Quasideuterons in Light Nuclei

Abstract

The role of pairing correlations for nucleon pairs with isospin $T=1$ and $T=0$ is investigated for nuclei in the mass region $12\le A\le 42$. For that purpose the two-nucleon densities resulting from nuclear shell-model calculations in one and two major shells are analyzed. Significant effects on the resulting energies are observed due to the formation of $T=0$ pairs. The formation of quasi-deuterons is maximal for symmetric nuclei with $N=Z$. The formation of $T=0$ pairs is less sensitive to the density of single-particle states close to the Fermi energy than the $T=1$ pairing and is relevant also for excitations across shell-closures. This robustness also explains why $T=0$ pairing does not lead to such a clear evidence in comparing energies of neighbored nuclei as the "odd-even mass staggering" due to the formation of $T=1$ pairing.

arXiv comment8 pages, 5 figure

References in corpus (16)

• Pairing in nuclear systems: from neutron stars to finite nuclei
• Thick-Restart Block Lanczos Method for Large-Scale Shell-Model Calculations
• Overview of Neutron-Proton Pairing
• Pairing and Isospin Symmetry in Proton-Rich Nuclei
• Pairing and the structure of the pf-shell N ~ Z nuclei
• Is there np pairing in odd-odd N=Z nuclei?
• Mixed-Spin Pairing Condensates in Heavy Nuclei
• Model--space approach to ${}^1{S}_0$ neutron and proton pairing with the Bonn meson--exchange potentials
• Spin-triplet pairing in large nuclei
• Pairing properties of nucleonic matter employing dressed nucleons
• The structure of nuclear systems derived from low momentum nucleon-nucleon potentials
• Temperature Dependence of Pair Correlations in Nuclei in the Iron-Region
• Empirical pairing gaps and neutron-proton correlations
• In-medium bound states and pairing gap
• Neutron--proton spin--spin correlations in the ground states of N=Z nuclei
• Pairing in Nuclear Matter and Finite Nuclei