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Strong enhancement of two-neutron transfer in the system 206Pb+118Sn

  • I. Peter
  • W. von Oertzen
  • H.G. Bohlen
  • A. Gadea
  • B. Gebauer
  • J. Gerl
  • M. Kaspar
  • I. Kozhoukharov
  • T. Kröll
  • M. Rejmund
  • C. Schlegel
  • S. Thummerer
  • H.J. Wollersheim
Short notes

Abstract:

One and two neutron transfer has been measured in the heaviest asymmetric nuclear system with semi magic nuclei showing superfluid properties, in 206Pb+118Sn collisions at an energy well below the Coulomb barrier with scattering orbits covering the largest angles. Particle-γ coincidence techniques using 5 Euroball-Cluster detectors (EB) combined in a set-up with the Heidelberg-Darmstadt NaI-Crystal Ball (CB) have been used. Transfer channels are identified with EB via their known γ-decays of the lowest excited states. Using the unique feature of the set-up with the CB, transfer to well defined final states with known quantum numbers (without feeding) are selected using the high efficiency multiplicity filter of the CB (no second γ-ray). The data are analysed using the semiclassical approach and transfer probabilities are obtained. The enhancement for the two-neutron transfer populating the low lying superfluid 2+ state in 120Sn (and 116Sn), while the Pb-branch is in the groundstate is deduced by comparison with the strongest single neutron transfer transition. Large enhancements (EF ≃ 103) are observed. This is the first direct measurement of enhancement for a heavy nuclear binary system with experimentally separated levels suggesting a strong contribution from superfluid pair transfer.

PACS: 25.70.Hi Transfer reactions 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • I. Peter
    • 1
  • W. von Oertzen
    • 1
  • H.G. Bohlen
    • 2
  • A. Gadea
    • 3
  • B. Gebauer
    • 2
  • J. Gerl
    • 3
  • M. Kaspar
    • 3
  • I. Kozhoukharov
    • 3
  • T. Kröll
    • 3
  • M. Rejmund
    • 3
  • C. Schlegel
    • 3
  • S. Thummerer
    • 2
  • H.J. Wollersheim
    • 3
  1. 1.Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, D-14195 Berlin, GermanyDE
  2. 2.Hahn-Meitner-Institut Berlin, Glienicker Strasse 100, D-14109 Berlin, GermanyDE
  3. 3.Gesellschaft für Schwerionenforschung Darmstadt, Planckstrasse 1, D-64291 Darmstadt, GermanyDE

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