Methods and related parameters for modelling gamma-ray cascades due to the gamma-transitions in highly excited nuclei will be reviewed. Analytical expressions for the photon strength functions (PSF) will be done with allowance for low-energy enhancement due to the nuclear structure effects (presence of low-energy resonance). The models and formulae previously recommended for the PSF will be updated, additionally tested and validated. Recommended sets and systematics of the parameters for PSF’s calculations will be prepared. Computer code for PSF calculations within recommended models will be prepared and adopted for the use in the different codes for nuclear reaction calculations. Applications of the results to the gamma transitions in different nuclear processes (neutron induced nuclear reactions, isomeric ratios of primary fission fragments) will be considered.

Reliable theoretical and clear physical methods will be applied.

Final expressions for the average description of gamma-transitions will be tested and validated with the use of modern experimental data.

Goriely S., Plujko V.

**Simple empirical E1 and M1 strength functions for practical applications**

Phys. Rev. C. -2019. -V.99. 014303(8).

S. Goriely, P. Dimitriou, M. Wiedeking, T. Belgya, R. Firestone, J. Kopecky, M. Krticka, V. Plujko, R. Schwengner, S. Siem, H. Utsunomiya, S. Hilaire, S. Peru, Y. S. Cho, D. M. Filipescu, N. Iwamoto, T. Kawano, V. Varlamov, R. Xu

**Reference database for photon strength functions**

European Physical Journal A -2019. –V.55: 172.

V.A. Plujko, S. Goriely, O.M. Gorbachenko, K.M. Solodovnyk

**Test of models for photon strength functions of electric dipole photoexcitation**

Nuclear Physics and Atomic Energy. – 2019. – V. 20 - P.213-220.

V. Plujko, O. Gorbachenko, K. Solodovnyk

**Description of nuclear photoexcitation by Lorentzian expressions for electric dipole photon strength function **

European Physical Journal A. – 2019. – V.55: 210.

Plujko V.A., Gorbachenko O.M., Capote R., Dimitriou P.

**Giant dipole resonance parameters of ground-state photoabsorption:**** ****Experimental values with uncertainties**

Atomic Data and Nuclear Data Tables. - 2018. - V. 123-124. – P. 1-85.

Kadenko I.M.., Plujko V.A.,Bondar B.M. et al,

**P****rompt gamma-rays from fast neutron capture in **^{nat}**N****i **

Nuclear Physics and Atomic Energy. - 2016. – V.17 ¹2. –P. 122-129.

Plujko V.A., Capote R., Gorbachenko O. M.

Giant dipole resonance parameters with uncertainties from photonuclear cross sections

Atomic Data and Nuclear Data Tables. - 2011. - V. 97. – P. 567–585.

Capote R., Herman M., Oblozinsky P., Young P., Goriely S., Belgya T., Ignatyuk A.V., Koning A., Hilaire S., Plujko V., et al

**RIPL-Reference input parameter library for calculations of nuclear reactions and nuclear data evaluation **

Nuclear Data Sheets, 2009.- V.110. – P. 3107-3214; http://www-nds.iaea.org/RIPL-3/

Plujko V.A., Gorbachenko O.M.

**Effect of vibrational states on nuclear level density**

Phys. At. Nucl. – 2007.- V.70. –P.1643-1649.

Plujko V.A.

**An investigation of interplay between dissipation mechanisms**** ****in heated Fermi-systems by means of radiative strength functions**** **

Nucl.Phys. -1999.- V.A649 -P. 209c-213c.

Kolomietz V.M., Lukyanov S.V., Plujko V.A., Shlomo S.

**Collisional relaxation of collective motion in a finite**** ****Fermi liquid**** **

Phys. Rev. -1998. – V.C58 –P. 198-208.

Kolomietz V.M., Plujko V.A., Shlomo S.

**Interplay between one-body and collisional damping of collective**** ****motion in nucle****i**

Phys. Rev.- 1996.- V.C 54 –P. 3014-3024.

Denisov V.Yu., Plujko V. A.

**Problems of physics of atomic nuclei and nuclear reactions**** **(in Russian)

Scientific Monograph, Kyiv, TSNU, Publ.Co., 2013, 412pp**., **²SBN 978-966-439-673-5.

Kadenko I.M., Plujko V.A.

**Physics of atomic nuclei** **and particles **(in Ukrainian)

Textbook, Kyiv, TSNU, Publ.Co., 2019, 480pp**., **ISBN 978-966-433-022-2.