%0 Journal Article %T Clustering aspects and the shell model %A Akito Arima %J Physics %D 2004 %I arXiv %R 10.1016/j.nuclphysa.2004.04.030 %X In this talk I shall discuss the clustering aspect and the shell model. I shall first discuss the $\alpha$-cluster aspects based on the shell model calculations. Then I shall discuss the spin zero ground state dominance in the presence of random interactions and a new type of cluster structure for fermions in a single-$j$ shell in the presence of only pairing interaction with the largest multiplicity. %U http://arxiv.org/abs/nucl-th/0405078v1