004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">5. A. Varela, R. Policroniades, J. L&oacute;pez, and R. Maggi, <i>Rev. Mex. Fis. </i><b>38</b> (1992) 875.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8339004&pid=S0035-001X200700090001800005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">6. R. Policroniades, A. Varela, J. L&oacute;pez ,and R. Maggi, <i>Nucl. Instr. and Meth. in Phys. Res. A </i><b>346 </b>(1994) 230.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8339005&pid=S0035-001X200700090001800006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">7. R.L. Hagenbruger, PhD Thesis, University of Wisconsin, Wisconsin (1972) USA. Unpubl.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8339006&pid=S0035-001X200700090001800007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">8. <i>Neutron cross sections, </i>Brookhaven National Laboratories, report <b>BNL 325 </b>(1966) USA.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8339007&pid=S0035-001X200700090001800008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">9. J.L. Fowler and E.C. Campbell, <i>Phys. Rev. </i><b>127 </b>(1962) 2192.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8339008&pid=S0035-001X200700090001800009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> ]]></body><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Marion]]></surname>
<given-names><![CDATA[J.B]]></given-names>
</name>
<name>
<surname><![CDATA[Fowler]]></surname>
<given-names><![CDATA[J.L]]></given-names>
</name>
</person-group>
<source><![CDATA[Fast neutron physics, Part II]]></source>
<year>1963</year>
<publisher-loc><![CDATA[New YorkLondon ]]></publisher-loc>
<publisher-name><![CDATA[Interscience Publishers]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Csikai]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Fast neutron generators]]></source>
<year>1987</year>
<volume>I</volume>
<publisher-name><![CDATA[CRC Publ. Co.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Schuster]]></surname>
<given-names><![CDATA[D.G]]></given-names>
</name>
</person-group>
<source><![CDATA[Nucl. Instr. and Meth]]></source>
<year>1969</year>
<numero>76</numero>
<issue>76</issue>
<page-range>35</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cherubini]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Moschini]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Nino]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Policroniades]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Varela]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[Nucl. Instr. and Meth. A]]></source>
<year>1988</year>
<numero>269</numero>
<issue>269</issue>
<page-range>623</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Varela]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Policroniades]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Maggi]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<source><![CDATA[Rev. Mex. Fis]]></source>
<year>1992</year>
<numero>38</numero>
<issue>38</issue>
<page-range>875</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Policroniades]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Varela]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Maggi]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<source><![CDATA[Nucl. Instr. and Meth. in Phys. Res. A]]></source>
<year>1994</year>
<numero>346</numero>
<issue>346</issue>
<page-range>230</page-range></nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hagenbruger]]></surname>
<given-names><![CDATA[R.L]]></given-names>
</name>
</person-group>
<source><![CDATA[]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="book">
<source><![CDATA[Neutron cross sections]]></source>
<year>1966</year>
<volume>325</volume>
<publisher-name><![CDATA[Brookhaven National Laboratories]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fowler]]></surname>
<given-names><![CDATA[J.L]]></given-names>
</name>
<name>
<surname><![CDATA[Campbell]]></surname>
<given-names><![CDATA[E.C]]></given-names>
</name>
</person-group>
<source><![CDATA[Phys. Rev]]></source>
<year>1962</year>
<numero>127</numero>
<issue>127</issue>
<page-range>2192</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
