The European Physical Journal A

, Volume 43, Issue 2, pp 175–180 | Cite as

Alpha-decay properties of 261Bh

  • F. P. Heßberger
  • S. Antalic
  • D. Ackermann
  • S. Heinz
  • S. Hofmann
  • J. Khuyagbaatar
  • B. Kindler
  • I. Kojouharov
  • B. Lommel
  • R. Mann
Regular Article - Experimental Physics

Abstract

The isotope 261Bh was produced in the reaction 209Bi(54Cr, 2n)261Bh and its \( \alpha\) decay has been remeasured. It was found that it populates by an unhindered transition of \( \approx\) 10 MeV an excited level at E * > 350 keV in the daughter nucleus 257Db . The latter decays by internal transitions either into the isomeric state or the ground state. A somewhat improved half-life value of T 1/2 = 11.8+3.9 -2.4 ms was obtained for 261Bh . The data support the previous assignment of the \( \alpha\) activities 257Db (1) and 257Db (2) to the isomer and to the ground state, respectively. No evidence for an isomeric state in 261Bh decaying by \( \alpha\) emission was found. Based on the experimental results and theoretical calculations a partial decay scheme of 261Bh including spin and parity assignments of the ground-state and excited levels in the daughter nucleus 257Db populated by the \( \alpha\) decay and succeeding internal transitions have been suggested. 261Bh represents so far the heaviest nucleus for which such an attempt has been made. No spontaneous fission (SF) events that could be attributed to 261Bh were observed, resulting in an SF branching b SF < 0.05 . The measured production cross-section is (64±15) pb at E * = 22 MeV.

