Astronomy Letters

, Volume 34, Issue 3, pp 189–197 | Cite as

The r-Process in the region of transuranium elements and the contribution of fission products to the nucleosynthesis of nuclei with A ≤ 130

  • I. V. Panov
  • I. Yu. Korneev
  • F. -K. Thielemann


We discuss the influence of nuclear masses and mass distributions of fission products on the formation of heavy elements at the final stages of the r-process recycled through fission on long duration timescales. The fission recycling is of great importance in an environment with a high density of free neutrons (e.g., in neutron star merger scenarios), when the r-process duration is long enough for most of the seed nuclei to be transformed into actinoids. The fission products of transuranium elements are again drawn into the r-process to produce the abundance curve beyond the iron peak. In this case, to explain the abundances of the A ∼ 130 peak elements, not only the nuclear masses, fission barriers, and reaction rates, but also the fission product mass distribution must be predicted. Our r-process calculations using new nuclear masses and fission barriers and reaction rates based on them have shown that the simple two-fission-fragment model used previously in r-process calculations cannot describe adequately the position of the second peak in the observed abundance curve. We show that agreement between calculations and observations can be achieved only when we properly consider the mass distribution of fission products by taking into account the emission of instantaneous fission neutrons.

Key words

nuclear astrophysics, nucleosynthesis supernovae and supernova remnants nuclear reactions, β-decay and fission 

