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Enhanced fusion-evaporation cross sections in neutron-rich [formula presented] on [formula presented]

  • J. F. Liangc(Author)
    ,
  • D. Shapirac(Author)
    ,
  • C. J. Grossc(Author)
    ,
  • J. R. Beenec(Author)
    ,
  • J. D. Biermana(Author)
    ,
  • A. Galindo-Uribarric(Author)
  • ,
  • bUniversity of Tennessee
    ,
  • cOak Ridge National Laboratory
    ,
  • dOregon State University
Research Output: Contribution to journal Article Peer-review

Abstract

Evaporation residue cross sections have been measured with neutron-rich radioactive [Formula presented] beams on [Formula presented] in the vicinity of the Coulomb barrier. The average beam intensity was [Formula presented] particles per second and the smallest cross section measured was less than 5 mb. Large sub-barrier fusion enhancement was observed. Coupled-channel calculations taking into account inelastic excitation significantly underpredict the measured cross sections below the barrier. The presence of several neutron transfer channels with large positive [Formula presented] values suggests that multinucleon transfer may play an important role in enhancing the fusion of [Formula presented] and [Formula presented].