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. O. Zheltonozhsky¹, A. M. Savrasov^1,*, P. S. Derechkey², L. V. Sadovnikov¹, V. T. Maslyuk<sup>2

1</sup> Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine
² Institute of Electronic Physics, National Academy of Sciences of Ukraine, Uzhgorod, Ukraine

^*Corresponding author. E-mail address: asavrasov@kinr.kiev.ua

Abstract: For the first time, the flux-weighted average yields were measured of the ¹³⁰Ba(γ, n)¹²⁹Ba, ¹³²Ba(γ, n)¹³¹Ba^m+g, ¹³⁶Ba(γ, n)¹³⁵Ba^m, ¹⁴²Nd(γ, n)¹⁴¹Nd^m, ¹⁴²Nd(γ, n)¹⁴¹Nd^m+g and ¹⁵⁰Nd(γ, n)¹⁴⁹Nd at E_br = 19 MeV, the values of which were: 114^(+7.4)(10), 113(8), 17.0(12), 9.5(7), 104.5(80) and 83(8) mb, respectively. The measured flux-weighted average yields of most reactions are in satisfactory agreement with the results, obtained from the works of other authors and with the results of simulations within the TALYS-1.96 code. The statistical mechanism of all the above-mentioned reactions is established.

Keywords: flux-weighted average yields, cross-sections, activation method, gamma-spectrometry, TALYS-1.96 code, photonuclear reactions.

1. Yu.P. Gangrskiy, V.M. Mazur. The scattering of γ-quanta by nuclei and excitation isomer states. Phys. Part. Nuclei 33 (2002) 158. (Rus) http://www1.jinr.ru/Archive/Pepan/v-33-1/v-33-1-4.pdf

2. S.N. Beljaev, V.A. Semenov. Analysis of the intermediate structure in the (γ,n)-cross sections on nuclei with N = 82. Bull. Acad. Sci. USSR. Phys. Ser. 55(5) (1991) 66.

3. P. Carlos et al. The giant dipole resonance in the transition region for the neodymium isotopes. Nucl. Phys. A 172 (1971) 437. https://doi.org/10.1016/0375-9474(71)90725-1

4. A.G. Belov et al. Measurement of the isomer ratio in (γ,n) reactions for the barium isotopes. Phys. Atom. Nuclei 59 (1996) 367.

5. V.M. Mazur, Z.M. Bigan. Cross section of excitation of isomeric states for ^129mBa, ^131mBa, ^135mBa isotopes in (γ,n) reactions. Ukr. J. Phys. 46 (2001) 529. http://archive.ujp.bitp.kiev.ua/files/journals/46/5-6/46_56_03.pdf

6. T.D. Thiep et al. The isomeric ratios in photonuclear reactions of natural barium induced by bremsstrahlungs with endpoint energies in the giant dipole resonance region. J. Radioanal. Nucl. Chem. 292 (2012) 89. https://doi.org/10.1007/s10967-011-1371-9

7. V.V. Varlamov et al. New data on (γ, n), (γ, 2n), and (γ, 3n) partial photoneutron reactions. Phys. Atom. Nuclei 76 (2013) 1403. https://doi.org/10.1134/S1063778813110148

8. A. Veyssiere et al. Photoneutron cross sections of ²⁰⁸Pb and ¹⁹⁷Au. Nucl. Phys. A 159 (1970) 561. https://doi.org/10.1016/0375-9474(70)90727-X

9. V.A. Zheltonozhsky et al. Excitation of ^177,178Lu in reactions with bremsstrahlung with escaping of charged particles. Nucl. Instrum. Meth. B 476 (2020) 68. https://doi.org/10.1016/j.nimb.2020.04.012

10. Scheme of ¹⁹⁶Au decay.

11. M.V. Strilchuk. The WinSpectrum manual (Kyiv: Institute for Nuclear Research, 2000) 14 p. (Unpublished).

12. S. Agostinelli et al. GEANT4 - a simulation toolkit. Nucl. Instrum. Meth. A 506 (2003) 250. https://doi.org/10.1016/S0168-9002(03)01368-8

13. NUDAT3. https://www.nndc.bnl.gov/nudat3/

14. J.F. Briesmeister. MCNP - A General Monte Carlo N-Particle Transport Code. Version 4B. Report No. LA 12625 M (New Mexico, Los Alamos National Laboratory, 1997).

15. V. Zheltonozhsky, A. Savrasov. Population cross-section of ^179m2Hf from the reactions on hafnium and tantalum targets. Nucl. Instrum. Meth. B 438 (2019) 20. https://doi.org/10.1016/j.nimb.2018.10.007

16. V.M. Mazur, V.A. Zheltonozhsky, Z.M. Bigan. Investigation of isomer states excitation in (γ,n) reactions on nuclei shell near N = 82. Phys. Atom. Nuclei 58(6) (1995) 898.

17. A.J. Koning, D. Rochman. Modern nuclear data evaluation with the TALYS Code System. Nucl. Data Sheets 113 (2012) 2841. https://doi.org/10.1016/j.nds.2012.11.002

18. V.O. Zheltonozhsky et al. Investigation of (γ, xpxn)-reactions on titanium, lutetium, nickel and chromium nuclei at E_br = 37 MeV. Rad. Phys. Chem. 216 (2024) 111387. https://doi.org/10.1016/j.radphyschem.2023.111387

19. A. Gilbert, A.G.W. Cameron. A composite nuclear-level density formula with shell corrections. Can. J. Phys. 43 (1965) 1446. https://doi.org/10.1139/p65-139