Nature of resonance states in the 9Be and 9B mirror nuclei

The spectra of low-lying states of the Be-9 and B-9 mirror nuclei in the excitation-energy range between 0 and 5 MeV are considered within the microscopic alpha + alpha + n(p) three-cluster model, which is a three-cluster variant of the algebraic version of the resonating-group method. Attention is given primarily to studying the nature of resonance states in a three-cluster continuum. A detailed comparison of the results obtained in this way with experimental data and with results of other microscopic calculations is performed.