Charge symmetry breaking effect in mirror Λ hypernuclei with Skyrme-Hartree-Fock model 后印本

摘要: The charge symmetry breaking (CSB) effect in mirror hypernuclei is investigated within the framework of deformed Skyrme-Hartree-Fock (DSHF) theory. A phenomenological CSB term is introduced into the Skyrme type ΛN interaction SLL4, with its strength parameter determined by fitting experimental data from six pairs of mirror hypernuclei. Calculations are performed for hypernuclei spanning the mass range of A = 7 ∼ 40. The inclusion of the CSB term substantially reduces the discrepancy between the calculated Λ binding energy in mirror hypernuclei and the corresponding experimental values. Furthermore, the role of nuclear deformation in the hyperon binding energy and its differences in mirror hypernuclear systems is examined. Deformation exerts a considerable influence on the absolute hyperon binding energy in deformed hypernuclei. However, due to the cancellation that deformation effects are largely offset when computing the separation energy differences in mirror hypernuclei, its effect on the binding energy differences between mirror hypernuclei is found to be legligible.