We investigate properties of bound and resonance states in the $_{ \Lambda}^{ 9}$Be nucleus. To reveal the nature of these states, we use a three-cluster $2\alpha+\Lambda$ microscopic model. The model incorporates Gaussian and oscillator basis functions and reduces a three-cluster Schr\"{ o}dinger equation to a two-body like many-channel problem with the two-cluster subsystems ($_{ \Lambda}^{ 5}$He and $^8$Be) being in a bound or a pseudo-bound state. Influence of the cluster polarization on the energy and widths of resonance states in $_{ \Lambda}^{ 9}$Be and on elastic and inelastic $_{ \Lambda}^{ 5}$He+$\alpha$ scattering is analyzed.
Categories: nucl-th