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t+t clustering states in He isotopes are investigated by using two theoretical approaches. We obtained many t+t resonances near to the t+t threshold with a RGM type approach. Further, a role of the t+t cluster component in the ground state is examined with AMD triple-S, allowing the wider configuration space containing simultaneously the “t+t+valence neutrons” structure and “4He+valence neutrons” structure. We understand the importance of the t+t component even for the ground state. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

A new method for calculating the low-lying states of light nuclei is proposed: Antisymmetrized Molecular Dynamics (AMD) — Superposition of Selected Snapshots (AMD triple-S). In addition to the cluster features of the core nucleus, the properties of the wave of valence nucleons are well expressed in terms of a superposition of selected AMD wave functions. For 6He, the binding energy and the halo nature are reproduced using effective interactions determined from a phase-shift analysis. For the deformed core cases, in 12Be, the newly observed J = 0 state at 2.24 MeV is analyzed to be the second 0+ state. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]