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We investigate the multineutron excitations of neutron-rich $^8$He in theelectric dipole strength using a $^4$He+$n$+$n$+$n$+$n$ five-body model.Many-body unbound states of $^8$He are obtained in the complex scaling method.We found that the different excitation modes coexist in the dipole strengthbelow the excitation energy of 20 MeV. The strength below 10 MeV comes from the$^7$He+$n$ channel, indicating the sequential breakup of $^8$He via the $^7$Heresonance to $^6$He+$n$+$n$. Above 10 MeV, the strength is obtained frommany-body continuum states with strong configuration mixings, suggesting a newcollective motion of four neutrons with the dipole oscillation against $^4$He.

Modeling the electric dipole strength of neutron-rich $^8$He: Prediction of multineutron collective excitations