Recognition: unknown
Analysis of the unbound spectrum of ¹²Li
classification
⚛️ nucl-th
keywords
energyfoundstatestatesunboundanalysisantiboundclose
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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.
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