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Current issue   Ukr. J. Phys. 2017, Vol. 62, N 4, p.285-293


Zheltonozhskyi V.O.1, Savrasov A.M.1, Solodovnyk K.M.1,2, Plujko V.A.2, Gorbachenko O.M.2, Davydovska O.I.1

1 Institute for Nuclear Research, Nat. Acad. of Sci. of Ukraine
(47, Nauky Ave., Kyiv 03028, Ukraine; e-mail: zhelton@kinr.kiev.ua)
2 Taras Shevchenko National University of Kyiv, Faculty of Physics
(60, Volodymyrs’ka Str., Kyiv 01033, Ukraine)

Isomer Ratios and Mean Angular Momenta of Primary 97Nb Fragments at 235U and 238U Photofission

Section: Nuclei and Nuclear Reactions
Original Author's Text: Ukrainian

Abstract:  The isomeric yield ratios are measured for 97Nb fragments obtained at the bremsstrahlung photofission of 235U and 238U nuclei with gamma-quantum end-point energies of 10.5, 12.0, and 18.0 MeV. The mean angular momenta of primary fission fragments are determined, by using the generalized Huizenga–Vandenbosh statistical model and with the help of TALYS 1.6 and EMPIRE 3.2 codes.

Key words: photofission, isomeric ratios, mean angular momenta of fission fragments.


  1. R. Vandenbosh, J.R. Huizenga. Nuclear Fission (Academic Press, 1973).
  2. D.C. Aumann, W. Guckel, E. Nirschl, H. Zeising. Independent isomeric yield ratio of 148Pm in fission of the moderately excited 236U compound nucleus as a measure of fragment angular momentum. Phys. Rev. 16, 254 (1977).
  3. V.Yu. Denisov, S.V. Reshitko. Mean angular momentum of nuclear-fission fragments. Phys. At. Nucl. 62, 1806 (1999).
  4. I.N. Mikhailov, P. Quentin, Ch. Briancon. Angular momentum of fission fragments. Phys. At. Nucl. 64, 1185 (2001).
  5. M.G. Davydov, V.G. Magera, A.V. Trukhov. Isomeric yield ratios of photonuclear reactions. At. Energiya 62, 236 (1987) (in Russian).
  6. M.G. Davydov, V.G. Magera, A.V. Trukhov, E.M. Shomurodov. Isomeric yield ratios of photonuclear reactions for -activation analysis. At. Energiya 58, 47 (1985) (in Russian).
  7. I.N. Vishnevskii, V.Yu. Denisov, V.A. Zheltonozhskyi, S.V. Reshit'ko, L.V. Sadovnikov, N.V. Strilchuk. Mean angular momenta of 232Th fission fragments. Yad. Fiz. 61, 1562 (1998) (in Russian).
  8. I.N. Vishnevskii, O.I. Davydovskaya, V.A. Zheltonozhskyi, A.N. Savrasov. Research of 232Th and 238U photofission. Izv. Ross. Akad. Nauk Ser. Fiz. 73, 782 (2009) (in Russian).
  9. I.M. Vyshnevskyi, V.O. Zheltonozhskii, A.M. Savrasov, E.P. Rovenskykh, V.A. Plujko, O.I. Davydovska, O.M. Gorbachenko. Isomer yield ratios of 133Te, 134I, 135Xe in photofission of 235U with 17 MeV bremsstrahlung. Yad. Fiz. Energet. 15, 111 (2014) (in Ukrainian).
  10. I.M. Vyshnevskyi, V.O.Zheltonozhskyi, V.A. Plujko, A.M. Savrasov, O.M. Gorbachenko, O.I. Davydovska, E.P. Rovenskykh. Isomeric yield ratios and mean angular momenta of 235U, 237Np, and 239Pu photofission fragments. Yad. Fiz. Energet. 16, 5 (2015) (in Ukrainian).
  11. I.N. Vishnevskii, V.A. Zheltonozhskii, A.N. Savrasov, V.P. Khomenkov, V.A. Plujko, E.P. Rovenskykh. Measurement of isomeric ratios in 235U, 237Np, and 239Pu photofission. Vopr. At. Nauki Tekhn. Ser. Fiz. Yad. Reakt. 1, 79(2015) (in Russian).
  12. V.P. Khomenkov. Ph.D. thesis Investigation of AtomicNuclear Effects in the Process of Gamma-Ray Internal Conversion (Institute for Nuclear Research, Kyiv, (2003) (in Ukrainian).
  13. R.B. Firestone, V.S. Shirley, C.M. Baglin. Table of Isotopes (Wiley, 1996).
  14. H. Naik, G.N. Kim, R. Schwengner, K. Kim, M. Zaman, S.C. Yang, S.G. Shin, Y.-U. Kye, R. Massarczyk, R. John, A. Junghans, A. Wagner, A. Goswami, M.-H. Cho. Measurement of isomeric ratios for 89, Zr, 91, Mo, and 97, Nb in the bremsstrahlung end-point energies of 16 and 45–70 MeV. Eur. Phys. J. A 52, 47 (2016).
  15. H. Warhalek, R. Vandenbosh. Relative cross-sections for formation of the shielded isomeric pair 134 Cs and 134Cs in medium energy fission. J. Inorg. Nucl. Chem. 26, 669 (1964).
  16. M. Herman, R. Capote, B.V. Carlson, P. Obloˇzinsk´y, M. Sin, A. Trkov, H. Wienke, V. Zerkin. EMPIRE: Nuclear reaction model code system for data evaluation. Nucl. Data Sheets 108, 2655 (2007); http://www.nndc.bnl.gov/empire/.
  17. A.J. Koning, S. Hilaire, M.C. Duijvestijn. TALYS-1.0. In Proceedings of the International Conference on Nuclear Data for Science and Technology, 22–27 May, 2007, Nice, France (EDP Sciences, 2008), p. 211; http://www.talys.eu/.
  18. R. Capote, M. Herman, P. Obloˇzinsk’y, P.G. Young, S. Goriely, T. Belgya, A.V. Ignatyuk, A.J. Koning, S. Hilaire, V.A. Plujko, M. Avrigeanu, O. Bersillon, M.B. Chadwick, T. Fukahori, Zhigang Ge, Yinlu Han, S. Kailas, J. Kopecky, V.M. Maslov, G. Reffo, M. Sin, E.Sh. Soukhovitskii, P. Talou. RIPL – Reference input parameter library for calculation of nuclear reactions and nuclear data evaluations. Nucl. Data Sheets 110, 3107 (2009); http://wwwnds.iaea.org/RIPL-3/.
  19. V.A. Plujko, R. Capote, O.M. Gorbachenko. Giant dipole resonance parameters with uncertainties from photonuclear cross sections. At. Data Nucl. Data Tabl. 97, 567 (2011).
  20. V.A. Plujko, O.M. Gorbachenko, E.P. Rovenskykh, V.A. Zheltonozhskii. Average description of dipole gamma transitions in hot atomic nuclei. Nucl. Data Sheets 118, 237 (2014).