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Title: Transfer couplings and hindrance far below the barrier for 40 Ca + 96 Zr

The sub-barrier fusion excitation function of 40Ca + 96Zr has been measured down to cross sections ≃2.4µb, i.e. two orders of magnitude smaller than obtained in the previous experiment, where the sub-barrier fusion of this system was found to be greatly enhanced with respect to 40Ca + 90Zr, and the need of coupling to transfer channels was suggested. The purpose of this work was to investigate the behavior of 40Ca + 96Zr fusion far below the barrier. The smooth trend of the excitation function has been found to continue, and the logarithmic slope increases very slowly. No indication of hindrance shows up, and a comparison with 48Ca + 96Zr is very useful in this respect. A new CC analysis of the complete excitation function has been performed, including explicitly one- and two-nucleon Q >0 transfer channels. Such transfer couplings bring significant cross section enhancements, even at the level of a few µb. Locating the hindrance threshold, if any, in 40Ca + 96Zr would require challenging measurements of cross sections in the sub-µb range.
 [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [1] ;  [5] ;  [6] ;  [4] ;  [7] ;  [7] ;  [8] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [8] ;  [1] ;  [2]
  1. INFN, Laboratori Nazioali di Legnaro, Padova (Italy)
  2. Universita di Padova, and INFN, Padova (Italy)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Universite de Strasbourg, Cedex (France)
  5. Universite Paris-Sud, Orsay (France)
  6. Polish Academy of Sciences, Cracow (Poland). Inst. of Nuclear Physics.
  7. Università di Padova, and INFN, Padova (Italy)
  8. Ruder Boskovic Inst., Zagreb (Croatia)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 86; Journal ID: ISSN 2100-014X
EDP Sciences
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States