PACS numbers

26.30.+k 97.60.Bw 97.60.Jd 26.50.tx 


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  1. 1.
    J. Benlliure, A. Grewe, M. de Jong, et al., Nucl. Phys. A 628, 458 (1998).ADSCrossRefGoogle Scholar
  2. 2.
    O. V. Bespalova, I. N. Boboshin, V. V. Varlamov, et al., Yad. Fiz. 68, 216 (2005) [Phys. At. Nucl. 68, 191 (2005)].Google Scholar
  3. 3.
    G. R. Burbidge, E. M. Burbidge, W. A. Fowler, and F. Hoyle, Rev. Mod. Phys. 29, 547 (1957).ADSCrossRefGoogle Scholar
  4. 4.
    M. B. Chadwick, P. Obložinský, M. Herman, et al., Nucl. Data Sheets 107, 2931 (2006).ADSCrossRefGoogle Scholar
  5. 5.
    J. J. Cowan, F.-K. Thielemann, and J. W. Truran, Phys. Rep. 208, 267 (1991).ADSCrossRefGoogle Scholar
  6. 6.
    J. J. Cowan, A. McWilliam, C. Sneden, and D. L. Burris, Astrophys. J. 480, 246 (1997).ADSCrossRefGoogle Scholar
  7. 7.
    R. I. Epstein, S. A. Colgate, and W. C. Haxton, Phys. Rev. Lett. 61, 2038 (1988).Google Scholar
  8. 8.
    C. Freiburghaus, S. Rosswog, and F.-K. Thielemann, Astrophys. J. 525, L121 (1999a).ADSCrossRefGoogle Scholar
  9. 9.
    C. Freiburghaus, J.-F. Rembges, T. Rauscher, et al., Astrophys. J. 516, 381 (1999b).ADSCrossRefGoogle Scholar
  10. 10.
    G. N. Goncharov, in Proceedings of the International Symposium on Nuclear Astrophysics “Nuclei in the Cosmos-IX,” 2006, Proc. Sci., PoS (NICIX), p. 156.Google Scholar
  11. 11.
    I. Halpern, Nuclear Fission (Fizmatgiz, Moscow, 1962) [in Russian].sGoogle Scholar
  12. 12.
    E. R. Hilf, H. V. Groote, and K. Takahashi, in Proceedings of the 3rd International Conference on Nuclear far from Stability (CERN-76-13, 1976), p. 142.Google Scholar
  13. 13.
    W. Hillebrandt and F.-K. Thielemann, Astron. Astrophys. 58, 357 (1977).ADSGoogle Scholar
  14. 14.
    W. M. Howard and P. Möller, At. Data Nucl. Data Tables 25, 219 (1980).ADSCrossRefGoogle Scholar
  15. 15.
    M. G. Itkis, V. N. Okolovich, and G. N. Smirenkin, Nucl. Phys. A 502, 243 (1989).ADSCrossRefGoogle Scholar
  16. 16.
    F. Käppeler, H. Beer, and K. Wisshak, Rep. Progr. Phys. 52, 945 (1989).ADSCrossRefGoogle Scholar
  17. 17.
    A. Kelić, N. Zinner, E. Kolbe, et al., Phys. Lett. B 616, 48 (2005).ADSCrossRefGoogle Scholar
  18. 18.
    N. V. Kornilov, A. B. Kagalenko, B. M. Maslov, and Yu.V. Porodzinskij, Preprint IPPE-2978 (IPPE, Obninsk, 2003).Google Scholar
  19. 19.
    K.-L. Kratz, J.-P. Bitouzet, F.-K. Thielemann, et al., Astrophys. J. 403, 216 (1993).ADSCrossRefGoogle Scholar
  20. 20.
    B. D. Kuzminov, A. I. Sergachev, Khryachkov, et al., Neĭtron. Konstanty Parametry 2, 2 (2001).Google Scholar
  21. 21.
    J. M. Lattimer and D. N. Schramm, Astrophys. J. 192, L145 (1974).ADSCrossRefGoogle Scholar
  22. 22.
    Yu. S. Lyutosansky, I. V. Panov, O. N. Sinyukova, et al., Yad. Fiz. 44, 66 (1986) [Sov. J. Nucl. Phys. 44, 43 (1986)].Google Scholar
  23. 23.
    Yu. S. Lyutosansky, D. A. Ptitsyn, O. N. Sinyukova, et al., Yad. Fiz. 42, 215 (1985) [Sov. J. Nucl. Phys. 42, 136 (1985)].Google Scholar
  24. 24.
    Yu. S. Lyutosansky, I. V. Panov, V. I. Lyashuk, Izv. Akad. NAuk SSSR, Ser. Fiz. 54, 2137 (1990).Google Scholar
  25. 25.
    A. Mamdouh, J. M. Pearson, M. Rayet, and F. Tondeur, Nucl. Phys. A 679, 337 (2001).ADSCrossRefGoogle Scholar
  26. 26.
    G. J. Mathews and J. J. Cowan, Nature 345, 491 (1990).ADSCrossRefGoogle Scholar
  27. 27.
    P. Möller, J. R. Nix, and K.-L. Kratz, Atomic Data Nucl. Data Tables 66, 131 (1997).ADSCrossRefGoogle Scholar
  28. 28.
    W. D. Myers and W. J. Swiatecki, Phys. Rev. C 60, 014606 (1999).ADSCrossRefGoogle Scholar
  29. 29.
