Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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V. M. Kolomietz¹, S. V. Lukyanov¹, O. O. Khudenko<sup>1,2

1</sup>Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine
²Kyiv Taras Shevchenko National University, Kyiv, Ukraine

Abstract: Energy weighted sums (EWS) m_k have been evaluated within the framework of the kinetic theory. We have investigated the dependence of the EWS on the boundary conditions and the structure of the nuclear forces. The dependence of the enhancement factor 1+κ_I of the model-independent sum m₁ on the nuclear mass number has been established. The Landau's isovector amplitude F^'₁ ≈ 1.2 and the isovector symmetry surface energy σ_sym ≈ 30 MeV have been evaluated from the fit of the enhancement factor 1+κ_I to the experimental data.

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