<?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>S0035-001X2011000100004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Scattering of nucleons from nuclei with couplings to particle-unstable excited states]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fraser]]></surname>
<given-names><![CDATA[P.R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Amos]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Canton]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Karataglidis]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Svenne]]></surname>
<given-names><![CDATA[J.P.]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Knijff]]></surname>
<given-names><![CDATA[D. van der]]></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[,University of Melbourne School of Physics ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Australia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Istituto Nazionale di Fisica Nucleare  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Italy</country>
</aff>
<aff id="A04">
<institution><![CDATA[,University of Johannesburg Department of Physics ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>South Africa</country>
</aff>
<aff id="A05">
<institution><![CDATA[,University of Manitoba and Winnipeg Institute for Theoretical Physics Department of Physics and Astronomy]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Canada</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>
<numero>1</numero>
<fpage>20</fpage>
<lpage>29</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The physics of radioactive ion beams implies the description of weakly-bound nuclear systems. One key aspect concerns the coupling to low-lying collective-type excited states, which for these systems might not be stable levels, but particle emitting resonances. In this work we describe how the scattering cross section and compound spectra change when the colliding fragments have such collective excitations featuring particle emission. We explore this question in the framework of a multi-channel algebraic scattering method of determining nucleon-nucleus cross sections at low energies. For a range of light-mass, particle-unstable nuclear targets, scattering cross sections as well as the spectra of the compound nuclei formed have been determined from calculations that do and do not consider particle emission widths for nuclear states. Assuming a resonance character for target states markedly varies evaluated cross sections from those obtained assuming the target spectrum to have entirely discrete states.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La física de haces de iones radiactivos implica la descripción de sistemas nucleares debilmente ligados. Un aspecto clave de interés es el acoplamiento estados excitados de tipo colectivo yaciendo en niveles bajos, que para estos sistemas podrían no ser niveles estables, pero las partículas que emiten resonancias. En este trabajo se describe como la sección eficaz de dispersión y el cambio de espectros compuestos cuando los fragmentos que chocan tienen tales excitaciones colectivas caracterizando la emisión de partículas. Nosotros abordamos esta pregunta en el marco de un método de dispersión algebráíco multi-canal para determinar las secciones transversales nucleón-núcleo a bajas energías. Para un rango objetivos nucleares de partículas inestables livianas, las secciones transversales de dispersión, así como los espectros de los núcleos compuestos formados han sido determinados por los cálculos que consideran o no los anchos de emisión de partículas para los estados nucleares. Suponiendo un carácter resonante para los estados objetivos, las secciones transversales varían considerablemente de aquellas obtenidas suponiendo que el espectro objetivo tiene completamente estados discretos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Nuclear reactions]]></kwd>
<kwd lng="en"><![CDATA[radioactive ion beams]]></kwd>
<kwd lng="en"><![CDATA[neutron scattering]]></kwd>
<kwd lng="en"><![CDATA[proton scattering]]></kwd>
<kwd lng="en"><![CDATA[resonances]]></kwd>
<kwd lng="es"><![CDATA[Reacciones nucleares]]></kwd>
<kwd lng="es"><![CDATA[haces de iones radiactivos]]></kwd>
<kwd lng="es"><![CDATA[dispersión de neutrones]]></kwd>
<kwd lng="es"><![CDATA[dispersión de protones]]></kwd>
<kwd lng="es"><![CDATA[resonancias]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="4"><b>Scattering of nucleons from nuclei with couplings to particle&#150;unstable excited states</b></font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="2"><b>P.R. Fraser<sup>a,b,*</sup>, K. Amos<sup>b</sup>, L. Canton<sup>c</sup>, S. Karataglidis<sup>d</sup>, J.P. Svenne<sup>e</sup>, and D. van der Knijff<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><sup>a </sup>Instituto de Ciencias Nucleares, Universidad Nacional Aut&oacute;noma de M&eacute;xico, M&eacute;xico, D.F., 04510, M&eacute;xico. e&#150;mail:</i> <a href="mailto:paul.fraser@nucleares.unam.mx">paul.fraser@nucleares.unam.mx</a>.</font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>b </sup>School of Physics, University of Melbourne, Victoria 3010, Australia.</i></font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I&#150;35131, Italy.</i></font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>d</sup> Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa.</i></font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>e </sup>Department of Physics and Astronomy, University of Manitoba and Winnipeg Institute for Theoretical Physics, Winnipeg, MB, R3T 2N2, Canada.</i></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">Recibido el 24 de mayo de 2010    <br>     Aceptado el 30 de noviembre de 2010</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">The physics of radioactive ion beams implies the description of weakly&#150;bound nuclear systems. One key aspect concerns the coupling to low&#150;lying collective&#150;type excited states, which for these systems might not be stable levels, but particle emitting resonances. In this work we describe how the scattering cross section and compound spectra change when the colliding fragments have such collective excitations featuring particle emission. We explore this question in the framework of a multi&#150;channel algebraic scattering method of determining nucleon&#150;nucleus cross sections at low energies. For a range of light&#150;mass, particle&#150;unstable nuclear targets, scattering cross sections as well as the spectra of the compound nuclei formed have been determined from calculations that do and do not consider particle emission widths for nuclear states. Assuming a resonance character for target states markedly varies evaluated cross sections from those obtained assuming the target spectrum to have entirely discrete states.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Nuclear reactions; radioactive ion beams; neutron scattering; proton scattering; resonances.</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>Resumen</b></font></p> 	    <p align="justify"><font face="verdana" size="2">La f&iacute;sica de haces de iones radiactivos implica la descripci&oacute;n de sistemas nucleares debilmente ligados. Un aspecto clave de inter&eacute;s es el acoplamiento estados excitados de tipo colectivo yaciendo en niveles bajos, que para estos sistemas podr&iacute;an no ser niveles estables, pero las part&iacute;culas que emiten resonancias. En este trabajo se describe como la secci&oacute;n eficaz de dispersi&oacute;n y el cambio de espectros compuestos cuando los fragmentos que chocan tienen tales excitaciones colectivas caracterizando la emisi&oacute;n de part&iacute;culas. Nosotros abordamos esta pregunta en el marco de un m&eacute;todo de dispersi&oacute;n algebr&aacute;&iacute;co multi&#150;canal para determinar las secciones transversales nucle&oacute;n&#150;n&uacute;cleo a bajas energ&iacute;as. Para un rango objetivos nucleares de part&iacute;culas inestables livianas, las secciones transversales de dispersi&oacute;n, as&iacute; como los espectros de los n&uacute;cleos compuestos formados han sido determinados por los c&aacute;lculos que consideran o no los anchos de emisi&oacute;n de part&iacute;culas para los estados nucleares. Suponiendo un car&aacute;cter resonante para los estados objetivos, las secciones transversales var&iacute;an considerablemente de aquellas obtenidas suponiendo que el espectro objetivo tiene completamente estados discretos.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Reacciones nucleares; haces de iones radiactivos; dispersi&oacute;n de neutrones; dispersi&oacute;n de protones; resonancias.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">PACS: 24.10.Eq; 24.30.&#150;v; 25.40.&#150;h; 25.60.&#150;t</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/v57n1//v57n1a4.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font><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. 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