Unexpected Behavior of Heavy-Ion Fusion Cross Sections at Extreme Sub-Barrier Energies

Phys. Rev. Lett. 89, 052701 – Published 11 July 2002
C. L. Jiang, H. Esbensen, K. E. Rehm, B. B. Back, R. V. F. Janssens, J. A. Caggiano, P. Collon, J. Greene, A. M. Heinz, D. J. Henderson, I. Nishinaka, T. O. Pennington, and D. Seweryniak

Abstract

The excitation function for fusion evaporation in the  ︀60Ni+ ︀89Y system was measured over a range in cross section covering 6 orders of magnitude. The cross section exhibits an abrupt decrease at extreme sub-barrier energies. This behavior, which is also present in a few other systems found in the literature, cannot be reproduced with present models, including those based on a coupled-channels approach. Possible causes are discussed, including a dependence on the intrinsic structure of the participants.

DOI: http://dx.doi.org/10.1103/PhysRevLett.89.052701

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  • Received 9 January 2002
  • Published 11 July 2002

© 2002 The American Physical Society

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