    S. Nagy, K. F. Flynn, J. E. Gindler, et al., Phys. Rev. C 17 (1978).Google Scholar
  30. 30.
    D. K. Nadyozhin and I. V. Panov, Pis’ma Astron. Zh. 33, 435 (2007) [Astron. Lett. 33, 385 (2007)].Google Scholar
  31. 31.
    D. K. Nadyozhin, I. V. Panov, and S. I. Blinnikov, Astron. Astrophys. 335, 207 (1998).ADSGoogle Scholar
  32. 32.
    R. C. Nayk, Phys. Rev. C 60, 064305 (1999).ADSCrossRefGoogle Scholar
  33. 33.
    J. O. Newton, Fiz. Élem. Chastits At. Yadra 21, 822 (1990) [Phys. Part. Nucl. 21, 394 (1990)].Google Scholar
  34. 34.
    I. V. Panov, Astron. Lett. 29, 163 (2003).ADSCrossRefGoogle Scholar
  35. 35.
    I. V. Panov, S. I. Blinnikov, and F.-K. Thielemann, Pis’ma Astron. Zh. 27, 248 (2001a) [Astron. Lett. 27, 239 (2001a)].Google Scholar
  36. 36.
    I. V. Panov and V.M. Chechetkin, Pis’ma Astron. Zh. 28, 541 (2002) [Astron. Lett. 28, 476 (2002)].Google Scholar
  37. 37.
    I. V. Panov, C. Freiburghaus, and F.-K. Thielemann, Nucl. Phys. A 688, 587 (2001b).ADSCrossRefGoogle Scholar
  38. 38.
    I. V. Panov, C. Freiburghaus, and F.-K. Thielemann, in Workshop on Nuclear Astrophysics, Ed. by W. Hillebrandt and E. Müller (MPA, Ringberg, Garching, 2000), p. 73.Google Scholar
  39. 39.
    I. V. Panov, E. Kolbe, B. Pfeiffer, et al., Nucl. Phys. A 747, 633 (2005).ADSCrossRefGoogle Scholar
  40. 40.
    I. V. Panov and F.-K. Thielemann, Nucl. Phys. A 718, 647 (2003).ADSCrossRefGoogle Scholar
  41. 41.
    D. A. Ptitsyn and V. M. Chechetkin, Pis’ma Astron. Zh. 8, 600 (1982) [Astron. Lett. 8, 322 (1982)].ADSGoogle Scholar
  42. 42.
    Y.-Z. Qian, Astrophys. J. 563, L103 (2002).ADSCrossRefGoogle Scholar
  43. 43.
    Y.-Z. Qian and G. J. Wasserburg, Phys. Rep. 333, 77 (2000).ADSCrossRefGoogle Scholar
  44. 44.
    T. Rauscher and F.-K. Thielemann, At. Data Nucl. Data Tables 75, 1 (2000).ADSCrossRefGoogle Scholar
  45. 45.
    P.A. Seeger, W. A. Fowler, and D.D. Clayton, Astrophys. J., Suppl. Ser. 11, 121 (1965).ADSCrossRefGoogle Scholar
  46. 46.
    J. Simmerer and C. Sneden, Astrophys. J. 617, 1091 (2004).ADSCrossRefGoogle Scholar
  47. 47.
    C. Sneden, J. J. Cowan, I. I. Ivans, et al., Astrophys. J. 533, 139 (2000).ADSCrossRefGoogle Scholar
  48. 48.
    E. M. D. Symbalisty and D. N. Schramm, Astrophys. Lett. 22, 143 (1982).ADSGoogle Scholar
  49. 49.
    F.-K. Thielemann, M. Arnould, and W. Truran, Advances in Nuclear Astrophysics, Ed. by E. Vangioni-Flam et al. (Frontiers, Gif sur Yvette, 1987), p. 525.Google Scholar
  50. 50.
    J.W. Truran and J. J. Cowan, Workshop on Nuclear Astrophysics, Ed. by W. Hillebrandt and E. Müller (MPA, Ringberg, Garching, 2000), p. 64.Google Scholar
  51. 51.
    J. W. Truran, J. J. Cowan, and A. G. W. Cameron, Astrophys. J. 22, L63 (1978).ADSCrossRefGoogle Scholar
  52. 52.
    A. A. Vorob’ev, I. T. Grachev, I. A. Kondurov, et al., Fiz. Élem. Chastits At. Yadra 26, 939 (1972).Google Scholar
  53. 53.
    G. J. Wasserburg, M. Busso, and R. Gallino, Astrophys. J. 466, L109 (1996).ADSCrossRefGoogle Scholar
  54. 54.
    J. Witti, H.-Th. Janka, K. Takahashi, and W. Hillebrandt, Nuclei in the Cosmos Ed. by F. Käppeler, K. Wisshak (Inst. of Phys. Publ., Bristol, 1993), p. 601.Google Scholar
  55. 55.
    S. E. Woosley, J. R. Wilson, G. J. Mathews, et al., Astrophys. J. 433, 229 (1994).ADSCrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  • I. V. Panov
    • 1
  • I. Yu. Korneev
    • 1
  • F. -K. Thielemann
    • 2
  1. 1.Alikhanov Institute for Theoretical and Experimental PhysicsMoscowRussia
  2. 2.University of BaselBaselSwitzerland

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