Sub-barrier fusion hindrance in medium-light systems

✍ Scribed by G. Montagnoli; F. Scarlassara; P. Mason; A.M. Stefanini; R. Silvestri; L. Corradi; E. Fioretto; B. Guiot; S. Courtin; F. Haas; D. Lebhertz; S. Szilner

• Book ID: 103866694
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 522 KB
• Volume: 834
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2009.12.028

✦ Synopsis

The fusion excitation functions of 48 Ca + 48 Ca and 36 S + 64 Ni have been measured down to very low energies, where the phenomenon known as fusion "hindrance" should show up, extending previous measurements which were limited to rather large near-barrier cross sections. Both systems show a steady decrease of the sub-barrier fusion cross sections with no pronounced change of slope. The logarithmic slopes of the two fusion excitation functions have a steep rise in the barrier region with decreasing energy and then level off in both cases. A close analogy with the case of 36 S + 48 Ca, a system with a positive Q-value for fusion ( Q fus ), that was measured recently, is pointed out.