Abstract
A new concept of “atom-nucleus hybrid state” is proposed to explain the second 9ΣBe peak observed in the (K-, π-) reaction at CERN. The explanation is based on coupling among the isotriplet states of 8Be*(16.63 MeV) with corresponding isotriplet of Σ particles. The Coulomb interaction between 8B and Σ- prepares a shallow atomic bound state with a narrow conversion width. The coupling of strong interaction between the two states (8B + Σ-) and (8Be*+ Σ0) pushes down the energy of resonance state and it is expected to reproduce the correct energy position and level width of the second peak of the observed 9ΣBe hypernuclear spectrum.
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