The nonlocalized aspect of clustering, which is a new concept for self-conjugate nuclei, is extended for the investigation of the N = Z nucleus 9 Be. A modified version of the THSR (TohsakiHoriuchi-Schuck-Röpke) 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 9 Be. Namely the nonlocalized clustering is shown to prevail in 9 Be. The calculated binding energy and radius of 9 Be are consistent with calculations in other models and with experimental values.The squared overlaps between the single THSR wave function and the Brink+GCM (Generator Coordinate Method) wave function for the 3/2 − rotational band of 9 Be are found to be near 96%.Furthermore, by showing the density distribution of the ground state of 9 Be, the π-orbit structure is naturally reproduced by using this THSR wave function.

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We extend the new concept of nonlocalized clustering to the nucleus 10 Be with proton number Z=4 and neutron number N=6 (N=Z+2). The Tohsaki-Horiuchi-Schuck-Röpke (THSR) wave function is formulated for the description of different structures of 10 Be. Physical properties such as energy spectrum and root-mean-square radii are calculated for the first two 0 + states and corresponding rotational bands. With only one single THSR wave function, the calculated results show good agreement with other models and experimental values. We apply, for the first time, the THSR wave function on the chain orbit (σ-orbit) structure in the 0 + 2 state of 10 Be. The ring orbit (π-orbit) and σ-orbit structures are further illustrated by calculating the density distribution of the valence neutrons. We also investigate the dynamics of α-clusters and the correlations of two valence neutrons in 10 Be.