Search

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]

With the core+n+n three-body cluster model, we investigated [supll]Li and [sup10]He. By using a [sup9]Li-n interaction which reproduce the degeneracy of single particle s [sub1/2]- and p[subl/2]-orbital states above the [sup 9]Li+n threshold, a low-lying excited resonance is predicted in [sup 11]Li together with the ground state, and they are found to be parmers in mixed configurations of (0p[sub 1/2]) and (lS[subl/2])[sup2]. The observed three-body resonance in [sup10]He is considered to be the two valence neutrons mainly in the p-orbit, (0P[subl/2])[sup 2]. In addition to a solution of the two valence neutrons in the p-orbit, we obtained a solution of the two valence neutrons mainly in the s-orbit, (1s [sub 1/2])[sup2], as the ground state. Experimentally, such a state has not yet been observed. This newly predicted state of [sup l0]He with the main component of (ls[sub l/2])[sup 2] would corresponds to the ground state of [sup ll]Li with a halo structure. [ABSTRACT FROM AUTHOR]