Proton-neutron interactions in N \approx Z nuclei

Abstract

Proton-neutron (p-n) interactions and its various aspects in $N\approx Z$ nuclei of $g_{9/2}$- and $f_{7/2}$ subshell are studied using a schematic model interaction with four force parameters proposed recently. It is shown that the model interaction well reproduces observed physical quantities: the double differences of binding energies, symmetry energy, Wigner energy, odd-even mass difference and separation energy, which testifies the reliability of the model interaction and its p-n interactions. First of all, the double differences of binding energies are used for probing the p-n interactions. The analysis reveals different contributions of the isoscalar and isovector p-n pairing interactions to two types of double difference of binding energies, and also indicates the importance of a unique form of isoscalar p-n pairing force with all $J$ components. Next, it is shown that this p-n force is closely related to the symmetry energy and the Wigner energy. Other calculations demonstrate significant roles of p-n interactions in the odd-even mass difference and in the separation energy at $N=Z$.

36 pages, 11 figures, to be published Phys. Rev. C

References in corpus (4)

• Odd-Even Staggering of Nuclear Masses: Pairing or Shape Effect?
• The Origin of the Wigner Energy
• Pairing and the structure of the pf-shell N ~ Z nuclei
• Proton drip-line nuclei in relativistic mean-field theory

Cited by in corpus (17)

• Local Density Approximation for proton-neutron pairing correlations. I. Formalism
• Overview of Neutron-Proton Pairing
• Improvement of the extended P+QQ interaction by modifying the monopole field
• Pairing transition of nuclei at finite temperature
• Application of the extended P+QQ force model to $N\approx Z$ fp shell nuclei
• Different particle alignments in N \approx Z Ru isotopes studied by the shell model
• An Algebraic Pairing Model with Sp(4) Symmetry and its Deformation
• Competition between isoscalar and isovector pairing correlations in N=Z nuclei
• Proton-neutron pairing energies in N=Z nuclei at finite temperature
• Roles of proton-neutron interactions in alpha-like four-nucleon correlations
• Staggering behavior of 0^+ state energies in the Sp(4) pairing model
• Alpha decay and proton-neutron correlations
• Dynamical symmetry of isobaric analog 0+ states in medium mass nuclei
• Microscopic analysis of T=1 and T=0 proton-neutron correlations in $N=Z$ nuclei
• Shell gaps and pn pairing interaction in N = Z nuclei
• Generalized q-Deformed Symplectic sp(4) Algebra for Multi-shell Applications
• Anomalous behavior of the first excited 0${}^{+}$ state in $N\approx Z$ nuclei