<?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>0864-084X</journal-id>
<journal-title><![CDATA[Nucleus]]></journal-title>
<abbrev-journal-title><![CDATA[Nucleus]]></abbrev-journal-title>
<issn>0864-084X</issn>
<publisher>
<publisher-name><![CDATA[CUBAENERGIA]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-084X2018000100009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Charmonium: comparison between potential models]]></article-title>
<article-title xml:lang="es"><![CDATA[Charmonio: comparación entre modelos potenciales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Zaldívar]]></surname>
<given-names><![CDATA[D. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arrebato]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Superior de Tecnologías y Ciencias Aplicadas  ]]></institution>
<addr-line><![CDATA[ La Habana]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<numero>63</numero>
<fpage>9</fpage>
<lpage>11</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-084X2018000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-084X2018000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-084X2018000100009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Heavy quark    c  c ¯ has been studied in the non relativistic framework using a quark-quark potential as a sum of power of the corresponding distance. The form of potential is based on phenomenological facts. The problem was solved numerically using a program written on C++. Mass spectra and the expectation value of the radius have been estimated for different quantum-mechanical states for    c  c ¯ system. The results have been compared with other similar and recent works. The mass spectra obtained is in acceptable agreement with the experimental data for    c  c ¯.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El sistema de quarks pesados    c  c ¯ ha sido estudiado en el marco no relativista usando un potencial quark-quark de la forma de la suma de potencias de la distancia entre las partículas. El problema se resolvió numéricamente usando un programa escrito en C++. Se estimaron el espectro de masa y el valor esperado del radio para diferentes estados de excitación. Los resultados fueron comparados con otros trabajos similares recientes. El espectro de masa obtenido concuerda de manera aceptable con los datos experimentales para el sistema    c  c ¯.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[charmonium]]></kwd>
<kwd lng="en"><![CDATA[potentials]]></kwd>
<kwd lng="en"><![CDATA[mass spectra]]></kwd>
<kwd lng="en"><![CDATA[computer codes]]></kwd>
<kwd lng="en"><![CDATA[schroedinger equation]]></kwd>
<kwd lng="es"><![CDATA[charmonio]]></kwd>
<kwd lng="es"><![CDATA[potenciales]]></kwd>
<kwd lng="es"><![CDATA[espectros de masas]]></kwd>
<kwd lng="es"><![CDATA[códigos para ordenadores]]></kwd>
<kwd lng="es"><![CDATA[ecuación de Schroedinger]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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