Investigation of 9Be from a nonlocalized clustering concept

The nonlocalized aspect of clustering, which is a new concept for self-conjugate nuclei, is extended for the investigation of the N ≠Z nucleus ⁹Be. A modified version of the Tohsaki-Horiuchi-Schuck-Röpke (THSR) wave function is introduced with a new phase factor. It is found that the constructed negative-parity THSR wave function is very suitable for describing the cluster states of ⁹Be. Namely, the nonlocalized clustering is shown to prevail in ⁹Be. The calculated binding energy and radius of ⁹Be are consistent with calculations in other models and with experimental values. The squared overlaps between the single THSR wave function and the Brink + generator coordinate method wave function for the 3 /2^- rotational band of ⁹Be are found to be near 96%. Furthermore, by showing the density distribution of the ground state of ⁹Be, the π -orbit structure is naturally reproduced by using this THSR wave function.