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Nonlinear classical model for the decay widths of isoscalar giant monopole resonances

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dc.contributor.author Papachristou, PK en
dc.contributor.author Mavrommatis, E en
dc.contributor.author Constantoudis, V en
dc.contributor.author Diakonos, FK en
dc.contributor.author Wambach, J en
dc.date.accessioned 2014-03-01T01:28:52Z
dc.date.available 2014-03-01T01:28:52Z
dc.date.issued 2008 en
dc.identifier.issn 0556-2813 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/19004
dc.subject.classification Physics, Nuclear en
dc.subject.other ONE-BODY DISSIPATION en
dc.subject.other DEPENDENT POTENTIAL WELL en
dc.subject.other INDEPENDENT-PARTICLE GAS en
dc.subject.other NUCLEAR-DYNAMICS en
dc.subject.other CHAOTIC DYNAMICS en
dc.subject.other BREATHING MODE en
dc.subject.other ATOMIC-NUCLEI en
dc.subject.other EXCITATION en
dc.subject.other PB-208 en
dc.subject.other STABILITY en
dc.title Nonlinear classical model for the decay widths of isoscalar giant monopole resonances en
heal.type journalArticle en
heal.identifier.primary 10.1103/PhysRevC.77.044305 en
heal.identifier.secondary http://dx.doi.org/10.1103/PhysRevC.77.044305 en
heal.identifier.secondary 044305 en
heal.language English en
heal.publicationDate 2008 en
heal.abstract The decay of the isoscalar giant monopole resonance (ISGMR) in nuclei is studied by means of a nonlinear classical model consisting of several noninteracting nucleons (particles) moving in a potential well with an oscillating nuclear surface (wall). The motion of the nuclear surface is described by means of a collective variable that appears explicitly in the Hamiltonian as an additional degree of freedom. The total energy of the system is therefore conserved. Although the particles do not directly interact with each other, their motions are indirectly coupled by means of their interaction with the moving nuclear surface. We consider as free parameters in this model the degree of collectivity and the fraction of nucleons that participate to the decay of the collective excitation. Specifically, we have calculated the decay width of the ISGMR in the spherical nuclei Pb208, Sm144, Sn116, and Zr90. Despite its simplicity and its purely classical nature, the model reproduces the trend of the experimental data that show that with increasing mass number the decay width decreases. Moreover the experimental results (with the exception of Zr90) can be well fitted using appropriate values for the free parameters mentioned above. It is also found that these values allow for a good description of the experimentally measured Sn112 and Sn124 decay widths. In addition, we give a prediction for the decay width of the exotic isotope Sn132 for which there is experimental interest. The agreement of our results with the corresponding experimental data for medium-heavy nuclei is dictated by the underlying classical mechanics, i.e., the behavior of the maximum Lyapunov exponent as a function of the system size. © 2008 The American Physical Society. en
heal.publisher AMER PHYSICAL SOC en
heal.journalName Physical Review C - Nuclear Physics en
dc.identifier.doi 10.1103/PhysRevC.77.044305 en
dc.identifier.isi ISI:000255457700023 en
dc.identifier.volume 77 en
dc.identifier.issue 4 en


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