Coupled-channels analyses for 9,11 Li +  208 Pb fusion reactions with multi-neutron transfer couplings

Choi, Ki-Seok (School of Liberal Arts and Science, Korea Aerospace University, Koyang, 412-791, Republic of Korea) ; Cheoun, Myung-Ki (Department of Physics, OMEG Institute, Soongsil University, Seoul, 156-743, Republic of Korea) ; So, W.Y. (Department of Radiological Science, Kangwon National University at Dogye, Samcheok, 245-905, Republic of Korea) ; Hagino, K. (Department of Physics, Tohoku University, Sendai, 980-8578, Japan) (Research Center for Electron Photon Science, Tohoku University, 1-2-1 Mikamine, Sendai, 982-0826, Japan) ; Kim, K.S. (School of Liberal Arts and Science, Korea Aerospace University, Koyang, 412-791, Republic of Korea)

19 March 2018

Abstract: We discuss the role of two-neutron transfer processes in the fusion reaction of the 9,11 Li +  208 Pb systems. We first analyze the 9 Li +  208 Pb reaction by taking into account the coupling to the 7 Li +  210 Pb channel. To this end, we assume that two neutrons are directly transferred to a single effective channel in 210 Pb and solve the coupled-channels equations with the two channels. By adjusting the coupling strength and the effective Q -value, we successfully reproduce the experimental fusion cross sections for this system. We then analyze the 11 Li +  208 Pb reaction in a similar manner, that is, by taking into account three effective channels with 11 Li +  208 Pb, 9 Li +  210 Pb, and 7 Li +  212 Pb partitions. In order to take into account the halo structure of the 11 Li nucleus, we construct the potential between 11 Li and 208 Pb with a double folding procedure, while we employ a Woods–Saxon type potential with the global Akyüz–Winther parameters for the other channels. Our calculation indicates that the multiple two-neutron transfer process plays a crucial role in the 11 Li +  208 Pb fusion reaction at energies around the Coulomb barrier.

Published in: Physics letters B (2018)
Published by: Elsevier
DOI: 10.1016/j.physletb.2018.03.049
License: CC-BY-3.0

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