Studies of Light Neutron-Excess Systems from Bounds to Continuum

Abstract

Abstract. The generalized two-center cluster model (GTCM), which can handle various single particle config urations in general two center systems, is applied to the light neutron-rich system, 12 Be= α+α+4N. We discuss the change of the neutrons' configuratio around two α-cores as a variation of an excitation energy. We show that the covalent, ionic and atomic configuration appear in the unbound region above the α+ 8 He g.s. particledecay threshold. The GTCM calculation is also applied to even Be isotopes, and the systematics on the structural changes from bound region to continuum is discussed.