Regular Article - Experimental Physics

The European Physical Journal A

, 49:63

Fusion of 60Ni + 100Mo near and below the Coulomb barrier

Multi-phonon and transfer couplings down to the hindrance region
  • A. M. StefaniniAffiliated withLaboratori Nazionali di Legnaro, INFN Email author 
  • , G. MontagnoliAffiliated withDipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova
  • , F. ScarlassaraAffiliated withDipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova
  • , C. L. JiangAffiliated withPhysics Division, Argonne National Laboratory
  • , H. EsbensenAffiliated withPhysics Division, Argonne National Laboratory
  • , E. FiorettoAffiliated withLaboratori Nazionali di Legnaro, INFN
  • , L. CorradiAffiliated withLaboratori Nazionali di Legnaro, INFN
  • , B. B. BackAffiliated withPhysics Division, Argonne National Laboratory
  • , C. M. DeibelAffiliated withPhysics Division, Argonne National LaboratoryDepartment of Physics and Astronomy, Louisiana State University
    • , B. Di GiovineAffiliated withPhysics Division, Argonne National Laboratory
    • , J. P. GreeneAffiliated withPhysics Division, Argonne National Laboratory
    • , H. D. HendersonAffiliated withPhysics Division, Argonne National Laboratory
    • , S. T. MarleyAffiliated withPhysics Division, Argonne National LaboratoryUniversity of Notre Dame
    • , M. NotaniAffiliated withUniversity of Notre DameFermi National Accelerator Laboratory
    • , N. PatelAffiliated withPhysics Division, Argonne National LaboratoryLawrence Livermore National Laboratory
    • , K. E. RehmAffiliated withPhysics Division, Argonne National Laboratory
    • , D. SewerinyakAffiliated withPhysics Division, Argonne National Laboratory
    • , X. D. TangAffiliated withUniversity of Notre Dame
    • , C. UgaldeAffiliated withPhysics Division, Argonne National LaboratoryUniversity of Chicago
    • , S. ZhuAffiliated withPhysics Division, Argonne National Laboratory

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Abstract

The fusion excitation function of 60 Ni + 100 Mo has been measured from above the Coulomb barrier down to a cross section around 2 μb, looking for coupling and hindrance effects in this soft medium-mass system with positive Q-values for several neutron transfer channels. A comparison is made with previous results for 64 Ni + 100 Mo where no Q > 0 transfer channels exist and the hindrance effect is quite clear. The two excitation functions are very similar, as well as the corresponding logarithmic derivatives showing analogous saturations below the barrier. It appears that transfer couplings to Q > 0 channels seem to play a marginal role near and below the barrier for 60 Ni + 100 Mo , even if measurements of cross sections lower than 1 μb would be needed also for this system. Coupled-channels calculations confirm these observations and indicate that multi-phonon excitations dominate the fusion dynamics in the whole measured energy range.