Wambach, JConstantoudis, VPapachristou, PKDiakonos, FKMavrommatis, EThe 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.http://hdl.handle.net/123456789/1900477410.1103/PhysRevC.77.044305ISI:0002554577000230556-2813engAMER PHYSICAL SOCPhysical Review C - Nuclear PhysicsNUCLEAR-DYNAMICSDEPENDENT POTENTIAL WELLEXCITATIONPB-208STABILITYBREATHING MODEATOMIC-NUCLEIINDEPENDENT-PARTICLE GASONE-BODY DISSIPATIONCHAOTIC DYNAMICSNonlinear classical model for the decay widths of isoscalar giant monopole resonancesjournalArticle2008Δημοσίευση σε περιοδικόPublication in journalΠυρηνική φυσικήNuclear Physicsisi - Physics, Nuclear includes resources on the study of nuclear structure, decay, radioactivity, reactions, and scattering. Resources in this category focus on low-energy physics. High-energy physics is covered in the PHYSICS, PARTICLES & FIELDS category.Επιστημονικό άρθροScientific articleΕθνικό Μετσόβιο ΠολυτεχνείοGreek Aggregator OpenArchives.gr | National Documentation Centre (EKT)other