Abstract
The new coupled-reaction channel model for the subbarrier fusion of heavy ions is presented. The low-energy surface vibrational states of both nuclei are described in the harmonic oscillator approach. The coupling channel potentials are evaluated numerically using the harmonic oscillator wave functions and the expressions for the potential energy. The approximate solution of the coupled reaction channel equations is obtained using the diagonalization at the barrier. All one- and two-phonon channels related to the \(2^+\) and \(3^-\) states in both nuclei are taken into account. The experimental data for the heavy-ion fusion reactions \(^{64}\)Ni+\(^{64}\)Ni, \(^{48}\)Ti+\(^{58}\)Fe, and \(^{54}\)Fe+\(^{58}\)Ni are well described in the model. The dressed and bare heavy-ion potentials are discussed in detail. It is shown that dressed potential is smaller than the bare one around the barrier, which leads to the enhancements of the barrier transmission. The manifestations of the shell effects on both the nucleus-nucleus potential and subbarrier fusion are discussed in detail.
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Data Availability Statement
This manuscript has no associated data or the data will not be deposited. [Authors’ comment: This is a theoretical study. The experimental data described in this study have been published in refereed papers.]
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Acknowledgements
The author strongly thanks the support of Professors Fabiana Gramegna, Enrico Fioretto, Giovanna Montagloli, and Alberto Stefanini. The author thanks for the support to Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro of Istituto Nazionale di Fisica Nucleare, the National Academy of Sciences of Ukraine and Taras Shevchenko National University of Kiev.
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Communicated by Alexis Diaz-Torres.
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Denisov, V.Y. Multidimensional harmonic oscillator model of subbarrier fusion. Eur. Phys. J. A 58, 91 (2022). https://doi.org/10.1140/epja/s10050-022-00746-2
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DOI: https://doi.org/10.1140/epja/s10050-022-00746-2