The isospin and neutron-to-proton excess dependence of short-range correlations

Abstract

We provide a systematic study of the isospin composition and neutron-to-proton $\left(\frac{N}{Z}\right)$ ratio dependence of nuclear short-range correlations (SRC) across the nuclear mass table. We use the low-order correlation operator approximation (LCA) to compute the SRC contribution to the single-nucleon momentum distributions for 14 different nuclei from $A=4$ to $A=208$. Ten asymmetric nuclei are included for which the neutrons outnumber the protons by a factor of up to 1.54. The computed momentum distributions are used to extract the pair composition of the SRC. We find that there is a comprehensive picture for the isospin composition of SRC and their evolution with nucleon momentum. We also compute the non-relativistic kinetic energy of neutrons and protons and its evolution with nuclear mass $A$ and $\frac{N}{Z}$. Confirming the conclusions from alternate studies it is shown that the minority species (protons) become increasingly more short-range correlated as the neutron-to-proton ratio increases. We forge connections between measured nucleon-knockout quantities sensitive to SRC and single-nucleon momentum distributions. It is shown that the LCA can account for the observed trends in the data, like the fact that in neutron-rich nuclei the protons are responsible for an unexpectedly large fraction of the high-momentum components.

arXiv comment8 pages, 7 figures

References in corpus (30)

• Quantum Monte Carlo methods for nuclear physics
• Self-consistent Green's function method for nuclei and nuclear matter
• Probing Cold Dense Nuclear Matter
• Nucleon-Nucleon Correlations, Short-lived Excitations, and the Quarks Within
• Momentum sharing in imbalanced Fermi systems
• Evidence for the Strong Dominance of Proton-Neutron Correlations in Nuclei
• Tensor Forces and the Ground-State Structure of Nuclei
• Nucleon and nucleon-pair momentum distributions in A <= 12 nuclei
• Investigation of Proton-Proton Short-Range Correlations via the 12C(e,e'pp) Reaction
• Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the 4He(e,e'pN) Triple-Coincidence Reaction
• Correlations in Hot Asymmetric Nuclear Matter
• Density and isospin asymmetry dependence of high-momentum components
• The nuclear contacts and short range correlations in nuclei
• Depletion of the nuclear Fermi sea
• Variational calculation of the ground state of closed-shell nuclei up to $A=40$
• Universality of short-range nucleon-nucleon correlations
• New Properties of High Momentum Distribution of Nucleons in Asymmetric Nuclei
• Electroinduced two-nucleon knockout and correlations in nuclei
• The center of mass motion of short-range correlated nucleon pairs studied via the A(e,e'pp) reaction
• Influence of short-range correlations in neutrino-nucleus scattering
• Extracting the Mass Dependence and Quantum Numbers of Short-Range Correlated Pairs from A(e,e'p) and A(e,e'pp) Scattering
• Stylized features of single-nucleon momentum distributions
• Photoinduced two-proton knockout and ground-state correlations in nuclei
• High-momentum tails from low-momentum effective theories
• Universality of nucleon-nucleon short-range correlations: the factorization property of the nuclear wave function, the relative and center-of-mass momentum distributions, and the nuclear contacts
• Factorization of exclusive electroinduced two-nucleon knockout
• Final-state interactions in two-nucleon knockout reactions
• Multi-Nucleon Short-Range Correlation Model for Nuclear Spectral Functions: I. Theoretical Framework
• Mass dependence and isospin dependence of short-range correlated pairs
• Probing short-range correlations in asymmetric nuclei with quasi-free pair knockout reactions

Cited by in corpus (11)

• Towards Understanding Astrophysical Effects of Nuclear Symmetry Energy
• Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei
• Short-range correlation physics at low RG resolution
• Nucleon-nucleon correlations and the single-particle strength in atomic nuclei
• High-momentum components in the ${}^4$He nucleus caused by inter-nucleon correlations
• Isospin composition of the high-momentum fluctuations in nuclei from asymptotic momentum distributions
• Novel observation of isospin structure of short-range correlations in calcium isotopes
• Phase-space distributions of nuclear short-range correlations
• Measurement of the beam-helicity asymmetry in photoproduction of ${\pi }^0\eta$ pairs on carbon, aluminum, and lead
• Predicted Measurements of the Tensor-to-Scalar Transition in the CLAS12 Nuclear Targets Experiment
• Impact of new results from the ultraperipheral collision on modeling the proton and neutron emission in photon-induced nuclear processes