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26 April 2024

» arxiv » nucl-ex/0412043

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Hindrance of Heavy-ion Fusion at Extreme Sub-Barrier Energies in Open-shell Colliding Systems
C. L. Jiang ; K. E. Rehm ; H. Esbensen ; R. V. F. Janssens ; B. B. Back ; P. Collon ; C. N. Davids ; J. P. Greene ; D. J. Henderson ; C. J. Lister ; S. Kurtz ; R. C. Pardo ; T. Pennington ; M. Paul ; D. Peterson ; D. Seweryniak ; B. Shumard ; S. Sinha ; X. D. Tang ; I. Tanihata ; S. Zhu ;
Date:	20 Dec 2004
Journal:	Phys.Rev. C71 (2005) 044613
Subject:	nucl-ex
Abstract:	The excitation function for the fusion-evaporation reaction 64Ni+100Mo has been measured down to a cross-section of ~5 nb. Extensive coupled-channels calculations have been performed, which cannot reproduce the steep fall-off of the excitation function at extreme sub-barrier energies. Thus, this system exhibits a hindrance for fusion, a phenomenon that has been discovered only recently. In the S-factor representation introduced to quantify the hindrance, a maximum is observed at E_s=120.6 MeV, which corresponds to 90% of the reference energy E_s^ref, a value expected from systematics of closed-shell systems. A systematic analysis of Ni-induced fusion reactions leading to compound nuclei with mass A=100-200 is presented in order to explore a possible dependence of the fusion hindrance on nuclear structure.
Source:	arXiv, nucl-ex/0412043
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