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Charge symmetry breaking of the nucleon-nucleon interaction: ρ-ω mixing versus nucleon mass splitting
Phys. Rev. C 63, 034005 – Published 22 February, 2001
DOI: https://doi.org/10.1103/PhysRevC.63.034005
Abstract
We investigate three models for the charge symmetry breaking (CSB) of the nucleon-nucleon interaction (based upon mixing, nucleon mass splitting, and phenomenology) that all reproduce the empirical value for the CSB of the scattering length accurately. We reveal that these models make very different predictions for CSB in waves and examine the impact of this on some observable quantities of nuclear systems. It turns out that the binding energy difference is essentially ruled by and not very sensitive to CSB from P waves. However, the Coulomb displacement energies (which are the subject of the Nolen-Schiffer anomaly) receive about 50% of their CSB contribution from partial waves beyond Consequently, the predictions by the various CSB models differ here substantially (10%–20%). Unfortunately, the evaluation of the leading Coulomb contributions carries a large uncertainty such that no discrimination between the competing CSB models can presently be made. To decide the issue we suggest looking into nuclear few-body reactions that are sensitive to CSB of the nuclear force.
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