Density dependence of charge symmetry breaking

C. J. Horowitz, J. Piekarewicz

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We study the density dependence of charge symmetry breaking by calculating the energy difference as a function of density between adding one neutron or one proton to uniform nuclear matter. Isospin violation from electromagnetic interactions are expected to increase with density as the average distance between quarks decreases. In contrast, isospin violation from the up-down quark mass difference should decrease with density as the contributions from the small quark masses are suppressed by the increasing Fermi momentum. The Okamoto-Nolen-Schiffer (ONS) anomaly in the binding energy of mirror nuclei was studied at high density by adding a single neutron or a proton to a quark-gluon plasma. In the limit of very high density we find an anomaly equal to two-thirds of the Coulomb exchange energy of a proton. This effect is dominated by quark electromagnetic interactions - rather than by the up-down quark mass difference, and has the same sign as that observed in normal nuclei.

Original languageEnglish
Article number011303
Pages (from-to)113031-113034
Number of pages4
JournalPhysical Review C - Nuclear Physics
Issue number1
StatePublished - Jan 2001
Externally publishedYes


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