Nuclear Physics and Atomic Energy

ядерна ф≥зика 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, Russian
  Periodicity: 4 times per year

  Open access peer reviewed journal

 Home page   About 
Nucl. Phys. At. Energy 2015, volume 16, issue 1, pages 5-14.
Section: Nuclear Physics.
Received: 22.01.2015; Accepted: 19.03.2015; Published online: 20.04.2015.
PDF Full Text (ru)

Isomeric yield ratios and mean angular momenta of photofission fragments of 235U, 237Np and 239Pu

I.M. Vyshnevskyi1, V.O. Zheltonozhskyi1, V.A. Plujko2, A.M. Savrasov1,*, O.M. Gorbachenko2, O.I. Davydovska1, E.P. Rovenskykh2

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

*Corresponding author. E-mail address:

Abstract: Isomeric yield ratios for the fragments of photofission of 235U, 237Np and 239Pu by bremsstrahlung with end-point energy of 18 MeV are measured. New data for isomeric yield ratios of the fragments 84Se, 90Br, 131Te, 132Sb, 132I, 133Te, 134I, 135Xe are determined. The contributions to the isomeric yield ratios from β-decay of the nuclei of parent isobaric chains were removed. Mean angular momenta of studied nuclei are estimated within the framework of an extended Huizenga-Vandenbosh statistical model with using EMPIRE 3.2 code.

Keywords: photofission, isomeric ratios method, average angular momenta of fission products.


1. R. Vandenbosch, J.R. Huizenga. Nuclear Fission (Academic Press, 1973) 422 p. Google Books

2. C. Wagemans (ed.). The Nuclear Fission Process (CRC Press, Boca Raton (EL), USA, 1995) 475 p. Google Books

3. I. Ahmad, W.R. Philips. Gamma rays from fission fragments. Rep. Prog. Phys. 58 (1995) 1415 - 1463.

4. G.M. Ter-Akopyan, Yu.Ts. Oganesyan, V.A. Daniel' et al. Experimental Methods for the Study of Spontaneous and Low-Energy Nuclear Fission. Phys. Elementary Part. At. Nucl. 28 (1997) 1357 - 1388. (Rus)

5. V.Yu. Denisov, S.V. Reshitko. Mean angular momentum of nuclear-fission fragments. Phys. At. Nucl. 62 (1999) 1806 - 1814.

6. I.N. Mikhailov, P. Quentin, Ch. Briancon. Angular momentum of fission fragments. Phys. At. Nucl. 64 (2001) 1185 - 1191.

7. I.N. Vishnevskij, O.I. Davidovskaya, V.A. Zheltonozhskij, A.N. Savrasov. Investigation of the 232Th and 238U photofission. Bull. Rus. Ac. Sci: Physics 73(6) (2009) 733 - 736. (Rus)

8. O.A. Besshejko, I.N. Vishnevskij, V.A. Zheltonozhskij et al. Izv. RAN. Ser. fiz. 69(5) (2005) 658 - 662. (Rus)

9. I.M. Vyshnevsky, V.O. Zheltonozhskii, A.M. Savrasov et al. Isomer yield ratios of 133Te, 134I, 135Xe in photofission of 235U with 17 MeV bremsstrahlung. Nucl. Phys. At. Energy 15(2) (2014) 111 - 118.

10. 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. C 16 (1977) 254 - 265.

11. E. Jacobs, H. Thierens, D. De Frenne et al. Product yields for the photofission of 238U with 12-, 15-, 20-, 30-, and 70-MeV bremsstrahlung. Phys. Rev. C 19 (1979) 422 - 432.

12. G.P. Ford, K. Wolfsberg, B.R. Erdal. Independent yie1ds of the isomers of 133Xe and 135Xe for neutron-induced fission of 233U, 235U, 238U, 239Pu, and 242Am. Phys. Rev. C 30 (1984) 195 - 213.

13. I.N. Vishnevsky, V.Yu. Denisov, V.A. Zheltonozhsky et al. Mean angular momenta of fragments from 232Th fission. Phys. At. Nucl. 61 (1998) 1452 - 1458.

14. V.P. Khomenkov. Atomic-nuclear effects research in the process of internal conversion of gamma rays: Ph. D. Thesis, abstract (Kyiv, 2003) 19 p. (Rus)

15. I.N. Vishnevskij, O.I. Davidovskaya, V.A. Zheltonozhskij, A.N. Savrasov. Investigation of 235U and 239Pu photofission. Bull. Rus. Ac. Sci.: Physics 74(4) (2010) 500 - 503. (Rus)

16. J.R. Huizenga, R. Vandenbosh. Interpretation of Isomeric Cross-Section Ratios for (n,γ) and (γ,n) Reactions. Phys. Rev. 120 (1960) 1305 - 1312.

17. R. Vandenbosh, J.R. Huizenga. Isomeric Cross-Section Ratios for Reactions Producing the Isomeric Pair Hg197,197m. Phys. Rev. 120 (1960) 1313 - 1318.

18. H. Warhalek, R. Vandenbosh. Relative cross-sections for formation of the shielded isomeric pair 134mCs and 134Cs in medium energy fission. J. Inorg. Nucl. Chem. 26 (1964) 669 - 676.

19. R. Capote, M. Herman, P. Oblozinsky et al. RIPL - Reference Input Parameter Library for Calculation of Nuclear Reactions and Nuclear Data Evaluations. Nucl. Data Sheets 110 (2009) 3107 - 3214.

20. M. Herman, R. Capote, B.V. Carlson et al. EMPIRE: Nuclear Reaction Model Code System for Data Evaluation. Nucl. Data Sheets 108 (2007) 2655 - 2716.

21. 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 (2014) 237 - 239.

22. V.A. Plujko, O.M. Gorbachenko, B.M. Bondar, E.P. Rovenskykh. Nuclear level density within extended superfluid model with collective state enhancement. Nucl. Data Sheets 118 (2014) 240 - 243.

23. D.G. Sarantities, G.E. Gordon, Ch.D. Coryell, D. De Frenne et al. Ratios of independent yields of the isomers Te131-131m and Te133-133m in fission. Phys. Rev. 138 (1965) B353 - B364.

24. H. Thierens, D. De Frenne, E. Jacobs et al. Product yields for the photofission of 235U and 238U with 25-MeV bremsstrahlung. Phys. Rev. C 14 (1976) 1058 - 1067.

25. J.M. Alexander, G.N. Simonoff. Excitation functions for Tb149g from reactions between complex nuclei. Phys. Rev. 130 (1963) 2383 - 2387.

26. J. Terrell. Fission Neutron Spectra and Nuclear Temperatures. Phys. Rev. 113 (1959) 527 - 541.

27. D.G. Madland. Theory of neutron emission in fission. Proc. Workshop on Nuclear Reaction Data and Nuclear Reactors, ICTP, Trieste, Italy, 23 Feb. - 27 Mar., 1998, eds. P. Oblozinsky, A. Gandini (Singapore: World Scientific, 1999) p. 46 - 67.

28. K.-H. Schmidt, B. Jurado. Description of the fission probability with the GEF code. JEF/DOC 1423 (OECD-NEA, Paris, 2012) 15 p.

29. M.B. Chadwick, P. Oblozinsky, M. Herman et al. ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology. Nucl. Data Sheets 107 (2006) 2931 - 3060.