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Calculation of the spectrum of 12Li by using the multistep shell model method in the complex energy plane
Z. X. Xu, R. J. Liotta, Chong Qi, T. Roger1, P. Roussel-Chomaz1, H. Savajols1, R. Wyss
(2010)

The unbound nucleus $^{12}$Li is evaluated by using the multistep shell model in the complex energy plane assuming that the spectrum is determined by the motion of three neutrons outside the $^9$Li core. It is found that the ground state of this system consists of an antibound $1/2^+$ state and that only this and a $1/2^-$ and a $5/2^+$ excited states are physically meaningful resonances.
1 :  GANIL - Grand Accélérateur National d'Ions Lourds
Physique/Physique Nucléaire Théorique
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1004.4083