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• W2057425612 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 {sup 208}Pb, {sup 144}Sm, {sup 116}Sn, and {sup 90}Zr. 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 {sup 90}Zr) can be well fitted using appropriate values for the free parameters mentioned above. It is alsomore » found that these values allow for a good description of the experimentally measured {sup 112}Sn and {sup 124}Sn decay widths. In addition, we give a prediction for the decay width of the exotic isotope {sup 132}Sn 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.« less" @default.
• W2057425612 created "2016-06-24" @default.
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• W2057425612 date "2008-04-10" @default.
• W2057425612 modified "2023-09-30" @default.
• W2057425612 title "Nonlinear classical model for the decay widths of isoscalar giant monopole resonances" @default.
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• W2057425612 doi "https://doi.org/10.1103/physrevc.77.044305" @default.
• W2057425612 hasPublicationYear "2008" @default.
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