Abstract
Structure of the ground and excited states in halo-like nuclei is discussed. Both the Borromean and tango halo types can be observed for n-p configurations of atomic nuclei.Structure of the halo may be different for the different levels and resonances in atomic nuclei. Isobar analog, double isobar analog, configuration, and double configuration states can simultaneously have n-n , n-p , and p-p halo components in their wave functions. When the halo structure of the excited state differs from that of the ground state, or the ground state has non-halo structure, the γ-transition from the excited state to the ground state can be essentially hindered, i.e. the formation of a specific type of isomers (halo isomers) becomes possible. B( Mγ ) and B( Eγ ) values for γ-transitions in 6,7,8 Li, 8,9,10 Be, 8,10,11 B, 10,11,12,13,14 C, 13,14,15,16,17 N, 15,16,17,19 O, and 17 F are analyzed. Special attention is given to nuclei which ground state does not exhibit halo structure but the excited state (halo isomer) may have one.
Highlights
Structure of the ground and excited states in halo-like nuclei is discussed. Both the Borromean and tango halo types can be observed for n-p configurations of atomic nuclei.Structure of the halo may be different for the different levels and resonances in atomic nuclei
Special attention is given to nuclei which ground state does not exhibit halo structure but the excited state may have one
Differences in halo structure of the excited and ground states can result in the formation of isomers
Summary
Structure of the ground and excited states in halo-like nuclei is discussed. Special attention is given to nuclei which ground state does not exhibit halo structure but the excited state (halo isomer) may have one. (twoneutron halo nucleus), i.e., the 3.56 MeV, J=0+ state of 6Li, has [5,6] a neutron-proton halo structure of Borromean type.
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