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Fusion Hindrance and Quadrupole Collectivity in Collisions of A similar or equal to 50 Nuclei: The Case of Ti-48+Fe-58

M. Stefanini A. G. Montagnoli L. Corradi S. Courtin 1 D. Bourgin 1 E. Fioretto A. Goasduff 2 J. Grebosz F. Haas 1 M. Mazzocco T. Mijatovic D. Montanari C. Parascandolo F. Scarlassara E. Strano S. Szilner N. Toniolo D. Torresi
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : The fusion excitation function of Ti-48 + Fe-58 has been measured in a wide energy range around the Coulomb barrier, covering 6 orders of magnitude of the cross sections. We present here the preliminary results of this experiment, and a full comparison with the near-by system Ni-58 + Fe-54 where evidence of fusion hindrance shows up at relatively high cross sections. The sub-barrier cross sections of Ti-48 + Fe-58 are much larger than those of Ni-58 + Fe-54. Significant differences are also observed in the logarithmic derivatives, astrophysical S-factors and fusion barrier distributions. The influence of low-energy nuclear structure on all these trends is pointed out and commented. Coupled-channels calculations using a Woods-Saxon potential are able to reproduce the experimental results for Ti-48 + Fe-58. The logarithmic derivative of the excitation function is very nicely fit, and no evidence of hindrance is observed down to around 1 mu b. The fusion barrier distribution is rather wide, flat and structureless. It is only in qualitative agreement with the calculated distribution.
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Submitted on : Wednesday, May 6, 2015 - 11:24:48 AM
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M. Stefanini A., G. Montagnoli, L. Corradi, S. Courtin, D. Bourgin, et al.. Fusion Hindrance and Quadrupole Collectivity in Collisions of A similar or equal to 50 Nuclei: The Case of Ti-48+Fe-58. VI INTERNATIONAL CONFERENCE FUSION14, Feb 2014, New Delhi, India. pp.00057, ⟨10.1051/epjconf/20158600057⟩. ⟨in2p3-01149064⟩



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