Keywords

Internal Transition Conversion Electron Isomeric State Spontaneous Fission Hindrance Factor 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    G. Münzenberg, P. Armbruster, S. Hofmann, F.P. Heßberger, H. Folger, J.G. Keller, V. Ninov, K. Poppensieker, A.B. Quint, W. Reisdorf, K.-H. Schmidt, J.R.H. Schneider, H.J. Schött, K. Sümmerer, I. Zychor, M.E. Leino, D. Ackermann, U. Gollerthan, E. Hanelt, W. Morawek, D. Vermeulen, Y. Fujita, T. Schwab, Z. Phys. A 333, 163 (1989)Google Scholar
  2. 2.
    F.P. Heßberger, S. Hofmann, D. Ackermann, V. Ninov, M. Leino, G. Münzenberg, S. Saro, A. Lavrentev, A.V. Yeremin, Ch. Stodel, Eur. Phys. J. A 12, 57 (2001)CrossRefADSGoogle Scholar
  3. 3.
    F.P. Heßberger, S. Hofmann, B. Streicher, B. Sulignano, S. Antalic, D. Ackermann, S. Heinz, B. Kindler, I. Kojouharov, P. Kuusiniemi, M. Leino, B. Lommel, R. Mann, A.G. Popeko, S. Saro, J. Uusitalo, A.V. Yeremin, Eur. Phys. J. A 41, 145 (2009)CrossRefADSGoogle Scholar
  4. 4.
    S. Cwiok, S. Hofmann, W. Nazarewicz, Nucl. Phys. A 573, 356 (1994)CrossRefADSGoogle Scholar
  5. 5.
    A. Parkhomenko, A. Sobiczewski, Acta Phys. Pol. B 35, 2447 (2004)ADSGoogle Scholar
  6. 6.
    A. Parkhomenko, A. Sobiczewski, Acta Phys. Pol. B 36, 3115 (2005)ADSGoogle Scholar
  7. 7.
    R.-D. Herzberg, P.T. Greenlees, Prog. Part. Nucl. Phys. 61, 674 (2008)CrossRefADSGoogle Scholar
  8. 8.
    C.M. Folden III, S.L. Nelson, Ch.E. Düllmann, J.M. Schwantes, R. Sudowne, P.M. Zielinski, K.E. Gregorich, H. Nitsche, D.C. Hoffman, Phys. Rev. C 73, 014611 (2006)CrossRefADSGoogle Scholar
  9. 9.
    S.L. Nelson, C.M. Folden III, K.E. Gregorich, I. Dragojevic, Ch.E. Düllmann, R. Eichler, M.A. Garcia, J.M. Gates, R. Sudowne, H. Nitsche, Phys. Rev. C 78, 024606 (2008)CrossRefADSGoogle Scholar
  10. 10.
    G. Münzenberg, W. Faust, S. Hofmann, P. Armbruster, K. Güttner, H. Ewald, Nucl. Instrum. Methods 161, 65 (1979)CrossRefGoogle Scholar
  11. 11.
    S. Hofmann, G. Münzenberg, Rev. Mod. Phys. 72, 733 (2000)CrossRefADSGoogle Scholar
  12. 12.
    F.P. Heßberger, S. Hofmann, D. Ackermann, P. Cagarda, R.-D. Herzberg, I. Kojouharov, P. Kuusiniemi, M. Leino, R. Mann, Eur. Phys. J. A 22, 417 (2004)CrossRefADSGoogle Scholar
  13. 13.
    F.P. Heßberger, S. Hofmann, D. Ackermann, S. Antalic, B. Kindler, I. Kojouharov, P. Kuusiniemi, M. Leino, B. Lommel, R. Mann, K. Nishio, A.G. Popeko, B. Sulignano, S. Saro, B. Streicher, M. Venhart, A.V. Yeremin, Eur. Phys. J. A 30, 561 (2006)CrossRefADSGoogle Scholar
  14. 14.
    D.N. Poenaru, M. Ivanscu, M. Mazila, J. Phys. (Paris) Lett. 41, 589 (1980)Google Scholar
  15. 15.
    E. Rurarz, Acta Phys. Pol. B 14, 917 (1983)Google Scholar
  16. 16.
    W. Reisdorf, Z. Phys. A 300, 227 (1981)CrossRefGoogle Scholar
  17. 17.
    G.T. Seaborg, W.D. Loveland, The Elements Beyond Uranium (J. Wiley & Sons, New York, Chichester, Brisbane, Toronto, Singapore, 1990)Google Scholar
  18. 18.
    T. Kibeti, T.W. Burrows, M.B. Trzhaskovskaya, P.M. Davidson, C.W. Nestor jr., Nucl. Instrum. Methods A 589, 202 (2008)CrossRefADSGoogle Scholar
  19. 19.
    L.-L. Andersson, D. Rudolph, P. Golubev, R. Hoischen, E. Merchan, D. Ackermann, Ch.E. Düllmann, J. Gerl, F.P. Heßberger, E. Jäger, J. Khuyagbaatar, I. Kojouharov, J. Krier, N. Kurz, W. Prokopowicz, M. Schädel, H. Schaffner, B. Schausten, E. Schimpf, A. Semchenko, H.-J. Wollersheim, A. Türler, A. Yakushev, K. Eberhardt, J. Even, J.V. Kratz, P. Thörle-Pospiech, GSI Scientific Report 2008 (GSI Report 2009-1) (2009) p. 142Google Scholar
  20. 20.
    Yu. Oganessian, J. Phys. G: Nucl. Part. Phys. 34, R165 (2007)CrossRefADSGoogle Scholar

Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • F. P. Heßberger
    • 1
  • S. Antalic
    • 2
  • D. Ackermann
    • 1
  • S. Heinz
    • 1
  • S. Hofmann
    • 1
    • 3
  • J. Khuyagbaatar
    • 1
  • B. Kindler
    • 1
  • I. Kojouharov
    • 1
  • B. Lommel
    • 1
  • R. Mann
    • 1
  1. 1.GSIHelmholtzzentrum für Schwerionenforschung GmbHDarmstadtGermany
  2. 2.Department of Nuclear Physics and BiophysicsComenius University BratislavaBratislavaSlovakia
  3. 3.Institut für PhysikGoethe-Universität FrankfurtFrankfurtGermany

Personalised recommendations