Short-range Correlations in Imbalanced Fermi Systems
The atomic nucleus is composed of two different kinds of fermions: protons and neutrons. If the protons and neutrons did not interact, the Pauli exclusion principle would force the majority fermions, usually neutrons, to a higher average momentum. In this talk, I will present results from high-energy electron scattering experiments, which show that the fermions with short-range interactions form correlated, high-momentum, neutron-proton pairs.
Thus, in neutron-rich nuclei the probability of finding high-momentum (k > kFermi) protons (the minority fermions) is greater than that of neutrons (the majority fermions). This has wide ranging implications for atomic, nuclear and astrophysics, including neutrino-nucleus scattering, the EMC effect, the NuTeV anomaly, the nuclear symmetry energy and more. This feature is universal for imbalanced two-component fermion systems and can also be observed experimentally in imbalanced two-spin states, such as ultra-cold atomic gas systems.