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Novel cluster states in $^{10}$Be

Cluster structures of excited $^{10}$Be states are investigated with a hybrid model of dineutron condensate wave functions and $^6$He+$α$ cluster wave functions. Two kinds of cluster states are theoretically suggested a few MeV above the $α+α+n+n$ threshold energy. They have quite distinct cluster structure; ones have gas-like structures of $α+α$+dineutron, and the others have $^6$He+$α$ with extremely extended an $α$ cluster. Although these cluster states have not been confirmed experimentally yet, theoretically suggested properties of these states such as monopole transition strengths and $α$-decay widths may be helpful for possible experimental observation.