Λc+ and Λb hypernuclei

Abstract

Λc+ and Λb hypernuclei are studied in the quark-meson coupling (QMC) model. Comparisons are made with the results for Λ hypernuclei studied in the same model previously. Although the scalar and vector potentials felt by the Λ, Λc+, and Λb in the corresponding hypernuclei multiplet which has the same baryon numbers are quite similar, the wave functions obtained, e.g., for the 1s1/2 state, are very different. The Λc+ baryon density distribution in Λc+209Pb is much more pushed away from the center than that for the Λ in Λ209Pb due to the Coulomb force. On the contrary, the Λb baryon density distributions in Λb hypernuclei are much larger near the origin than those for the Λ in the corresponding Λ hypernuclei due to its heavy mass. It is also found that level spacing for the Λb single-particle energies is much smaller than that for the Λ and Λc+.