Nuclear Physics and Atomic Energy

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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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Nucl. Phys. At. Energy 2000, volume 1, issue 1, pages 7-24.
Section: Nuclear Physics.
Published online: 30.06.2000.
PDF Full text (en)
https://doi.org/10.15407/jnpae2000.01.007

Statistical description of the radiative strength function

V. A. Plujko1, S. N. Ezhov2, A. S. Mikulyak2

1Institute for Nuclear Research of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
2Kyiv Taras Shevchenko National University, Kyiv, Ukraine

Abstract: A closed-form thermodynamic pole approach is developed for average description of the E1 radiative strength functions using the microcanonical ensemble for initial states. A semiclassical description of the collective excitation damping in the method is based on modern physical notion on the relaxation processes in Fermi systems. It is shown that the model is able to cover a relatively wide energy interval, ranging from zeroth gamma-ray energy to values above GDR peak energy. It gives rather accurate means of simultaneous description of the γ-decay and photoabsorption strength functions in the medium and heavy nuclei. For gamma-ray energies near neutron binding energies the calculations within the proposed model describe experimental data somewhat better for heavy nuclei with A > 150 as compared to other closed-form approaches.

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