Fission and ternary cluster decay of hyper-deformed 56Ni

  • W. von Oertzen
  • B. Gebauer
  • G. Efimov
  • V. Zherebchevsky
  • Tz. Kokalova
  • S. Thummerer
  • Ch. Schulz
  • H. G. Bohlen
  • D. Kamanin
  • C. Beck
  • D. Curien
  • P. Papka
  • M. Rousseau
  • G. Royer
  • G. de Angelis
Regular Article - Experimental Physics

Abstract.

Coincidences between two heavy fragments have been measured from the fission of 56Ni compound nuclei formed in the 32S + 24Mg reaction at E lab( ^32S ) = 165.4 MeV. A unique experimental set-up consisting of two large-area position-sensitive (x, y) gas detector telescopes has been used allowing the complete determination of the observed fragments and their momentum vectors. In addition to binary fission events with subsequent particle evaporation, narrow out-of-plane correlations are observed for two fragments emitted in purely binary events and in events with a missing charge consisting of 2α - and 3α -particles (12C). These events are interpreted as ternary cluster decay from 56Ni nuclei at high angular momenta through hyper-deformed shapes.

PACS.

25.70.Jj Fusion and fusion-fission reactions 25.70.Pq Multifragment emission and correlations 24.60.Dr Statistical compound-nucleus reactions 

References

  1. 1.
    S. Cohen, F. Plasil, W.J. Swiatecki, Ann. Phys. (N.Y.) 82, 557 (1974).CrossRefADSGoogle Scholar
  2. 2.
    J. Zhang, A.C. Merchant, W.D.M. Rae, Phys. Rev. C 49, 562 (1994)CrossRefADSGoogle Scholar
  3. 3.
    G. Leander, S.E. Larsson, Nucl. Phys. A 239, 93 (1975).CrossRefADSGoogle Scholar
  4. 4.
    S. Åberg, H. Flocard, W. Nazarewicz, Annu. Rev. Nucl. Sci. 40, 439 (1990).CrossRefADSGoogle Scholar
  5. 5.
    S. Aberg, L.O. Joensson, Z. Phys. A 349, 205 (1994).CrossRefADSGoogle Scholar
  6. 6.
    I. Ragnarsson, S. Aberg, R.K. Sheline, Phys. Scr. 24, 215 (1981)CrossRefADSGoogle Scholar
  7. 7.
    E. Ideguchi, D.G. Sarantites, W. Reviol, A.V. Afanasjev, M. Devlin, C. Baktash, R.V.F. Janssens, D. Rudolph, A. Axelsson, M.P. Carpenter, A. Galindo-Uribarri, D.R. LaFosse, T. Lauritsen, F. Lerma, C.J. Lister, P. Reiter, D. Seweryniak, M. Weiszflog, J.N. Wilson, Phys. Rev. Lett. 87, 222501 (2001).CrossRefADSGoogle Scholar
  8. 8.
    G. Royer, F. Haddad, J. Phys. G 21, 339 (1995).CrossRefADSGoogle Scholar
  9. 9.
    G. Royer, J. Phys. G 21, 249 (1995)CrossRefADSGoogle Scholar
  10. 10.
    A. Algora, J. Cseh, Phys. Lett. B 639, 451 (2006)CrossRefADSGoogle Scholar
  11. 11.
    V.I. Zherebchevsky, W. von Oertzen, Phys. Lett. 646, 12 (2007).Google Scholar
  12. 12.
    V.I. Zherebchevsky, W. von Oertzen, D.V. Kamanin, JETP Lett. 85, 136 (2007)CrossRefADSGoogle Scholar
  13. 13.
    W. von Oertzen, to be published in Phys. Rev. C.Google Scholar
  14. 14.
    B. Herskind, Acta Phys. Pol. B 38, 14121 (2007).Google Scholar
  15. 15.
    R. Betts, Phys. Rev. Lett. 47, 23 (1981).CrossRefADSGoogle Scholar
  16. 16.
    S.J. Sanders, A. Szanto de Toledo, C. Beck, Phys. Rep. 311, 487 (1999) and references therein.CrossRefADSGoogle Scholar
  17. 17.
    C. Beck, A. Szanto de Toledo, Phys. Rev. C 53, 1989 (1996).CrossRefADSGoogle Scholar
  18. 18.
    B. Gebauer, in Proceedings of the International Conference on the Future of Nuclear Spectroscopy, Crete, Greece, 1993, edited by W. Gelletly (Institute of Nuclear Physics, NCSR Demokritos, Athens, 1994) p. 168.Google Scholar
  19. 19.
    B. Gebauer, Achievements with the Euroball spectrometer, Scientific and Technical Report 1997-2003, edited by W. Korten, S. Lunardi (2003) p. 135, available on-line at LNL, INFN (2003).Google Scholar
  20. 20.
    C. Beck, Nucl. Phys. A 734, 453 (2004).CrossRefADSGoogle Scholar
  21. 21.
    C. Wheldon , submitted to Nucl. Phys. A.Google Scholar
  22. 22.
    S. Thummerer, Nuovo Cimento A 111, 1077 (1998). ADSCrossRefGoogle Scholar
  23. 23.
    T. Matsuse, C. Beck, R. Nouicer, D. Mahboub, Phys. Rev. C 55, 1380 (1997).CrossRefADSGoogle Scholar
  24. 24.
    H. Morgenstern, Z. Phys. A 313, 39 (1983).CrossRefGoogle Scholar
  25. 25.
    G. Efimov, PhD Thesis, Dubna University, 2008.Google Scholar
  26. 26.
    A.V. Andreev, Eur. Phys. J. A 30, 579 (2006).CrossRefADSGoogle Scholar
  27. 27.
    C. Beck , Phys. Rev. C 63, 014607 (2001).CrossRefADSGoogle Scholar
  28. 28.
    H.J. Wiebecke, M. Zhukov, Nucl. Phys. A 351, 321 (1981).CrossRefADSGoogle Scholar
  29. 29.
    H. Horiuchi, Nucl. Phys. A 731, 329 (2004).CrossRefADSGoogle Scholar

Copyright information

© Società Italiana di Fisica and Springer-Verlag 2008

Authors and Affiliations

  • W. von Oertzen
    • 1
  • B. Gebauer
    • 1
  • G. Efimov
    • 1
    • 2
  • V. Zherebchevsky
    • 1
    • 6
  • Tz. Kokalova
    • 1
  • S. Thummerer
    • 1
  • Ch. Schulz
    • 1
  • H. G. Bohlen
    • 1
  • D. Kamanin
    • 1
    • 2
  • C. Beck
    • 3
  • D. Curien
    • 3
  • P. Papka
    • 3
  • M. Rousseau
    • 3
  • G. Royer
    • 4
  • G. de Angelis
    • 5
  1. 1.Hahn-Meitner-Institut-GmbHBerlinGermany
  2. 2.Flerov Laboratory for Nuclear Reactions, JNRDubnaRussia
  3. 3.IPHC, Département de Recherches Subatomiques, IN2P3-CNRS, UMR7178Université Louis PasteurStrasbourgFrance
  4. 4.Subatech, UMRUniversité-IN2P3/CNRS-Ecole des MinesNantesFrance
  5. 5.Laboratori Nationali di LegnaroLegnaroItaly
  6. 6.St. Petersburg UniversitySt. PetersburgRussia

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