Decay dynamics of the unbound O 25 and O 26 nuclei

摘要: We study the ground and excited resonance states of $^{26}\mathrm{O}$ with a three-body model $^{24}\mathrm{O}+\phantom{\rule{0.16em}{0ex}}n+n$ taking into account coupling to continuum. To this end, we use new experimental data for invariant mass spectroscopy unbound $^{25}\mathrm{O}$ nuclei, present an update calculations two-neutron decay nucleus. With inputs determined ground-state $^{26}\mathrm{O}$, discuss dineutron correlations halo nature nucleus, as well structure states. For energy ${2}^{+}$ state, achieve excellent agreement calculation. show that state consists predominantly ${({d}_{3/2})}^{2}$ configuration, which pairing interaction between valence neutrons slightly decreases its from unperturbed one. also ${0}^{+}$ In particular, existence at 3.38 MeV, is mainly composed ${({f}_{7/2})}^{2}$ configuration.