<?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>S0035-001X2006000700012</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[IBM-2 configuration mixing and its geometric interpretation for germanium isotopes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Padilla-Rodal]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castaños]]></surname>
<given-names><![CDATA[O]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bijker]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galindo-Uribarri]]></surname>
<given-names><![CDATA[A]]></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[,Oak Ridge National LaboratoryMéxico Physics Division ]]></institution>
<addr-line><![CDATA[Tennessee ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2006</year>
</pub-date>
<volume>52</volume>
<fpage>57</fpage>
<lpage>62</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2006000700012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2006000700012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2006000700012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The low energy spectra, electric quadrupole transitions, and quadrupole moments for the germanium isotopes are determined in the formalism of the IBM-2 with configuration mixing. These calculated observables reproduce well the available experimental information including the newly obtained data for radioactive neutron-rich 78,80,82Ge isotopes. Using a matrix formulation, a geometric interpretation of the model was established. The two energy surfaces determined after mixing, carry information about the deformation parameters of the nucleus. For the even-even Ge isotopes the obtained results are consistent with the shape transition that takes place around the neutron number N = 40.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los niveles de baja energía, las transiciones cuadrupolares eléctricas y los momentos cuadrupolares de los isótopos de germanio son determinados en el formalismo del IBM-2 con mezcla de configuraciones. Las observables calculadas reproducen bien la información experimental disponible incluyendo datos obtenidos recientemente para los isótopos radiactivos con exceso de neutrones 78,80,82Ge. Utilizando una formulación matricial, se estableció una interpretación geométrica del modelo. Las dos superficies de energía determinadas después de la mezcla, contienen información acerca de los parámetros de deformación del núcleo. Los resultados obtenidos para los isótopos par-par de Ge son consistentes con la transición de fase que ocurre alrededor del número de neutrones TV = 40.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Interacting boson model]]></kwd>
<kwd lng="en"><![CDATA[configuration mixing]]></kwd>
<kwd lng="en"><![CDATA[shape transition]]></kwd>
<kwd lng="en"><![CDATA[germanium isotopes]]></kwd>
<kwd lng="es"><![CDATA[Modelo de bosones interactuantes]]></kwd>
<kwd lng="es"><![CDATA[mezcla de configuraciones]]></kwd>
<kwd lng="es"><![CDATA[transición de forma]]></kwd>
<kwd lng="es"><![CDATA[isótopos de germanio]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>IBM&#150;2 configuration mixing and its geometric interpretation for germanium isotopes</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>E. Padilla&#150;Rodal<sup>a,b</sup>, O. Casta&ntilde;os", R. Bijker<sup>a</sup>, and A. Galindo&#150;Uribarri<sup>b</sup></b></font></p>     <p align="center"><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, </i><i>04510 M&eacute;xico, D.F., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Physics Division, Oak Ridge National Laboratory, </i><i>Oak Ridge, Tennessee 37831.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 28 de enero de 2005    <br>   Aceptado el 15 de marzo de 2005</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 low energy spectra, electric quadrupole transitions, and quadrupole moments for the germanium isotopes are determined in the formalism of the IBM&#150;2 with configuration mixing. These calculated observables reproduce well the available experimental information including the newly obtained data for radioactive neutron&#150;rich <sup>78</sup>,<sup>80</sup>,<sup>82</sup>Ge isotopes. Using a matrix formulation, a geometric interpretation of the model was established. The two energy surfaces determined after mixing, carry information about the deformation parameters of the nucleus. For the even&#150;even Ge isotopes the obtained results are consistent with the shape transition that takes place around the neutron number N = 40.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Interacting boson model; configuration mixing; shape transition; germanium isotopes.</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">Los niveles de baja energ&iacute;a, las transiciones cuadrupolares el&eacute;ctricas y los momentos cuadrupolares de los is&oacute;topos de germanio son determinados en el formalismo del IBM&#150;2 con mezcla de configuraciones. Las observables calculadas reproducen bien la informaci&oacute;n experimental disponible incluyendo datos obtenidos recientemente para los is&oacute;topos radiactivos con exceso de neutrones <sup>78</sup>,<sup>80</sup>,<sup>82</sup>Ge. Utilizando una formulaci&oacute;n matricial, se estableci&oacute; una interpretaci&oacute;n geom&eacute;trica del modelo. Las dos superficies de energ&iacute;a determinadas despu&eacute;s de la mezcla, contienen informaci&oacute;n acerca de los par&aacute;metros de deformaci&oacute;n del n&uacute;cleo. Los resultados obtenidos para los is&oacute;topos par&#150;par de Ge son consistentes con la transici&oacute;n de fase que ocurre alrededor del n&uacute;mero de neutrones TV = 40.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Modelo de bosones interactuantes; mezcla de configuraciones; transici&oacute;n de forma; is&oacute;topos de germanio.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 21.60.&#150;n; 21.60.Fw; 27.50.+e</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/v52s1/v52s1a12.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>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">This work was partially supported by CONACyT. Oak Ridge National Laboratory is managed by UT&#150;Battelle, LLC, for the U.S. DOE under the Contract DE&#150;AC05&#150;00OR22725.</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. E. Padilla&#150;Rodal, Ph. D. 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