Description of He isotopes using the particle-particle random-phase approximation model
Abstract
The two-neutron RPA model has been used to describe helium isotopes with N (the neutron number) = 4, 6, 7, 8 in their ground and excited states. The properties of all these isotopes are given by a single system of equations so that their properties are interdependent. Since the ground states of 9He and 10He are still not well established, we have looked how the properties of 9He induce the properties of the other isotopes, energies and wave functions. Our results suggest an inversion of 2s-1p1/2 shells in 9He. The corresponding ground states of 9He and 10He are slightly unbound and respectively 1/2+ and 0+ states while the 1/2- and 0+ seen in experiments appear to be excited states. With this assumption on 9He, we get not only a nice picture of 10He but also a very good two-neutron separation energy in 8He.
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