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

6 Jun 2018, 10:45
18m
Kunibiki Messe (Matsue)

Kunibiki Messe

Matsue

Oral contribution Session 10

Speaker

Dr Choi Ki-Seok (Department of phyiscs, Soongsil Univ.)

Description

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 \textcolor[rgb]{0.98,0.00,0.00}{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 Wood-Saxon type potential with the global Aky\"uz-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.

Primary author

Dr Choi Ki-Seok (Department of phyiscs, Soongsil Univ.)

Co-authors

Prof. Cheoun Myung-Ki (Department of physics, Soongsil Univ.) Prof. Kim K.S. (Korea Aerospace University) Dr Kouichi Hagino (Department of Physics, Tohoku University) Prof. So W.Y. (Kangwon National University)

Presentation Materials