4$α$ linear-chain state produced by $^{9}$Be+$^{9}$Be collision

Extreme nuclear deformations provide great insight into the geometric formation of quantum many-body systems. In this work, the $4α+2n$ linear chain is assessed in $^{18}$O. We predict excitation energies, moment-of-inertia, $α$-, and $^{9}$Be-decay widths by using the antisymmetrized molecular dynamics. We show that the $K^π=3^-$ linear-chain states may be verified by the head-on $^{9}{\rm Be}+{}^{9}{\rm Be}$ collision experiments.

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