Analysis of the unbound spectrum of $^{12}$Li
arXiv:1012.2303 · doi:10.1016/j.nuclphysa.2010.12.003
Abstract
The unbound nucleus $^{12}$Li is evaluated by studying three-neutron one-proton excitations within the multistep shell model in the complex energy plane. It is found that the ground state of this system consists of an antibound $2^-$ state. A number of narrow states at low energy are found which ensue from the coupling of resonances in $^{11}$Li to continuum states close to threshold.
24 pages, 7 figures, 2 tables