Deep Sub-Barrier Fusion Enhancement in the ⁶He+²⁰⁶Pb Reaction

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Yu. E. Penionzhkevich, V. I. Zagrebaev, S. M. Lukyanov, and R. Kalpakchieva
Flerov Laboratory of Nuclear Reaction, JINR, Dubna, Moscow Region, Russia

Received 13 January 2006; published 28 April 2006

Thefusion of ⁶He with ²⁰⁶Pb has been studied at energiesclose to and below the Coulomb barrier. The experiment wascarried out at the Dubna Radioactive Ion Beams complex ofFLNR, JINR. The ⁶He beam intensity was about 5×10⁶ pps, themaximum energy being 60.3±0.4 MeV. The yield of the ²¹⁰Po isotope,produced in the 2n-evaporation channel, demonstrates an extremely large enhancementof the sub-barrier fusion cross section as compared with the⁴He+²⁰⁸Pb reaction. This enhancement is most likely due to themechanism of "sequential fusion" with an intermediate neutron transfer from⁶He to the Pb nucleus with positive Q values.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.96.162701
DOI:	10.1103/PhysRevLett.96.162701
PACS:	25.60.Pj; 21.10.Gv; 24.10.Eq; 25.60.Je 25.60.Pj Unstable nucleus induced fusion reactions 21.10.Gv Nuclear mass and neutron distributions 24.10.Eq Coupled-channel and distorted-wave models of nuclei 25.60.Je Unstable nucleus induced transfer reactions YEAR: 2006
KEYWORDS:	heavy ion fusion reactions, nuclei with mass number 190 to 219

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