Consequences of Heavy-Ion Fusion Hindrance on Explosive Astrophysical Processes.

Details Consequences of Heavy-Ion Fusion Hindrance on Explosive Astrophysical Processes. Consequences of Heavy-Ion Fusion Hindrance on Explosive Astrophysical Processes.

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..dnp.ee005b&link_type=abstract

American Physical Society, 2007 Annual Meeting of the Division of Nuclear Physics, October 10-13,2007, abstract #EE.005

Physics

Nuclear Physics

Scientific paper

Recent measurements of sub-barrier fusion of ^60Ni+^89Y[1], ^64Ni+^64Ni[2], ^64Ni+^100Mo[3], and ^28Si+^64Ni[4], as well as a re-analysis of older data from the literature, has unambiguously demonstrated that fusion cross sections at sub-barrier energies are substantially lower than predicted by present fusion models. Recently, it has been proposed that the additional compression energy inside the touching point of the fusing nuclei causes the observed fusion hindrance [5]. A close examination of published data on fusion reactions involving carbon and oxygen indicates that also these light systems are subject to the sub-barrier hindrance. This renders the standard extrapolations to the even lower energies, which come into play in explosive astrophysical processes, unreliable, and an extrapolation method, which is guided by the observed fusion hindrance, is therefore proposed [6]. This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. [1] C.L. Jiang et al., Phys. Rev. Lett. 89, 52701 (2002) [2] C.L. Jiang et al., Phys. Rev. Lett. 93, 12701 (2004) [3] C.L. Jiang et al., Phys. Rev. C 71, 44613 (2005) [4] C.L. Jiang et al., Phys. Lett. B640, 18 (2006) [5] S. Misicu and H. Esbensen, Phys. Rev. Lett. 96,112701 (2006) [6] C.L. Jiang et al., Phys. Rev. C 75, 015803 (2007)

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