Unexpected Behavior of Heavy-Ion Fusion Cross Sections at Extreme Sub-Barrier Energies
C. L. JiangPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439, USAH. EsbensenPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439K. E. RehmPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439B. B. BackPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439R. V. F. JanssensPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439J. A. CaggianoPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439P. CollonPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439J. P. GreenePhysics Division, Argonne National Laboratory, Argonne, Illinois 60439A. HeinzPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439D. HendersonPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439I. NishinakaPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439T. PenningtonPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439D. SeweryniakPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439
2002en
ABI
Annotatsiya
The excitation function for fusion evaporation in the (60)Ni+ (89)Y 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.
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