Abstract
Energy levels of the hypernucleus BeΛ10 within the framework of an α+α+Λ+n four-body cluster model are calculated. Interactions between the constituent subunits are determined so as to reproduce reasonably well the observed low-energy properties of the αα, αN, αΛ, ααΛ and ααN subsystems. Furthermore, the two-body ΛN interaction is adjusted so as to reproduce the 0+–1+ splitting of HΛ4. The Λ separation energies of positive parity states are smaller than those of negative parity states. As a result, there occurs level inversion between 0+, 11+ states and 3− and 22− states.
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