<?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>S0035-001X2011000700004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Searching for the origin of isoscaling: confinement and expansion]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dorso]]></surname>
<given-names><![CDATA[C.O.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Giménez Molinelli]]></surname>
<given-names><![CDATA[P.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Buenos Aires Departamento de Física ]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="A02">
<institution><![CDATA[,University of Texas at El Paso  ]]></institution>
<addr-line><![CDATA[El Paso Texas]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<fpage>14</fpage>
<lpage>17</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000700004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000700004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000700004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this article the dynamical origin of isoscaling, the phenomenon first observed in heavy ion reactions, is explored by studying classical molecular dynamics simulations. Systems composed of neutron and proton-like particles and resembling a compound nucleus produced in heavy ion reactions are allowed to undergo a phase transition into clusters both while confined and during free expansion. Varying the isotopic number while maintaining the same atomic number, these simulations are used to obtain isoscaling fits of the ratio of fragment yields, and to elucidate the effect the dynamics of the reaction has on the isoscaling coefficients. It is observed that breakups at high density and before their final expansion are dominant in setting the values of the isoscaling coefficients &#945; and &#946;.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este artículo se explora el origen dinámico de la isoescala, fenómeno observado inicialmente en reacciones de iones pesados, usando simulaciones de dinámica molecular clásica. Sistemas compuestos de partículas similares a neutrones y protones y representando un núcleo compuesto producido en reacciones de iones pesados son permitidos sufrir un cambio de fase hacia cúmulos durante un confinamiento y una expansión libre. Variando el número isotópico manteniendo el número atómico constante, estas simulaciones son usadas para obtener ajustes de isoescala al cociente de las producciones de fragmentos, y para elucidar el efecto de la dinámica que la reacción tiene en los coeficientes de isoescala. Se observa que los rompimientos a altas densidades y anteriores a la expansion final dominan al determinar el valor de los coeficientes de isoescala &#945; y &#946;.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Isoscaling]]></kwd>
<kwd lng="en"><![CDATA[nuclear matter]]></kwd>
<kwd lng="en"><![CDATA[equation of state]]></kwd>
<kwd lng="en"><![CDATA[molecular dynamics]]></kwd>
<kwd lng="en"><![CDATA[nuclear reactions]]></kwd>
<kwd lng="en"><![CDATA[fragmentation]]></kwd>
<kwd lng="es"><![CDATA[Isoescala]]></kwd>
<kwd lng="es"><![CDATA[material nuclear]]></kwd>
<kwd lng="es"><![CDATA[ecuación de estado]]></kwd>
<kwd lng="es"><![CDATA[dinámica molecular]]></kwd>
<kwd lng="es"><![CDATA[reacciones nucleares]]></kwd>
<kwd lng="es"><![CDATA[fragmentación]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>Searching for the origin of isoscaling: confinement and expansion</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>C.O. Dorso,<sup>a</sup> P.A. Gim&eacute;nez Molinelli<sup>a</sup> and J.A. L&oacute;pez<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"><sup>a</sup> <i>Departamento de F&iacute;sica, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina.</i></font></p>     <p align="justify"><font face="verdana" size="2"><sup>b</sup> <i>University of Texas at El Paso, El Paso, Texas 79968, USA.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 10 de marzo de 2010    <br> Aceptado el 31 de agosto de 2010</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">In this article the dynamical origin of isoscaling, the phenomenon first observed in heavy ion reactions, is explored by studying classical molecular dynamics simulations. Systems composed of neutron and proton&#150;like particles and resembling a compound nucleus produced in heavy ion reactions are allowed to undergo a phase transition into clusters both while confined and during free expansion. Varying the isotopic number while maintaining the same atomic number, these simulations are used to obtain isoscaling fits of the ratio of fragment yields, and to elucidate the effect the dynamics of the reaction has on the isoscaling coefficients. It is observed that breakups at high density and before their final expansion are dominant in setting the values of the isoscaling coefficients <i>&alpha;</i> and <i>&beta;</i>.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Isoscaling; nuclear matter; equation of state; molecular dynamics; nuclear reactions; fragmentation.</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">En este art&iacute;culo se explora el origen din&aacute;mico de la isoescala, fen&oacute;meno observado inicialmente en reacciones de iones pesados, usando simulaciones de din&aacute;mica molecular cl&aacute;sica. Sistemas compuestos de part&iacute;culas similares a neutrones y protones y representando un n&uacute;cleo compuesto producido en reacciones de iones pesados son permitidos sufrir un cambio de fase hacia c&uacute;mulos durante un confinamiento y una expansi&oacute;n libre. Variando el n&uacute;mero isot&oacute;pico manteniendo el n&uacute;mero at&oacute;mico constante, estas simulaciones son usadas para obtener ajustes de isoescala al cociente de las producciones de fragmentos, y para elucidar el efecto de la din&aacute;mica que la reacci&oacute;n tiene en los coeficientes de isoescala. Se observa que los rompimientos a altas densidades y anteriores a la expansion final dominan al determinar el valor de los coeficientes de isoescala <i>&alpha;</i> y <i>&beta;</i>.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Isoescala; material nuclear; ecuaci&oacute;n de estado; din&aacute;mica molecular; reacciones nucleares; fragmentaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS:24.10.Lx, 02.70.Ns.</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/v57s1/v57s1a4.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">C.O.D. is a member of the "Carrera del Investigador" CONICET supported by the Universidad de Buenos Aires, CONICET through grant PIP5969.</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. H.S. Xu <i>et al., Phys. Rev. Lett. </i><b>85</b> (2000) 716.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8374496&pid=S0035-001X201100070000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">2. H. Johnston <i>et al., Phys. Lett. B </i><b>3715</b> (1996) 186.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8374498&pid=S0035-001X201100070000400002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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